Why this doesn't work !!!???

Hi ,

I am trying to draw the image of the NotePad Window on an Excel UserForm DC via the PrintWindow API function But the code below doesn't work :mad:

Can anyone spot where the problem is or if I am missing something ?

VB Code:

Private Declare Function PrintWindow Lib "user32" _
(ByVal hwnd As Long, ByVal hdcBlt As Long, ByVal nFlags As Long) As Long
 
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" _
(ByVal lpClassName As String, ByVal lpWindowName As String) As Long
 
Private Declare Function ReleaseDC Lib "user32" _
(ByVal hwnd As Long, ByVal hdc As Long) As Long
 
Private Declare Function GetDC Lib "user32" (ByVal hwnd As Long) As Long
 
Dim lhwnd, hdc, mWnd As Long
 
 
Private Sub UserForm_Initialize()
 
    lhwnd = FindWindow(vbNullString, Me.Caption)
    hdc = GetDC(lhwnd)
 
    'KPD-Team 2001
    'URL: [url]http://www.allapi.net/[/url]
    'E-Mail: [email][email protected][/email]
    'launch notepad
    Shell "notepad.exe", vbNormalNoFocus
    DoEvents
 
    'search the handle of the notepad window
    mWnd = FindWindow("Notepad", vbNullString)
    If mWnd = 0 Then
       MsgBox "NotePad window not found!"
    Else
        'draw the image of the notepad window on our form
        PrintWindow mWnd, hdc, 0
    End If
 
 
End Sub
 
Private Sub UserForm_Terminate()
 
    ReleaseDC lhwnd, hdc
 
End Sub

Any takers ?

Regards.

Dont use this code in UserForm_Initialize. This is before form shows up. Use it for example in UserForm_Click().

3 things to change, just give it a try:

firstly: cut the code from under Initialize event and paste it in either UserForm_Load event or Under _click event as suggested by bilm_ks.

second, in VB Dim lhwnd, hdc, mWnd As Long lhwmd and hdc are not of Long type. in VB, they are now Variant type. Use

VB Code:

Dim lhwnd As Long, hdc As Long, mWnd As Long

and Third, hdc is a native variable name, so you cannot use it. instead use

VB Code:

Dim lhwnd As Long, [hl]myhdc[/hl] As Long, mWnd As Long

(replace all hdc with mhdc in your code)

Harsh Gupta