- Como crear un grupo de programas

Muy útil para crear instalaciones por ejemplo:

Añadir un textbox y hacerlo oculto.
Una vez oculto, escribir estas líneas sustituyendo "Nombre del Grupo" por que que se desea crear,
y que lo colocamos en Inicio -> Programas.

Private Sub Command1_Click()
    Text1.LinkTopic = "Progman|Progman"
    Text1.LinkMode = 2
    Text1.LinkExecute "[CreateGroup(" + "Nombre del Grupo" + ")]"
End Sub

- Vaciar la carpeta de Documentos de Windows


Inicie un nuevo proyecto y añada el siguiente código:

Private Declare Function SHAddToRecentDocs Lib "Shell32" 
(ByVal lFlags As Long, ByVal lPv As Long) As Long

Private Sub Form_Load()
    SHAddToRecentDocs 0, 0
End Sub

- Abrir la ventana de Propiedades de agregar o quitar aplicaciones

Añada el siguiente código:

Private Sub Command1_Click()
X = Shell("Rundll32.exe shell32.dll,Control_RunDLL appwiz.cpl @0")
End Sub

- Uso de Random

La función Rnd o Random posee la virtud de obtener números aleatorios entre 0 y 1:

El único inconveniente a la hora de usar Rnd, es que hay que inicializarlo, en otro caso,
el resultado de la función Rnd, será siempre el mismo dentro de un determinado ordenador.
Por ejemplo, el código:

Private Sub Form_Load()
  Dim Num As Double
  Num = Rnd
  MsgBox Num
End Sub

Nos daría como resultado siempre el mismo número.

Para solucionar este problema, debemos escribir la sentencia Randomize antes de llamar
a la función Rnd. De esta manera, la función Rnd actuará correctamente.

El código quedaría así:

Private Sub Form_Load()
  Dim Num As Double
  Randomize
  Num = Rnd
  MsgBox Num
End Sub

- Calcular la etiqueta o label de un disco duro

Hallar la etiqueta o label del mismo disco duro:

Escribir el siguiente código:

Private Declare Function GetVolumeInformation& Lib "kernel32" Alias 
"GetVolumeInformationA" (ByVal lpRootPathName As String, 
ByVal pVolumeNameBuffer As String, ByVal nVolumeNameSize As Long, 
lpVolumeSerialNumber As Long, lpMaximumComponentLength As Long, 
lpFileSystemFlags As Long, ByVal lpFileSystemNameBuffer As String, 
ByVal nFileSystemNameSize As Long)

Private Sub Form_Load()
  Dim cad1 As String * 256
  Dim cad2 As String * 256
  Dim numSerie As Long
  Dim longitud As Long
  Dim flag As Long
  unidad = "D:\"
  Call GetVolumeInformation(unidad, cad1, 256, numSerie, longitud, 
  flag, cad2, 256)
  MsgBox "Label de la unidad " & unidad & " = " & cad1
End Sub

- Imprimir un RichTextBox tal y como se ve

Imprimir un RichTextBox con su formato original.

Private Sub Command1_Click()
On Error GoTo ErrorDeImpresion
Printer.Print ""
RichTextBox1.SelPrint Printer.hDC
Printer.EndDoc
Exit Sub
ErrorDeImpresion:
Exit Sub
End Sub

Otra forma:

En el Formulario [Form1 por defecto] :
Private Sub Form_Load() 
     Dim LineWidth As Long
     Me.Caption = "Rich Text Box Ejemplo de Impresion"
     Command1.Move 10, 10, 600, 380
     Command1.Caption = "&Imprimir"
     RichTextBox1.SelFontName = "Verdana, Tahoma, Arial"
     RichTextBox1.SelFontSize = 10
     LineWidth = WYSIWYG_RTF(RichTextBox1, 1440, 1440)
     Me.Width = LineWidth + 200
End Sub 

Private Sub Form_Resize() 
     RichTextBox1.Move 100, 500, Me.ScaleWidth - 200, Me.ScaleHeight - 600
End Sub 

Private Sub Command1_Click() 
     PrintRTF RichTextBox1, 1440, 1440, 1440, 1440
End Sub 

Crear un módulo y escribir:

Private Type Rect
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type

Private Type CharRange
cpMin As Long
cpMax As Long
End Type

Private Type FormatRange
hdc As Long
hdcTarget As Long
rc As Rect
rcPage As Rect
chrg As CharRange
End Type

Private Const WM_USER As Long = &H400
Private Const EM_FORMATRANGE As Long = WM_USER + 57
Private Const EM_SETTARGETDEVICE As Long = WM_USER + 72
Private Const PHYSICALOFFSETX As Long = 112
Private Const PHYSICALOFFSETY As Long = 113
Private Declare Function GetDeviceCaps Lib "gdi32" ( _
ByVal hdc As Long, ByVal nIndex As Long) As Long
Private Declare Function SendMessage Lib "USER32" Alias "SendMessageA" _
(ByVal hWnd As Long, ByVal msg As Long, ByVal wp As Long, lp As Any) As Long
Private Declare Function CreateDC Lib "gdi32" Alias "CreateDCA" _
(ByVal lpDriverName As String, ByVal lpDeviceName As String, _
ByVal lpOutput As Long, ByVal lpInitData As Long) As Long

Public Function WYSIWYG_RTF(RTF As RichTextBox, LeftMarginWidth As Long, _
RightMarginWidth As Long) As Long
Dim LeftOffset As Long, LeftMargin As Long, RightMargin As Long
Dim LineWidth As Long
Dim PrinterhDC As Long
Dim r As Long
Printer.Print Space(1)
Printer.ScaleMode = vbTwips
LeftOffset = Printer.ScaleX(GetDeviceCaps(Printer.hdc, _
PHYSICALOFFSETX), vbPixels, vbTwips)
LeftMargin = LeftMarginWidth - LeftOffset
RightMargin = (Printer.Width - RightMarginWidth) - LeftOffset
LineWidth = RightMargin - LeftMargin
PrinterhDC = CreateDC(Printer.DriverName, Printer.DeviceName, 0, 0)
r = SendMessage(RTF.hWnd, EM_SETTARGETDEVICE, PrinterhDC, _
ByVal LineWidth)
Printer.KillDoc
WYSIWYG_RTF = LineWidth
End Function

Public Sub PrintRTF(RTF As RichTextBox, LeftMarginWidth As Long, _
TopMarginHeight, RightMarginWidth, BottomMarginHeight)
Dim LeftOffset As Long, TopOffset As Long
Dim LeftMargin As Long, TopMargin As Long
Dim RightMargin As Long, BottomMargin As Long
Dim fr As FormatRange
Dim rcDrawTo As Rect
Dim rcPage As Rect
Dim TextLength As Long
Dim NextCharPosition As Long
Dim r As Long
Printer.Print Space(1)
Printer.ScaleMode = vbTwips
LeftOffset = Printer.ScaleX(GetDeviceCaps(Printer.hdc, _
PHYSICALOFFSETX), vbPixels, vbTwips)
TopOffset = Printer.ScaleY(GetDeviceCaps(Printer.hdc, _
PHYSICALOFFSETY), vbPixels, vbTwips)
LeftMargin = LeftMarginWidth - LeftOffset
TopMargin = TopMarginHeight - TopOffset
RightMargin = (Printer.Width - RightMarginWidth) - LeftOffset
BottomMargin = (Printer.Height - BottomMarginHeight) - TopOffset
rcPage.Left = 0
rcPage.Top = 0
rcPage.Right = Printer.ScaleWidth
rcPage.Bottom = Printer.ScaleHeight
rcDrawTo.Left = LeftMargin
rcDrawTo.Top = TopMargin
rcDrawTo.Right = RightMargin
rcDrawTo.Bottom = BottomMargin
fr.hdc = Printer.hdc
fr.hdcTarget = Printer.hdc
fr.rc = rcDrawTo
fr.rcPage = rcPage
fr.chrg.cpMin = 0
fr.chrg.cpMax = -1
TextLength = Len(RTF.Text)
Do
NextCharPosition = SendMessage(RTF.hWnd, EM_FORMATRANGE, True, fr)
If NextCharPosition >= TextLength Then Exit Do
fr.chrg.cpMin = NextCharPosition
Printer.NewPage
Printer.Print Space(1)
fr.hDC = Printer.hDC
fr.hDCTarget = Printer.hDC
Loop
Printer.EndDoc
r = SendMessage(RTF.hWnd, EM_FORMATRANGE, False, ByVal CLng(0))
End Sub

- Como obtener el directorio desde donde estamos ejecutando nuestro programa

Escribir el siguiente código:

Private Sub Form_Load()
Dim Directorio as String
ChDir App.Path
ChDrive App.Path
Directorio = App.Path
If Len(Directorio) > 3 Then
Directorio = Directorio & "\"
End If
End Sub

- Determinar si un fichero existe o no

Escriba el siguiente código: (una de tanta maneras aparte de Dir$())

Private Sub Form_Load()
On Error GoTo Fallo
x = GetAttr("C:\Autoexec.bat")
MsgBox "El fichero existe."
Exit Sub
Fallo:
MsgBox "El fichero no existe."
End Sub

- Capturar la pantalla entera o la ventana activa

Añadir dos botones y escribir el siguiente código:

Private Declare Sub keybd_event Lib "user32" (ByVal bVk As Byte,
ByVal bScan As Byte, ByVal dwFlags As Long,
ByVal dwExtraInfo As Long)

Private Sub Command1_Click()
'Captura la ventana activa
keybd_event 44, 0, 0&, 0&
End Sub

Private Sub Command2_Click()
'Captura toda la pantalla
keybd_event 44, 1, 0&, 0&
End Sub

- Salvar el contenido de un TextBox a un fichero en disco

Añada el siguiente código:

Private Sub Command1_Click()
Dim canalLibre As Integer
'Obtenemos un canal libre que nos dará
'el sistema oparativo para poder operar
canalLibre = FreeFile
'Abrimos el fichero en el canal dado
Open "C:\fichero.txt" For Output As #canalLibre
'Escribimos el contenido del TextBox al fichero
Print #canalLibre, Text1
Close #canalLibre
End Sub

- Como desplegar la lista de un ComboBox automáticamente

Insertar un ComboBox y un Botón en un nuevo proyecto y escribir el siguiente código:

Private Declare Function SendMessageLong Lib "user32" Alias
"SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long,
ByVal wParam As Long, ByVal lParam As Long) As Long

Private Sub Form_Load()
Combo1.Clear
Combo1.AddItem "Objeto 1"
Combo1.AddItem "Objeto 2"
Combo1.AddItem "Objeto 3"
Combo1.AddItem "Objeto 4"
Combo1.AddItem "Objeto 5"
Combo1.AddItem "Objeto 6"
Combo1.AddItem "Objeto 7"
Combo1.Text = "Objeto 1"
End Sub

Private Sub Command1_Click()
'ComboBox desplegado
Dim Resp As Long
Resp = SendMessageLong(Combo1.hwnd, &H14F, True, 0)
End Sub

Nota: Resp = SendMessageLong(Combo1.hwnd, &H14F, False, 0) oculta la lista desplegada
de un ComboBox, aunque esto sucede también cuando cambiamos el focus a otro control o al formulario.

- Selección y eliminación de todos los elementos de un ListBox

Insertar un ListBox y dos Botón en un nuevo proyecto. Poner la propiedad MultiSelect del ListBox
a "1 - Simple" y escriba el siguiente código:

Private Declare Function SendMessageLong Lib "user32" Alias
"SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long,
ByVal wParam As Long, ByVal lParam As Long) As Long

Private Sub Form_Load()
List1.AddItem "Texto 1"
List1.AddItem "Texto 2"
List1.AddItem "Texto 3"
List1.AddItem "Texto 4"
List1.AddItem "Texto 5"
List1.AddItem "Texto 6"
List1.AddItem "Texto 7"
End Sub

Private Sub Command1_Click()
'Seleccion de todo el contenido
Dim Resp As Long
Resp = SendMessageLong(List1.hwnd, &H185&, True, -1)
End Sub

Private Sub Command2_Click()
'Eliminacion de todos los elementos seleccionados
Dim Resp As Long
Resp = SendMessageLong(List1.hwnd, &H185&, False, -1)
End Sub

- Calcular el tamaño de fuentes de letra

Es útil para utilizar con la propiedad Resize sobre los controles al cambiar de resolución de pantalla.
Escribir el siguiente código:

Private Declare Function GetDeviceCaps Lib "gdi32" (ByVal
hdc As Long, ByVal nIndex As Long) As Long
Private Declare Function GetDC Lib "user32" (ByVal hwnd
As Long) As Long
Private Declare Function GetDesktopWindow Lib "user32" ()
As Long

Private Sub Form_Load()
Dim ObCaps As Long
Dim ObDC As Long
Dim ObDesktop As Long
Dim Cad As String
ObDesktop = GetDesktopWindow()
ObDC = GetDC(ObDesktop)
ObCaps = GetDeviceCaps(ObDC, 88)
If ObCaps = 96 Then Cad = "Pequeñas
If ObCaps = 120 Then Cad = "Grandes"
MsgBox "Fuentes de letra " & Cad
End Sub

*) Esta función ha sido corregida por un error en las etiquetas, 96 corresponde a pequeñas
y 120 a Grandes, agradecimientos a Andrés Moral Gutiérrez por su correción (01/06/1998)

- Provocar la trasparencia de un formulario

Escribir el siguiente código:

Private Declare Function SetWindowLong Lib "user32" Alias
"SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long,
ByVal dwNewLong As Long) As Long

Private Sub Form_Load()
Dim Resp As Long
Resp = SetWindowLong(Me.hwnd, -20, &H20&)
Form1.Refresh
End Sub

- Pasar de un TextBox a otro al pulsar Enter

Insertar tres TextBox y escribir el siguiente código:

Private Sub Text1_KeyPress(KeyAscii As Integer)
If KeyAscii = 13 Then
SendKeys "{tab}"
KeyAscii = 0
End If
End Sub

Private Sub Text2_KeyPress(KeyAscii As Integer)
If KeyAscii = 13 Then
SendKeys "{tab}"
KeyAscii = 0
End If
End Sub

Private Sub Text3_KeyPress(KeyAscii As Integer)
If KeyAscii = 13 Then
SendKeys "{tab}"
KeyAscii = 0
End If
End Sub

otra forma:

Insertar tres TextBox, cambiar la propiedad KeyPreview del formulario a True y escribir el siguiente código:

Private Sub Form_KeyPress(KeyAscii As Integer)
If KeyAscii = 13 Then
SendKeys "{tab}"
KeyAscii = 0
End If
End Sub

- Usar IF THEN ELSE ENDIF en una misma línea


Insertar un CommandButton y un TextBox y escribir el siguiente código:

Private Sub Command1_Click()
Dim I As Integer
Dim A As String
I = 3
A = IIf(I <> 1, "True", "False")
Text1.Text = A
End Sub

- Convertir un texto a mayúsculas o minúsculas

Crear un formulario y situar un TextBox. Escribir:

Private Sub Text1_Change()
Dim I As Integer
Text1.Text = UCase(Text1.Text)
I = Len(Text1.Text)
Text1.SelStart = I
End Sub

- Presentar la ventana AboutBox (Acerca de) por defecto

Escribir el siguiente código en el formulario:

Private Declare Function ShellAbout Lib "shell32.dll" Alias
"ShellAboutA" (ByVal hwnd As Long, ByVal szApp As String,
ByVal szOtherStuff As String, ByVal hIcon As Long) As Long

Private Sub Command1_Click()
Call ShellAbout(Me.hwnd, "Título Programa", "Copyright 1997, Dueño de la aplicación", Me.Icon)
End Sub

Incrementar un menú en ejecución

Abrir un proyecto nuevo, y haga doble click sobre el formulario. Meidante el gestór de menús
escribir lo siguiente:

Caption -> Editor
Name -> MnuEditor
Pulse Insertar y el botón "->"
Caption -> Añadir
Name -> MnuAñadir
Pulse Insertar
Caption -> Quitar
Name -> MnuQuitar
Enabled -> False
Pulse Insertar
Caption -> Salir
Name -> MnuSalir
Pulse Insertar
Caption -> -
Name -> MnuIndex
Index -> 0
Pulse Aceptar

Escribir el siguiente código en el formulario:

Private ultElem As Integer

Private Sub Form_Load()
ultElem = 0
End Sub

Private Sub MnuQuitar_Click()
Unload MnuIndex(ultElem)
ultElem = ultElem - 1
If ultElem = 0 Then
MnuQuitar.Enabled = False
End If
End Sub

Private Sub MnuSalir_Click()
End
End Sub

Private Sub MnuAñadir_Click()
ultElem = ultElem + 1
Load MnuIndex(ultElem)
MnuIndex(ultElem).Caption = "Menu -> " + Str(ultElem)
MnuQuitar.Enabled = True
End Sub

- Cambiar el fondo de Windows desde Visual Basic

Crear un formulario y escribir:

Private Declare Function SystemParametersInfo Lib "user32" Alias
"SystemParametersInfoA" (ByVal uAction As Long, ByVal uParam As
Long, ByVal lpvParam As Any, ByVal fuWinIni As Long) As Long

Private Sub Form_Load()
Dim fallo As Integer
fallo = SystemParametersInfo(20, 0, "C:\WINDOWS\FONDO.BMP", 0)
End Sub

- Calcular el número de colores de video del modo actual de Windows

Crear un formulario y un TextBox y escribir:

Private Declare Function GetDeviceCaps Lib "gdi32"
(ByVal hdc As Long, ByVal nIndex As Long) As Long

Private Sub Form_Load()
i = (2 ^ GetDeviceCaps(Form1.hdc, 12)) ^
GetDeviceCaps(Form1.hdc, 14)
Text1.Text = CStr(i) & " colores."
End Sub

- Ajustar un Bitmap a la pantalla

Crear un formulario con un BitMap cualquiera y una etiqueta o Label con los atributos que quiera.

Escribir lo siguiente:

Private Sub Form_Paint()
Dim i As Integer
For i = 0 To Form1.ScaleHeight Step Picture1.Height
For j = 0 To Form1.ScaleWidth Step Picture1.Width
PaintPicture Picture1, j, i, Picture1.Width,
Picture1.Height
Next
Next
End Sub

Private Sub Form_Resize()
Picture1.Left = -(Picture1.Width + 200)
Picture1.Top = -(Picture1.Height + 200)
Label1.Top = 100
Label1.Left = 100
End Sub

- Detectar la unidad del CD-ROM

Si para instalar una aplicación o ejecutar un determinado software necesitas saber si existe el CD-ROM:.

Crear un formulario con una etiqueta y escribir lo siguiente:

Option Explicit

Private Declare Function GetDriveType Lib "kernel32" Alias
"GetDriveTypeA" (ByVal nDrive As String) As Long
Private Declare Function GetLogicalDriveStrings Lib "kernel32" Alias
"GetLogicalDriveStringsA" (ByVal nBufferLength As Long, ByVal
lpBuffer As String) As Long
Private Const DRIVE_REMOVABLE = 2
Private Const DRIVE_FIXED = 3
Private Const DRIVE_REMOTE = 4
Private Const DRIVE_CDROM = 5
Private Const DRIVE_RAMDISK = 6

Function StripNulls(startStrg$) As String
Dim c%, item$
c% = 1
Do
If Mid$(startStrg$, c%, 1) = Chr$(0) Then
item$ = Mid$(startStrg$, 1, c% - 1)
startStrg$ = Mid$(startStrg$, c% + 1, Len(startStrg$))
StripNulls$ = item$
Exit Function
End If
c% = c% + 1
Loop
End Function

Private Sub Form_Load()
Dim r&, allDrives$, JustOneDrive$, pos%, DriveType&
Dim CDfound As Integer
allDrives$ = Space$(64)
r& = GetLogicalDriveStrings(Len(allDrives$), allDrives$)
allDrives$ = Left$(allDrives$, r&)
Do
pos% = InStr(allDrives$, Chr$(0))
If pos% Then
JustOneDrive$ = Left$(allDrives$, pos%)
allDrives$ = Mid$(allDrives$, pos% + 1, Len(allDrives$))
DriveType& = GetDriveType(JustOneDrive$)
If DriveType& = DRIVE_CDROM Then
CDfound% = True
Exit Do
End If
End If
Loop Until allDrives$ = "" Or DriveType& = DRIVE_CDROM
If CDfound% Then
label1.Caption = "La unidad de CD-ROM corresponde a la
unidad: " & UCase$(JustOneDrive$)
Else
label1.Caption = "Su sistema no posee CD-ROM o unidad
no encontrada."
End If
End Sub

- Calcular la profundidad de color (bits por pixel) y resolución de Windows

Crear un formulario y un TextBox y escribir:

Private Declare Function GetDeviceCaps Lib "gdi32"
(ByVal hdc As Long, ByVal nIndex As Long) As Long

Private Sub Form_Load()
Dim col, bit, largo, alto As Integer
col = GetDeviceCaps(Form1.hdc, 12)
If col = 1 Then
bit = GetDeviceCaps(Form1.hdc, 14)
If bit = 1 Then
Text1.Text = "Resolucion de 1 bit / 2 colores"
ElseIf bit = 4 Then
Text1.Text = "Resolucion de 4 bits / 16 colores"
End If
ElseIf col = 8 Then
Text1.Text = "Resolucion de 8 bits / 256 colores"
ElseIf col = 16 Then
Text1.Text = "Resolucion de 16 bits / 65000 colores"
Else
Text1.Text = "Resolucion de 16 M colores"
End If
largo = GetDeviceCaps(Form1.hdc, 8)
alto = GetDeviceCaps(Form1.hdc, 10)
Text1.Text = Text1.Text & " " & largo & "x" & alto & " pixels"
End Sub

- Comprobar si el sistema posee tarjeta de sonido

Crear un formulario y escribir:

Private Declare Function waveOutGetNumDevs Lib
"winmm.dll" () As Long

Private Sub Form_Load()
Dim inf As Integer
inf = waveOutGetNumDevs()
If inf > 0 Then
MsgBox "Tarjeta de sonido soportada.", vbInformation,
"Informacion: Tarjeta de sonido"
Else
MsgBox "Tarjeta de sonido no soportada.", vbInformation,
"Informacion: Tarjeta de sonido"
End If
End
End Sub

- Crear una ventana con la Información del Sistema

Crear un formulario e insertar un módulo y escribir en el formulario lo siguiente:

Private Sub Form_Load()
Dim msg As String
MousePointer = 11
Dim verinfo As OSVERSIONINFO
verinfo.dwOSVersionInfoSize = Len(verinfo)
ret% = GetVersionEx(verinfo)
If ret% = 0 Then
MsgBox "Error Obteniendo Information de la Version"
End
End If
Select Case verinfo.dwPlatformId
Case 0
msg = msg + "Windows 32s "
Case 1
msg = msg + "Windows 95 "
Case 2
msg = msg + "Windows NT "
End Select
ver_major$ = verinfo.dwMajorVersion
ver_minor$ = verinfo.dwMinorVersion
build$ = verinfo.dwBuildNumber
msg = msg + ver_major$ + "." + ver_minor$
msg = msg + " (Construido " + build$ + ")" + vbCrLf + vbCrLf
Dim sysinfo As SYSTEM_INFO
GetSystemInfo sysinfo
msg = msg + "CPU: "
Select Case sysinfo.dwProcessorType
Case PROCESSOR_INTEL_386
msg = msg + "Procesador Intel 386 o compatible." + vbCrLf
Case PROCESSOR_INTEL_486
msg = msg + "Procesador Intel 486 o compatible." + vbCrLf
Case PROCESSOR_INTEL_PENTIUM
msg = msg + "Procesador Intel Pentium o compatible." + vbCrLf
Case PROCESSOR_MIPS_R4000
msg = msg + "Procesador MIPS R4000." + vbCrLf
Case PROCESSOR_ALPHA_21064
msg = msg + "Procesador DEC Alpha 21064." + vbCrLf
Case Else
msg = msg + "Procesador (desconocido)." + vbCrLf
End Select
msg = msg + vbCrLf
Dim memsts As MEMORYSTATUS
Dim memory&
GlobalMemoryStatus memsts
memory& = memsts.dwTotalPhys
msg = msg + "Memoria Fisica Total: "
msg = msg + Format$(memory& \ 1024, "###,###,###") + "Kb" + vbCrLf
memory& = memsts.dwAvailPhys
msg = msg + "Memoria Fisica Disponible: "
msg = msg + Format$(memory& \ 1024, "###,###,###") + "Kb" + vbCrLf
memory& = memsts.dwTotalVirtual
msg = msg + "Memoria Virtual Total: "
msg = msg + Format$(memory& \ 1024, "###,###,###") + "Kb" + vbCrLf
memory& = memsts.dwAvailVirtual
msg = msg + "Memoria Virtual Disponible: "
msg = msg + Format$(memory& \ 1024, "###,###,###") + "Kb" + vbCrLf + vbCrLf
MsgBox msg, 0, "Acerca del Sistema"
MousePointer = 0
End
End Sub

Escribir lo siguiente en el módulo:

Type SYSTEM_INFO
dwOemID As Long
dwPageSize As Long
lpMinimumApplicationAddress As Long
lpMaximumApplicationAddress As Long
dwActiveProcessorMask As Long
dwNumberOrfProcessors As Long
dwProcessorType As Long
dwAllocationGranularity As Long
dwReserved As Long
End Type

Type OSVERSIONINFO
dwOSVersionInfoSize As Long
dwMajorVersion As Long
dwMinorVersion As Long
dwBuildNumber As Long
dwPlatformId As Long
szCSDVersion As String * 128
End Type

Type MEMORYSTATUS
dwLength As Long
dwMemoryLoad As Long
dwTotalPhys As Long
dwAvailPhys As Long
dwTotalPageFile As Long
dwAvailPageFile As Long
dwTotalVirtual As Long
dwAvailVirtual As Long
End Type

Declare Function GetVersionEx Lib "kernel32"
Alias "GetVersionExA" (LpVersionInformation
As OSVERSIONINFO) As Long
Declare Sub GlobalMemoryStatus Lib "kernel32"
(lpBuffer As MEMORYSTATUS)
Declare Sub GetSystemInfo Lib "kernel32"
(lpSystemInfo As SYSTEM_INFO)

Public Const PROCESSOR_INTEL_386 = 386
Public Const PROCESSOR_INTEL_486 = 486
Public Const PROCESSOR_INTEL_PENTIUM = 586
Public Const PROCESSOR_MIPS_R4000 = 4000
Public Const PROCESSOR_ALPHA_21064 = 21064

- Mostrar un fichero AVI a pantalla completa

Crear un formulario y escribir:

Private Declare Function mciSendString Lib
"winmm.dll" Alias "mciSendStringA"
(ByVal lpstrCommand As String,
ByVal lpstrReturnString As Any,
ByVal uReturnLength As Long,
ByVal hwndCallback As Long) As Long

Private Sub Form_Load()
CmdStr$ = "play e:\media\avi\nombre.avi fullscreen"
ReturnVal& = mciSendString(CmdStr$, 0&, 0, 0&)
End Sub

- Crear un link con un programa añadiéndolo al grupo de programas situado en

Inicio -> Programas o Start -> Programas:

Crear un formulario y escribir:

Private Declare Function fCreateShellLink
Lib "STKIT432.DLL" (ByVal lpstrFolderName
As String, ByVal lpstrLinkName As String,
ByVal lpstrLinkPath As String,
ByVal lpstrLinkArgs As String) As Long

Private Sub Form_Load()
iLong = fCreateShellLink("",
"Visual Basic", "C:\Archivos de Programa\DevStudio\Vb\vb5.exe", "")
End Sub

- Apagar el equipo, reiniciar Windows, reiniciar el Sistema

Añadir tres botones a un formulario y escribir lo siguiente en el código del formulario:

Private Declare Function ExitWindowsEx& Lib "user32" (ByVal
uFlags&, ByVal dwReserved&)

Private Sub Command1_Click()
Dim i as integer
i = ExitWindowsEx(1, 0&) 'Apaga el equipo
End Sub

Private Sub Command2_Click()
Dim i as integer
i = ExitWindowsEx(0, 0&) 'Reinicia Windows con nuevo usuario
End Sub

Private Sub Command3_Click()
Dim i as integer
i = ExitWindowsEx(2, 0&) 'Reinicia el Sistema
End Sub

- Borrar un fichero y enviarlo a la papelera de reciclaje

Crear un formulario y escribir el siguiente código:

Private Type SHFILEOPSTRUCT
hWnd As Long
wFunc As Long
pFrom As String
pTo As String
fFlags As Integer
fAnyOperationsAborted As Boolean
hNameMappings As Long
lpszProgressTitle As String
End Type

Private Declare Function SHFileOperation Lib "shell32.dll" Alias
"SHFileOperationA" (lpFileOp As SHFILEOPSTRUCT) As Long

Private Const FO_DELETE = &H3
Private Const FOF_ALLOWUNDO = &H40

Public Sub PapeleraDeReciclaje(ByVal Fichero As String)
Dim SHFileOp As SHFILEOPSTRUCT
Dim RetVal As Long
With SHFileOp
.wFunc = FO_DELETE
.pFrom = FileName
.fFlags = FOF_ALLOWUNDO
End With
RetVal = SHFileOperation(SHFileOp)
End Sub

Private Sub Form_Load()
Recycle "c:\a.txt"
End Sub

El programa preguntará si deseamos o no eliminar el fichero y enviarlo a la papelera de reciclaje.

El parámetro .fFlags nos permitirá recuperar el fichero de la papelera si lo deseamos

Si eliminamos esta línea, el fichero no podrá ser recuperado.

- Abrir el Acceso telefónico a Redes de Windows y ejecutar una conexión

Crear un formulario y escribir el siguiente código:

Private Sub Form_Load()
Dim AbrirConexion As Long
AbrirConexion = Shell("rundll32.exe rnaui.dll,RnaDial " &
"ConexiónInternet", 1)
SendKeys "{ENTER}"
End Sub

- Situar una ScroolBar horizontal en un ListBox

Crear un formulario y escribir el siguiente código:

Private Declare Function SendMessage Lib "user32" Alias
"SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long,
ByVal wParam As Long, lParam As Any) As Long

Private Sub Form_Load()
Dim x As Integer, i As Integer
For i = 1 To 20
List1.AddItem "El número final de la selección es el " & i
Next i
x = SendMessage(List1.hwnd, &H194, 200, ByVal 0&)
End Sub

- Obtener el nombre de usuario y de la compañia de Windows

Crear un formulario, añadir dos etiquetas o labels y escribir el siguiente código:

Private Declare Function RegQueryValueEx Lib "advapi32.dll" Alias 
"RegQueryValueExA" (ByVal hKey As Long, ByVal lpValueName As String, 
ByVal lpReserved As Long, lpType As Long, lpData As Any, 
lpcbData As Long) As Long
Private Declare Function RegOpenKey Lib "advapi32.dll" Alias 
"RegOpenKeyA" (ByVal hKey As Long, ByVal lpSubKey As String, 
phkResult As Long) As Long
Private Declare Function RegCloseKey Lib "advapi32.dll" 
(ByVal hKey As Long) As Long

Private Sub Form_Load()
    Dim strUser As String
    Dim strOrg As String
    Dim lngLen As Long
    Dim lngType As Long
    Dim hKey As Long
    Dim x As Long
    Const HKEY_LOCAL_MACHINE = &H80000002
    Const REG_SZ = &H1
    x = RegOpenKey(HKEY_LOCAL_MACHINE, 
"Software\Microsoft\Windows\CurrentVersion", 
hKey) ' open desired key in registry
    strUser = Space$(256)
    lngLen = Len(strUser)
    x = RegQueryValueEx(hKey, "RegisteredOwner", 
0, lngType, ByVal strUser, lngLen)
    If x = 0 And lngType = REG_SZ And lngLen > 1 Then
        strUser = Left$(strUser, lngLen - 1)
    Else
        strUser = "Unknown"
    End If
    strOrg = Space$(256)
    lngLen = Len(strOrg)
    x = RegQueryValueEx(hKey, "RegisteredOrganization", 0, lngType, 
ByVal strOrg, lngLen)
    If x = 0 And lngType = REG_SZ And lngLen > 1 Then
        strOrg = Left$(strOrg, lngLen - 1)
    Else
        strOrg = "Unknown"
    End If
    Label1.Caption = "Usuario: " & strUser
    Label2.Caption = "Empresa: " & strOrg
    x = RegCloseKey(hKey)
End Sub

- Forzar a un TextBox para que admita únicamente números

Crear un formulario, añadir un TextBox y escribir el siguiente código:

Sub Text1_Keypress(KeyAscii As Integer)
    If KeyAscii <> Asc("9") Then
    'KeyAscii = 8 es el retroceso o BackSpace
       If KeyAscii <> 8 Then
           KeyAscii = 0
       End If
    End If
End Sub

- Forzar a un InputBox para que admita únicamente números

Crear un formulario y escribir el siguiente código:

Private Sub Form_Load()
    Dim Numero As String
    Do
        Numero = InputBox("Introduzca un numero:")
    Loop Until IsNumeric(Numero)
    MsgBox "El numero es el " & Numero
    Unload Me
End Sub

- Hacer Drag & Drop de un control (ejemplo de un PictureBox)

En un formulario, añadir un PictureBox con una imagen cualquiera y escribir el siguiente código:

Private DragX As Integer
Private DragY As Integer

Sub Form_DragDrop(Source As Control, X As Single, Y As Single)
    Source.Move (X - DragX), (Y - DragY)
End Sub

Private Sub Picture1_MouseDown(Button As Integer, Shift As Integer, 
X As Single, Y As Single)
    'Si el boton del raton es el derecho, no hacemos nada
    If Button = 2 Then Exit Sub
    Picture1.Drag 1
    DragX = X
    DragY = Y
End Sub

Private Sub Picture1_MouseUp(Button As Integer, Shift As Integer, 
X As Single, Y As Single)
    Picture1.Drag 2
End Sub

- Centrar una ventana en Visual Basic

Usar:

Move (Screen.Width - Width) \ 2, (Screen.Height - Height) \ 2

En vez de:

Form1.Left = Screen.Width - Width \ 2
Form1.Top = Screen.Height - Height \ 2

- Ejecuta pausas durante un determinado espacio de tiempo en segundos

Llamada: Espera(5)

Sub Espera(Segundos As Single)
  Dim ComienzoSeg As Single
  Dim FinSeg As Single
  ComienzoSeg = Timer
  FinSeg = ComienzoSeg + Segundos
  Do While FinSeg > Timer
      DoEvents
      If ComienzoSeg > Timer Then
          FinSeg = FinSeg - 24 * 60 * 60
      End If
  Loop 
End Sub

- Editor de texto:

Seleccionar todo el texto:
    Text1.SetFocus
    Text1.SelStart = 0
    Text1.SelLength = Len(Text1.Text)

Copiar texto:
    Clipboard.Clear
    Clipboard.SetText Text1.SelText
    Text1.SetFocus

Pegar texto:
    Text1.SelText = Clipboard.GetText()
    Text1.SetFocus

Cortar texto:
    Clipboard.SetText Text1.SelText
    Text1.SelText = ""
    Text1.SetFocus

Deshacer texto:  (Nota: esta operación sólo es eficaz con el control Rich TextBox).

En un módulo copie esta línea:

Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal _
hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Long) As Long

Esta es la instrucción de la función deshacer:

   UndoResultado = SendMessage(Text1.hwnd, &HC7, 0&, 0&)
    If UndoResultado = -1 Then
        Beep
        MsgBox "Error al intentar recuperar.", 20, "Deshacer texto"
    End If

Seleccionar todo el texto:
    SendKeys "^A"

Copiar texto:
    SendKeys "^C"
    
Pegar texto:
    SendKeys "^V"

Cortar texto:
    SendKeys "^X"

Deshacer texto:
    SendKeys "^Z"