以编程方式从没有 UI 对话框的 Windows 回收站中删除项目答案

【问题标题】：Programmatically delete item from Windows Recycle Bin without UI dialog以编程方式从没有 UI 对话框的 Windows 回收站中删除项目
【发布时间】：2020-09-19 20:46:54
【问题描述】：

我使用IContextMenu 和"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。有没有其他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gist

【问题讨论】：

IFileOperation
根据Invoking commands on items in the Recycle Bin：“回收站的一个烦恼是，至少在 Windows 7 之前，它忽略 CMIC_MASK_FLAG_NO_UI 标志。它总是显示一个确认对话框如果即将发生危险的事情（例如覆盖现有文件）。“因此您可能必须手动检测并关闭弹出确认。
@JonathanPotter IFileOperation's DeleteItem 成功了，谢谢。

标签： c++ windows winapi recycle-bin

【解决方案1】：

您可以安装WH_CBT 挂钩，并在其回调中监视HCBT_CREATEWND 的nCode。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来点击Yes按钮，对话框将自动关闭。

代码示例：

main.cpp

#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;
}

【讨论】：