C # Call WinAPI to send SendMessage

Call methods in DLL

First, the external method should be declared in the C # language source program. The basic form is:
[DLLImport ("DLL file")]

Modifier extern return variable type method name (parameter list)
[DllImport ("user32.dll", EntryPoint = "SendMessage")]
Public static extern int SendMessage (
IntPtr hWnd, // handle to destination window
Int Msg, // message
Int wParam, // first message parameter
Int lParam // second message parameter
); Www.2cto.com

For DllImport, it must be before the method (For details, refer to MSDN). EntryPoint = "SendMessage" indicates the name of the function in the DLL (if it is wrong, the portal cannot be found ).

You can directly call the SendMessage (parameter 1, parameter 2, parameter 3, parameter 4) method when needed.