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c++ - 以编程方式从没有 UI 对话框的 Windows 回收站中删除项目

问题描述

我正在使用IContextMenuwith"delete"动词从回收站中删除项目，但即使我使用CMIC_MASK_FLAG_NO_UI标志，它也会显示 UI 对话框。是否有另一种方法可以在不显示对话框的情况下从回收站中删除文件？

IContextMenu* contextMenu;
recycleBin->GetUIObjectOf(0, 1, (LPCITEMIDLIST*)(&pidl), IID_IContextMenu, 0, (LPVOID *)&contextMenu);
CMINVOKECOMMANDINFO ci;
memset(&ci, 0, sizeof(ci));
ci.fMask = CMIC_MASK_FLAG_NO_UI;
ci.cbSize = sizeof(CMINVOKECOMMANDINFO);
ci.lpVerb = "delete";
contextMenu->InvokeCommand(&ci);
contextMenu->Release();

包括回收站对象初始化和项目枚举的完整代码在要点上

标签： c++windowswinapirecycle-bin

解决方案

您可以安装WH_CBT挂钩，并在其回调中监视HCBT_CREATEWND. 如果你得到一个匹配的类名（'#32770 (Dialog)' ？）和一个匹配的标题或者从回调中返回一个非零值，你可以发送BM_CLICK到单击Yes按钮，对话框将自动关闭。

代码示例：

主文件

#include <iostream>
#include <windows.h>
#include <Ole2.h>
#include <shlobj.h>
#include <shlwapi.h>
#include <string>

#pragma comment(lib,"Shlwapi.lib")

HHOOK g_hhook;

int main()
{
    OleInitialize(0);

    HINSTANCE hinstDLL = LoadLibrary(TEXT("D:\\xxx\\Dll_WH_CBT\\Debug\\Dll_WH_CBT.dll"));
    HHOOK(*AttachHookProc)(DWORD);
    AttachHookProc = (HHOOK(*)(DWORD)) GetProcAddress(hinstDLL, "AttachHook");
    void(*RemoveHooks)(DWORD);
    RemoveHooks = (void(*)(DWORD))GetProcAddress(hinstDLL, "RemoveHooks");

    IShellFolder* desktop;
    if (FAILED(SHGetDesktopFolder(&desktop))) {
        std::cerr << "Failed to get desktop fodler" << std::endl;
        return -1;
    }

    ...
    IEnumIDList* enumFiles;
    if (FAILED(recycleBin->EnumObjects(0, SHCONTF_FOLDERS | SHCONTF_NONFOLDERS | 
SHCONTF_INCLUDEHIDDEN, &enumFiles)))
    {
        std::cerr << "Could not enumerate recycle bin objects" << std::endl;
        recycleBin->Release();
        return -1;
    }

    AttachHookProc(0);

    ...
      
    RemoveHooks(0);
    enumFiles->Release();
    recycleBin->Release();

    OleUninitialize();
    return 0;
}

DLL：

// dllmain.cpp : Defines the entry point for the DLL application.
#include "pch.h"
#include <Windows.h>

HMODULE thisModule;
HHOOK g_hhook;

LRESULT CALLBACK CBTProc(int nCode, WPARAM wParam, LPARAM lParam)
{        
    switch (nCode)
    {
    case HCBT_CREATEWND:
    {      
        HWND File_Window = FindWindow(L"#32770", L"Delete File"); 
        HWND Folder_Window = FindWindow(L"#32770", L"Delete Folder");
        if (File_Window)
        {
            HWND yes = FindWindowEx(File_Window, NULL, L"Button", L"&Yes");
            SendMessage(yes, BM_CLICK, 0, 0);
            SendMessage(yes, BM_CLICK, 0, 0);
        }
        if (Folder_Window)
        {
            HWND yes = FindWindowEx(Folder_Window, NULL, L"Button", L"&Yes");
            SendMessage(yes, BM_CLICK, 0, 0);
            SendMessage(yes, BM_CLICK, 0, 0);
        }
        break;
    }
    default:
        break;
    }
    return CallNextHookEx(g_hhook, nCode, wParam, lParam);
}

#ifdef __cplusplus    //If used by C++ code.
extern "C" {        //we need to export the C interface
#endif
    _declspec(dllexport) HHOOK AttachHook(DWORD threadID) {
        g_hhook = SetWindowsHookEx(WH_CBT, CBTProc, thisModule, threadID);

        return g_hhook;
    }
#ifdef __cplusplus
}
#endif

extern "C" {        //we need to export the C interface
    __declspec(dllexport) void RemoveHooks(DWORD)
    {
        UnhookWindowsHookEx(g_hhook);
    }
}

BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
                     )
{
    thisModule = hModule;
    switch (ul_reason_for_call)
    {
    case DLL_PROCESS_ATTACH:      
    case DLL_THREAD_ATTACH:
    case DLL_THREAD_DETACH:
    case DLL_PROCESS_DETACH:

        break;
    }
    return TRUE;
}

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