API SendMessage 带参数

代码未测试

[DllImport("USER32", EntryPoint = "SendMessage", CharSet = CharSet.Auto, SetLastError = true)] 
public static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam); 

IntPtr textPointer = Marshal.StringToCoTaskMemUni("Magic String"); 

SendMessage(handle, WM_SETTEXT, IntPtr.Zero, textPointer); 

Marshal.FreeCoTaskMem(textPointer);

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Marshal.PtrToStringUni  解析