c#使用SendMessage, WM_COPYDATA的问题

本文关键字：COPYDATA 问题 WM 使用 SendMessage | 更新日期: 2023-09-27 18:03:07

我已经花了几天(或更多)的时间试图让这个工作。

手头的应用程序是FTPRush，我知道有一个名为rush_cmdline.exe的cmd行应用程序，它使用SendMessage向FTPRush发送请求。

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，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);

我还尝试了另一种规格:

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

句柄(hWnd)不是问题，因为它工作:

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

我没有粘贴dllimport，因为它在这里不重要。让我知道如果你想看到它)带来的窗口到前面。此外，我通过调试rush_cmdline.exe进行了检查。所以句柄是一样的

两次尝试都失败(静默):

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可以工作，因为它与这个匹配得很好:

任何启发都是非常感激的!

谢谢,

    弗兰克
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);

c#使用SendMessage, WM_COPYDATA的问题

My Definitions have

[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，要确保str以null结尾"'0"

可以选择由PInvoke给出的定义。网络是

[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.

在上面的两个答案之间，我拼凑了一个工作示例。Bryce Wagner的类可以工作，所以我添加了一个方法来使用SendMessageTimeout发送数据。这是一个静态方法，你只需调用它来发送数据。这不是我真正的工作，只是把它们粘在一起，然后分享回来。

    [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;
        }
    }

使用它:

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

使用默认的1秒超时。

COPYDATASTRUCT中参数的顺序非常重要，而Bob Vale的答案中参数的顺序是错误的。http://msdn.microsoft.com/en-us/library/windows/desktop/ms649010(v=vs.85).aspx应该是这样的顺序:

[StructLayout(LayoutKind.Sequential)]
public struct COPYDATASTRUCT
{
    public IntPtr dwData;
    public int cbData;
    public IntPtr lpData;
}

我还没有得到MarshalAs(UnmanagedType.LPStr)] public string lpData的工作。我只是通过自己做编组来让它工作:

[StructLayout(LayoutKind.Sequential)]
public struct COPYDATASTRUCT : IDisposable
{
    public IntPtr dwData;
    public int cbData;
    public IntPtr lpData;
    /// <summary>
    /// Only dispose COPYDATASTRUCT if you were the one who allocated it
    /// </summary>
    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 COPYDATASTRUCT CreateForString(int dwData, string value, bool Unicode = false)
    {
        var result = new COPYDATASTRUCT();
        result.dwData = (IntPtr)dwData;
        result.lpData = Unicode ? Marshal.StringToCoTaskMemUni(value) : Marshal.StringToCoTaskMemAnsi(value);
        result.cbData = value.Length + 1;
        return result;
    }
}
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