让Qt 具有多选文件夹和记忆上一次打开位置的文件对话框

最近要做一个可以多选文件夹的功能，在网上查阅了多个资料，发现github有一段代码可以实现该功能，于是将其收入进行改造。另外qt自带的 getExistingDirectory 和 getOpenFileNames 不具有记忆上一次打开的文件夹位置。要实现多选文件夹和记忆上一次打开位置能用到的就只有IFileOpenDialog 接口了。
原代码如下
出处：https://gist.github.com/0xF5T9/3f3203950f480d348aa6d99850a26016

#include <iostream>
#include <windows.h>
#include <shobjidl.h>
#include <string>
#include <vector>/*** @brief Open a dialog to select item(s) or folder(s).* @param paths Specifies the reference to the string vector that will receive the file or folder path(s). [IN]* @param selectFolder Specifies whether to select folder(s) rather than file(s). (optional)* @param multiSelect Specifies whether to allow the user to select multiple items. (optional)* @note If no item(s) were selected, the function still returns true, and the given vector is unmodified.* @note `<windows.h>`, `<string>`, `<vector>`, `<shobjidl.h>`* @return Returns true if all the operations are successfully performed, false otherwise.*/
bool OpenFileDialog(std::vector<std::wstring> &paths, bool selectFolder = false, bool multiSelect = false)
{IFileOpenDialog *p_file_open = nullptr;bool are_all_operation_success = false;while (!are_all_operation_success){HRESULT hr = CoCreateInstance(CLSID_FileOpenDialog, NULL, CLSCTX_ALL,IID_IFileOpenDialog, reinterpret_cast<void **>(&p_file_open));if (FAILED(hr))break;if (selectFolder || multiSelect){FILEOPENDIALOGOPTIONS options = 0;hr = p_file_open->GetOptions(&options);if (FAILED(hr))break;if (selectFolder)options |= FOS_PICKFOLDERS;if (multiSelect)options |= FOS_ALLOWMULTISELECT;hr = p_file_open->SetOptions(options);if (FAILED(hr))break;}hr = p_file_open->Show(NULL);if (hr == HRESULT_FROM_WIN32(ERROR_CANCELLED)) // No items were selected.{are_all_operation_success = true;break;}else if (FAILED(hr))break;IShellItemArray *p_items;hr = p_file_open->GetResults(&p_items);if (FAILED(hr))break;DWORD total_items = 0;hr = p_items->GetCount(&total_items);if (FAILED(hr))break;for (int i = 0; i < static_cast<int>(total_items); ++i){IShellItem *p_item;p_items->GetItemAt(i, &p_item);if (SUCCEEDED(hr)){PWSTR path;hr = p_item->GetDisplayName(SIGDN_FILESYSPATH, &path);if (SUCCEEDED(hr)){paths.push_back(path);CoTaskMemFree(path);}p_item->Release();}}p_items->Release();are_all_operation_success = true;}if (p_file_open)p_file_open->Release();return are_all_operation_success;
}/*** @brief Open a dialog to save an item.* @param path Specifies the reference to the string that will receive the target save path. [IN]* @param defaultFileName Specifies the default save file name. (optional)* @param pFilterInfo Specifies the pointer to the pair that contains filter information. (optional)* @note If no path was selected, the function still returns true, and the given string is unmodified.* @note `<windows.h>`, `<string>`, `<vector>`, `<shobjidl.h>`* @return Returns true if all the operations are successfully performed, false otherwise.*/
bool SaveFileDialog(std::wstring &path, std::wstring defaultFileName = L"", std::pair<COMDLG_FILTERSPEC *, int> *pFilterInfo = nullptr)
{IFileSaveDialog *p_file_save = nullptr;bool are_all_operation_success = false;while (!are_all_operation_success){HRESULT hr = CoCreateInstance(CLSID_FileSaveDialog, NULL, CLSCTX_ALL,IID_IFileSaveDialog, reinterpret_cast<void **>(&p_file_save));if (FAILED(hr))break;if (!pFilterInfo){COMDLG_FILTERSPEC save_filter[1];save_filter[0].pszName = L"All files";save_filter[0].pszSpec = L"*.*";hr = p_file_save->SetFileTypes(1, save_filter);if (FAILED(hr))break;hr = p_file_save->SetFileTypeIndex(1);if (FAILED(hr))break;}else{hr = p_file_save->SetFileTypes(pFilterInfo->second, pFilterInfo->first);if (FAILED(hr))break;hr = p_file_save->SetFileTypeIndex(1);if (FAILED(hr))break;}if (!defaultFileName.empty()){hr = p_file_save->SetFileName(defaultFileName.c_str());if (FAILED(hr))break;}hr = p_file_save->Show(NULL);if (hr == HRESULT_FROM_WIN32(ERROR_CANCELLED)) // No item was selected.{are_all_operation_success = true;break;}else if (FAILED(hr))break;IShellItem *p_item;hr = p_file_save->GetResult(&p_item);if (FAILED(hr))break;PWSTR item_path;hr = p_item->GetDisplayName(SIGDN_FILESYSPATH, &item_path);if (FAILED(hr))break;path = item_path;CoTaskMemFree(item_path);p_item->Release();are_all_operation_success = true;}if (p_file_save)p_file_save->Release();return are_all_operation_success;
}int main()
{HRESULT hr = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED | COINIT_DISABLE_OLE1DDE);if (FAILED(hr)){std::cout << "Failed to initialize COM library.\n";return -1;}// Select an example.std::cout << "1. Select an item.\n";std::cout << "2. Select a folder.\n";std::cout << "3. Select multiple items.\n";std::cout << "4. Save an item.\n";std::cout << "5. Save an item with filters.\n";std::cout << "Select an example: ";int choice = 0;std::cin >> choice;switch (choice){// Example: Select an item.case 1:{std::vector<std::wstring> paths;if (OpenFileDialog(paths)){if (!paths.empty()){std::cout << "Total items: " << paths.size() << "\n";for (int i = 0; i < static_cast<int>(paths.size()); ++i)std::wcout << L"Path " << std::to_wstring(i + 1) << L": " << paths[i] << L"\n";}elsestd::cout << "No item were selected.\n";}break;}// Example: Select a folder.case 2:{std::vector<std::wstring> paths;if (OpenFileDialog(paths, true)){if (!paths.empty()){std::cout << "Total items: " << paths.size() << "\n";for (int i = 0; i < static_cast<int>(paths.size()); ++i)std::wcout << L"Path " << std::to_wstring(i + 1) << L": " << paths[i] << L"\n";}elsestd::cout << "No item were selected.\n";}break;}// Example: Select multiple items.case 3:{std::vector<std::wstring> paths;if (OpenFileDialog(paths, false, true)){if (!paths.empty()){std::cout << "Total items: " << paths.size() << "\n";for (int i = 0; i < static_cast<int>(paths.size()); ++i)std::wcout << L"Path " << std::to_wstring(i + 1) << L": " << paths[i] << L"\n";}elsestd::cout << "No item were selected.\n";}break;}// Example: Save an item.case 4:{std::wstring path = L"";if (SaveFileDialog(path, L"Some file.txt")){if (!path.empty()){std::wcout << L"Selected save path:  " << path << L"\n";}elsestd::cout << "No item were selected.\n";}break;}// Example: Save an item with filters.case 5:{std::wstring path = L"";const unsigned int total_filters = 3;COMDLG_FILTERSPEC filters[total_filters];filters[0].pszName = L"All files. (*.*)";filters[0].pszSpec = L"*.*";filters[1].pszName = L"Image files. (.bmp, .jpg, .png)";filters[1].pszSpec = L"*.bmp;*.jpg;*.png";filters[2].pszName = L"Specific file. (unique_file.txt)";filters[2].pszSpec = L"unique_file.txt";std::pair<COMDLG_FILTERSPEC *, int> filter_info = std::make_pair<COMDLG_FILTERSPEC *, int>(filters, total_filters);if (SaveFileDialog(path, L"", &filter_info)){if (!path.empty()){std::wcout << L"Selected save path: " << path << L"\n";}elsestd::cout << "No item were selected.\n";}break;}}CoUninitialize();return 0;
}std::vector<std::pair<std::wstring, std::wstring>> filters = {{L"文件类型(*.txt)", L"*.txt"},        // 过滤 .txt 文件};		if (auto files = GetOpenFileNames(L"导入转换的TXT文件", true, filters);files.has_value()){for (const auto& filename : files.value()){...}}

于是将其中的OpenFileDialog函数拿来进行改造：分别是选择文件 GetOpenFileNames 和文件夹 GetExistingDirectorys

使用时需要加入以下几个头文件：

#include <windows.h>
#include <shobjidl.h>
#include <string>
#include <vector>
#include<optional>

GetOpenFileNames 函数定义如下：

std::optional<std::vector <std::wstring>> GetOpenFileNames(const std::wstring& dialogTitle, bool multiSelect, const std::vector<std::pair<std::wstring, std::wstring>>& filters)
{IFileOpenDialog* p_file_open = nullptr;bool are_all_operation_success = false;std::optional<std::vector <std::wstring>>files;while (!are_all_operation_success){// Create the file dialog instanceHRESULT hr = CoCreateInstance(CLSID_FileOpenDialog, NULL, CLSCTX_ALL,IID_IFileOpenDialog, reinterpret_cast<void**>(&p_file_open));if (FAILED(hr))break;// Set dialog title if specifiedif (!dialogTitle.empty()){hr = p_file_open->SetTitle(dialogTitle.c_str());if (FAILED(hr))break;}// Handle folder selection and multi-select optionsif ( multiSelect){FILEOPENDIALOGOPTIONS options = 0;hr = p_file_open->GetOptions(&options);if (FAILED(hr))break;					options |= FOS_ALLOWMULTISELECT;hr = p_file_open->SetOptions(options);if (FAILED(hr))break;}if (!filters.empty()){std::vector<COMDLG_FILTERSPEC> filterSpecs;for (const auto& filter : filters){COMDLG_FILTERSPEC spec;spec.pszName = filter.first.c_str();  // Filter name as LPCWSTRspec.pszSpec = filter.second.c_str(); // File spec (e.g. "*.txt") as LPCWSTRfilterSpecs.push_back(spec);}// Now, we correctly call SetFileTypes to set the filterhr = p_file_open->SetFileTypes(static_cast<UINT>(filterSpecs.size()), filterSpecs.data());if (FAILED(hr)){// If it failed, we break the loopbreak;}}// Show the dialoghr = p_file_open->Show(NULL);if (hr == HRESULT_FROM_WIN32(ERROR_CANCELLED)) // No items were selected.{are_all_operation_success = true;break;}else if (FAILED(hr))break;// Retrieve the selected itemsIShellItemArray* p_items;hr = p_file_open->GetResults(&p_items);if (FAILED(hr))break;DWORD total_items = 0;hr = p_items->GetCount(&total_items);if (FAILED(hr))break;// Iterate over the selected items and add their paths to the vectorfor (int i = 0; i < static_cast<int>(total_items); ++i){IShellItem* p_item;p_items->GetItemAt(i, &p_item);if (SUCCEEDED(hr)){PWSTR path;hr = p_item->GetDisplayName(SIGDN_FILESYSPATH, &path);if (SUCCEEDED(hr)){if(!files.has_value()){files.emplace();}files->emplace_back(path);				CoTaskMemFree(path);}p_item->Release();}}p_items->Release();are_all_operation_success = true;}if (p_file_open)p_file_open->Release();CoUninitialize();return  files ;
}

GetExistingDirectorys函数定义如下：

std::optional<std::vector<std::wstring>> GetExistingDirectorys(const std::wstring& dialogTitle, bool multiSelect)
{IFileOpenDialog* p_file_open = nullptr;bool are_all_operation_success = false;std::optional<std::vector<std::wstring>> paths;while (!are_all_operation_success){// Create the file dialog instanceHRESULT hr = CoCreateInstance(CLSID_FileOpenDialog, NULL, CLSCTX_ALL,IID_IFileOpenDialog, reinterpret_cast<void**>(&p_file_open));if (FAILED(hr))break;// Set dialog title if specifiedif (!dialogTitle.empty()){hr = p_file_open->SetTitle(dialogTitle.c_str());if (FAILED(hr))break;}// Handle folder selection and multi-select optionsif ( multiSelect){FILEOPENDIALOGOPTIONS options = 0;hr = p_file_open->GetOptions(&options);if (FAILED(hr))break;			options |= FOS_ALLOWMULTISELECT|FOS_PICKFOLDERS;hr = p_file_open->SetOptions(options);if (FAILED(hr))break;}	// Show the dialoghr = p_file_open->Show(NULL);if (hr == HRESULT_FROM_WIN32(ERROR_CANCELLED)) // No items were selected.{are_all_operation_success = true;break;}else if (FAILED(hr))break;// Retrieve the selected itemsIShellItemArray* p_items;hr = p_file_open->GetResults(&p_items);if (FAILED(hr))break;DWORD total_items = 0;hr = p_items->GetCount(&total_items);if (FAILED(hr))break;// Iterate over the selected items and add their paths to the vectorfor (int i = 0; i < static_cast<int>(total_items); ++i){IShellItem* p_item;p_items->GetItemAt(i, &p_item);if (SUCCEEDED(hr)){PWSTR path;hr = p_item->GetDisplayName(SIGDN_FILESYSPATH, &path);if (SUCCEEDED(hr)){if(!paths.has_value()){paths.emplace();}paths->emplace_back(path);CoTaskMemFree(path);}p_item->Release();}}p_items->Release();are_all_operation_success = true;}if (p_file_open)p_file_open->Release();CoUninitialize();return paths;}//使用例子：
std::wstring dialogTitle = L"选择资料的文件夹";	
if (auto selectedPaths = GetExistingDirectorys(dialogTitle, true); selectedPaths.has_value())
{for (const auto& dir : selectedPaths.value()){...}				
}

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