by Dalin Nie (5 Submissions)
Category: Windows API Call/Explanation
Compatability: Visual Basic 3.0
Difficulty: Unknown Difficulty
Date Added: Wed 3rd February 2021
Rating: 
(5 Votes)
This function capture the screen or the active window of your computer
Programmatically and save it to a .bmp file. This may allows you to get another machine's
screen through network!!! Fully tested in VB5.
VBcoders'1: Declare
' This should be in the form's heneral declaration area.
' If you do it in a module, omit the word "Private"
Private Declare Sub keybd_event Lib "user32" (ByVal bVk As Byte, ByVal bScan As Byte, _
ByVal dwFlags As Long, ByVal dwExtraInfo As Long)
'
'2. The Function
' You can add this to your form's code
' or you can put it in a module if the declaration is in a module
Public Function fSaveGuiToFile(ByVal theFile As String) As Boolean
' Name: fSaveGuiToFile
' Author: Dalin Nie
' Written: 4/2/99
' Purpose:
' This procedure will Capture the Screen or the active window of your Computer and Save it as
' a .bmp file
' Input:
' theFile file Name with path, where you want the .bmp to be saved
'
' Output:
' True if successful
'
Dim lString As String
On Error goto Trap
'Check if the File Exist
If Dir(theFile) <> "" Then Exit Function
'To get the Entire Screen
Call keybd_event(vbKeySnapshot, 1, 0, 0)
'To get the Active Window
'Call keybd_event(vbKeySnapshot, 0, 0, 0)
SavePicture Clipboard.GetData(vbCFBitmap), theFile
fSaveGuiToFile = True
Exit Function
Trap:
'Error handling
MsgBox "Error Occured in fSaveGuiToFile. Error #: " & Err.Number & ", " & Err.Description
End Function
'
3. To call the function, add the code:
Call fSaveGuiToFile(yourFileNAme)
' Example: in a command1_click event add: call fSaveGuiToFile("C:\Scrn_pic.bmp")
'When you run your app, click command1, the screen will be saved in c:\scrn_pic.bmp.
