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CallWindowProc The CallWindowProc function passes message information to the specified window procedure.
VB4-32,5,6
Declare Function CallWindowProc Lib "user32" Alias "CallWindowProcA" (ByVal lpPrevWndFunc As Long, ByVal hWnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long |
VB.NET
System.Windows.Forms.Form.WndProc |
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Operating Systems Supported |
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Requires Windows NT 3.1 or later; Requires Windows 95 or later |
- lpPrevWndFunc
Pointer to the previous window procedure.
If this value is obtained by calling the GetWindowLong function with the nIndex parameter set to GWL_WNDPROC or DWL_DLGPROC, it is actually either the address of a window or dialog box procedure, or a handle representing that address.
- hWnd
Identifies the window procedure to receive the message.
- Msg
Specifies the message.
- wParam
Specifies additional message-specific information. The contents of this parameter depend on the value of the Msg parameter.
- lParam
Specifies additional message-specific information. The contents of this parameter depend on the value of the Msg parameter. |
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The return value specifies the result of the message processing and depends on the message sent. |
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