使用WMLCopyDATA从C++向WPF发送结构

如果没有关于设置的更多信息,我不确定您的错误是什么。我尽可能地复制代码(在WPF应用程序中使用wndproc,从我自己的win32应用程序发送),它对我来说很好。如果运行64位应用程序,则会出现一些错误,即pack=1将导致copydatastruct错位,从指针读取可能会导致痛苦。

它是崩溃通过只是ints?查看通过lpwstr或wstring传递的注释代码将导致严重的问题,尽管在取消对发送的数据的标记之前,这不应该变得明显。

值得一提的是,这是我的代码片段,对我来说很有用,包括让命令行通过。

/* C++ code */
struct StackRecord
{
    wchar_t cmdline[128];
    int CursorX;
    int CursorY;
};

void SendCopyData(HWND hFind)
{
    COPYDATASTRUCT cp;
    StackRecord record;

    record.CursorX = 1;
    record.CursorY = -1;

    _tcscpy(record.cmdline, L"Hello World!");
    cp.cbData = sizeof(record);
    cp.lpData = &record;
    cp.dwData = 12;
    SendMessage(hFind, WM_COPYDATA, NULL, (LPARAM)&cp);
}

/* C# code */
public static readonly int WM_COPYDATA = 0x4A;

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

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public struct StackRecord
{
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst=128)]
    public string CommandLine;
    public Int32 CursorX;
    public Int32 CursorY;
}

protected override IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
    if (msg == WM_COPYDATA)
    {
        StackRecord record = new StackRecord();
        try
        {
            CopyDataStruct cp = (CopyDataStruct)Marshal.PtrToStructure(lParam, typeof(CopyDataStruct));
            if (cp.cbData == Marshal.SizeOf(record))
            {
                record = (StackRecord)Marshal.PtrToStructure(cp.lpData, typeof(StackRecord));
            }
        }
        catch (Exception e)
        {
            System.Diagnostics.Debug.WriteLine(e.ToString());
        }
        handled = true;
    }
    else
    {
        handled = false;
    }
    return IntPtr.Zero;
}

我已经构建了两个应用程序(分别使用vc++和vc),解决了问题的“分解”变体(即无法获得该结构),它们看起来工作得很完美,因此它可能确实与您的设置有关,如 tyranid 说。

总之,这是代码(它必须足够粘贴到新创建的 Win32应用程序 (对于VC++)和 Windows窗体应用程序 对于C运行和测试):

斯塔克普罗西普

#include "stdafx.h"
#include "StackProxy.h"
#include <string>


struct StackRecord {
    __int32 CursorX;
    __int32 CursorY;
};


int APIENTRY _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow) {
    StackRecord record;

    record.CursorX = 5;
    record.CursorY = 16;

    COPYDATASTRUCT data;

    data.dwData = 12;
    data.cbData = sizeof(StackRecord);
    data.lpData = &record;

    HWND target = FindWindow(NULL, _T("Window1"));

    if(target != NULL)
        SendMessage(target, WM_COPYDATA, (WPARAM)(HWND) target, (LPARAM)(LPVOID) &data);

    return 0;
}

格式1.CS

using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public struct COPYDATASTRUCT
        {
            public System.Int32 dwData;
            public System.Int32 cbData;
            public System.IntPtr lpData;
        }

        int WM_COPYDATA = 0x4A;

        [StructLayout(LayoutKind.Sequential)]
        public struct StackRecord
        {
            public Int32 CursorX;
            public Int32 CursorY;
        }

        public Form1()
        {
            InitializeComponent();
            Text = "Window1";
        }

        protected override void WndProc(ref Message msg)
        {
            if (msg.Msg == WM_COPYDATA) {
                COPYDATASTRUCT cp = (COPYDATASTRUCT)Marshal.PtrToStructure(msg.LParam, typeof(COPYDATASTRUCT));
                StackRecord record = (StackRecord)Marshal.PtrToStructure(cp.lpData, typeof(StackRecord));
                MessageBox.Show(String.Format("X: {0}, Y: {1}, Data: {2}", record.CursorX, record.CursorY, cp.dwData));
            } 
            base.WndProc(ref msg);
        }
    }
}

希望这有帮助。

P.S.我对C语言和(尤其是)互操作(对C++编程感兴趣)没有太多的了解,但是在几小时前没有人回答,只是觉得尝试这个问题是一个很好的挑战。更不用说赏金了。)

*嗯,我迟到了。)