I have two C# Applications. The first application has to send 2 strings to the other application. The first string is just a simple string "abc", while the 2nd string contains a path (Application.StartupPath). This is the code I use to send the data:
- //Used for WM_COPYDATA for string messages
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public struct COPYDATASTRUCT
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{
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public IntPtr dwData;
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public int cbData;
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[MarshalAs(UnmanagedType.LPStr)]
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public string jobName;
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[MarshalAs(UnmanagedType.LPStr)]
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public string path;
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}
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public int sendWindowsStringMessage(int hWnd, int wParam, string msg)
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{
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int result = 0;
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if (hWnd > 0)
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{
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byte[] sarr = System.Text.Encoding.Default.GetBytes(msg);
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int len = sarr.Length;
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COPYDATASTRUCT cds = new COPYDATASTRUCT();
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cds.dwData = (IntPtr)100;
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cds.jobName = msg; //first string
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cds.path = Application.StartupPath; //path string
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cds.cbData = len + 1;
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result = SendMessage(hWnd, WM_COPYDATA, wParam, ref cds);
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}
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return result;
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}
And this is how I listen for it:
- //Receives Windows Messages
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protected override void WndProc(ref Message message)
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{
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if (message.Msg == WM_COPYDATA)
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{
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COPYDATASTRUCT mystr = new COPYDATASTRUCT();
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Type mytype = mystr.GetType();
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mystr = (COPYDATASTRUCT)message.GetLParam(mytype);
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//see what path is being passed.
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MessageBox.Show(mystr.path);
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//Process
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Process(mystr.jobName);
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-
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}
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//be sure to pass along all messages to the base also
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base.WndProc(ref message);
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}
The first string (jobName) is received fine, but the second string (path) comes up as a bunch of garbage characters. The path on the sending side is sent as "C:\\Path\\Dir", on the receiving side i get "¸`dã"
Any idea why path strings aren't being sent correctly?
