Send Message(string) c# exe to vc++ exe(unmanaged) using WindowsSendMessage

[Mayur]

I tried followinf but working fine fo int but how to do it for string using
user custome message

in c#
[DllImport("User32.dll")]

public static extern int FindWindow(string strClassName,string
strWindowName);

[DllImport("User32.dll")]

public static extern Int32 SendMessage(

int hWnd, // handle to destination window

int Msg, // message

int wParam, // first message parameter

[MarshalAs(UnmanagedType.LPStr)] string lParam);

public const int WM_APP = 0x8000;

public const int WM_DELETEALL =WM_APP + 0x100;

int wnd=FindWindow(null,"TestMfcSendMsgExe");

Form1.SendMessage(wnd,WM_DELETEALL,0,55);

and MFC Exe is like this

#define WM_DELETEALL WM_APP + 0x100

BEGIN_MESSAGE_MAP(CTestMfcSendMsgExeDlg, CDialog)

ON_MESSAGE (WM_DELETEALL, OnDeleteAll)
END_MESSAGE_MAP()

LRESULT CTestMfcSendMsgExeDlg::OnDeleteAll(WPARAM wParam, LPARAM lParam)

{

MessageBox("Hello","Mayur",MB_OK);

}

I am getting the message box after using SendMessage() in c# exe but i want
to send text(string ) information.

I need help..

Regards,

Mayur.

[Ben Voigt]

"Mayur" <ma***@activelement.comwrote in message
news:uO**************@TK2MSFTNGP06.phx.gbl...

>I tried followinf but working fine fo int but how to do it for string using
user custome message

go directly to www.pinvoke.net, do not pass go, do not collect 200 MB.

>
in c#
[DllImport("User32.dll")]

public static extern int FindWindow(string strClassName,string
strWindowName);

[DllImport("User32.dll")]

public static extern Int32 SendMessage(

int hWnd, // handle to destination window

int Msg, // message

int wParam, // first message parameter

[MarshalAs(UnmanagedType.LPStr)] string lParam);

public const int WM_APP = 0x8000;

public const int WM_DELETEALL =WM_APP + 0x100;

int wnd=FindWindow(null,"TestMfcSendMsgExe");

Form1.SendMessage(wnd,WM_DELETEALL,0,55);

and MFC Exe is like this

#define WM_DELETEALL WM_APP + 0x100

BEGIN_MESSAGE_MAP(CTestMfcSendMsgExeDlg, CDialog)

ON_MESSAGE (WM_DELETEALL, OnDeleteAll)
END_MESSAGE_MAP()

LRESULT CTestMfcSendMsgExeDlg::OnDeleteAll(WPARAM wParam, LPARAM lParam)

{

MessageBox("Hello","Mayur",MB_OK);

}

I am getting the message box after using SendMessage() in c# exe but i
want
to send text(string ) information.

I need help..

Regards,

Mayur.