使用SendMessage的C#,WM_COPYDATA的问题

Question

我花了几天(或更多)试图让这个工作.

手边的应用是FTPRush的,我知道有一个叫CMD行应用程序rush_cmdline.exe,它使用SendMessage将请求发送到FTPRush.

从调试rush_cmdline.exe,我可以看到lParam,wParam,Message和hWnd.

我的代码如下(使用SendMessage,而不是SendMessageW):

[DllImport("User32.dll", EntryPoint = "FindWindow")]
public static extern Int32 FindWindow(String lpClassName, String lpWindowName);
[DllImport("USER32.DLL", EntryPoint= "SendMessage")]
public static extern IntPtr SendMessage(int hWnd, int Msg, int wParam, IntPtr lParam);

我还尝试了另一个规范:

[DllImport("User32.dll", EntryPoint = "SendMessage")]
public static extern int SendMessage(int hWnd, int Msg, int wParam, ref COPYDATASTRUCT lParam);

handle(hWnd)不是问题,因为这有效:

int ftprush = FindWindow("TfmRush", null);
ShowWindow(ftprush, 8);

哪个(我没有粘贴dllimport,因为它在这里不重要.如果你想看到它,请告诉我)将窗口带到前面.另外,我通过调试检查rush_cmdline.exe.所以手柄是一样的.

两次尝试都失败了(默默地):

public const Int32 WM_COPYDATA = 0x4A;
string msg = "RushApp.FTP.Login('backup','',0); ";
// 1
byte[] array = Encoding.UTF8.GetBytes((string)msg);
int size = Marshal.SizeOf(array[0]) * array.Length + Marshal.SizeOf(array[0]);
IntPtr ptr = Marshal.AllocHGlobal(size);
Marshal.Copy(array, 0, ptr, array.Length);
Marshal.WriteByte(ptr, size - 1, 0);
SendMessage(ftprush, WM_COPYDATA, 0, ptr);

// 2
public struct COPYDATASTRUCT
{
   public IntPtr dwData;
   public int cbData;
   [MarshalAs(UnmanagedType.LPStr)]
   public string lpData;
}

COPYDATASTRUCT cds;
cds.dwData = (IntPtr)100;
cds.lpData = msg;
cds.cbData = sarr.Length + 1;
SendMessage(ftprush, WM_COPYDATA, 0, ref cds);

我希望至少第二个解决方案能够正常工作,因为它与此相符:perl示例

任何启蒙都非常感激!

谢谢,

• 坦率

更新:

string msg = "RushApp.FTP.Login('backup','',0);\0";
var cds = new COPYDATASTRUCT
{
            dwData = new IntPtr(3),
            cbData = msg.Length + 1,
            lpData = msg
};
IntPtr ftprush = FindWindow("TfmRush", null);
SendMessage(ftprush, WM_COPYDATA, IntPtr.Zero, ref cds);

Answer 1

我的定义有

[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = false)]
public static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, ref COPYDATASTRUCT lParam);

public struct COPYDATASTRUCT {
  public int cbData;
  public IntPtr dwData;
  [MarshalAs(UnmanagedType.LPStr)] public string lpData;
}

var cds = new Win32.COPYDATASTRUCT {
                                           dwData = new IntPtr(3),
                                           cbData = str.Length + 1,
                                           lpData = str
                                         };
Win32.SendMessage(ftprush, Win32.WM_COPYDATA, IntPtr.Zero, ref cds);

当然,确保str为空终止"\ 0"

或者,PInvoke.NET给出的定义是

[DllImport("user32.dll", CharSet = CharSet.Auto)]
static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, IntPtr wParam, StringBuilder lParam);
//If you use '[Out] StringBuilder', initialize the string builder with proper length first.

Answer 2

Between the 2 answers above I cobbled together a working example. Bryce Wagner's class works, so I added a method to use SendMessageTimeout to send the data. it's a static method, so you just call it to send data. This isn't really my work, just gluing together and sharing back.

    [StructLayout(LayoutKind.Sequential)]
    public struct CopyData: IDisposable {
        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = false)]
        static extern IntPtr SendMessageTimeout(IntPtr hWnd, uint Msg, IntPtr wParam, ref CopyData target,
                                                SendMessageTimeoutFlags fuFlags, uint uTimeout, out UIntPtr lpdwResult);

        [Flags]
        enum SendMessageTimeoutFlags: uint {
            SMTO_NORMAL             = 0x0,
            SMTO_BLOCK              = 0x1,
            SMTO_ABORTIFHUNG        = 0x2,
            SMTO_NOTIMEOUTIFNOTHUNG = 0x8
        }
        const uint WM_COPYDATA = 0x4A;

        public IntPtr dwData;
        public int cbData;
        public IntPtr lpData;

        public void Dispose() {
            if (lpData != IntPtr.Zero) {
                Marshal.FreeCoTaskMem(lpData);
                lpData = IntPtr.Zero;
                cbData = 0;
            }
        }
        public string AsAnsiString {
            get { return Marshal.PtrToStringAnsi(lpData, cbData); }
        }
        public string AsUnicodeString {
            get { return Marshal.PtrToStringUni(lpData); }
        }
        public static CopyData CreateForString(int dwData, string value, bool Unicode = false) {
            var result = new CopyData();
            result.dwData = (IntPtr) dwData;
            result.lpData = Unicode ? Marshal.StringToCoTaskMemUni(value) : Marshal.StringToCoTaskMemAnsi(value);
            result.cbData = value.Length + 1;
            return result;
        }

        public static UIntPtr Send(IntPtr targetHandle, int dwData, string value, uint timeoutMs = 1000, bool Unicode = false) {
            var cds = CopyData.CreateForString(dwData, value, Unicode);
            UIntPtr result;
            SendMessageTimeout(targetHandle, WM_COPYDATA, IntPtr.Zero, ref cds, SendMessageTimeoutFlags.SMTO_NORMAL, timeoutMs, out result);
            cds.Dispose();
            return result;
        }
    }

To use it:

CopyData.Send(targetHandle, 1234, "This is a test");

That uses the default 1 second timeout.