Restoring a CString From a LPARAM

I am trying to pass data between two applications via SendMessage.

I can pass integers back and forth fine, but I am have problems passing any char data.

CWnd* pWnd = CWnd::FromHandle(hWnd);

char *text =  "this won't come through";  // doesn't work
int x = 90;  // passes fine

pWnd->SendMessage( MY_MESSAGE, (WPARAM) x, (LPARAM), text);

LRESULT CMainFrame::OnExternalMessage(WPARAM wParam, LPARAM lParam)

   // wParam is OK
    CString FileName = (char *) lParam;
  //   FileName  is  = ""  no good

What am I doing wrong ?


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Two applications have their own process address space. You need an Interprocess Communication (IPC) mechanism. In your case, use WM_COPYDATA.

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Inter-Process Communication Using WM_COPYDATA
nielsewAuthor Commented:
thank you! thank you!

I should have posted this question about 3 hours ago!

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System Programming

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