在拖拽文件还没有进入任何窗口时，怎样获取鼠标拖拽的文件信息？

像豆包电脑那样，鼠标在桌面上拖动一个文件，刚开始拖动，还没进入任何窗口，豆包就能感知到，然后在屏幕右下角弹出提示，可以帮忙解读文件。这个是怎么实现的？ 目前，通过鼠标钩子判断是否在拖拽，如果在拖拽，就通过 OleGetClipboard 函数从剪贴板获取文件信息，但是剪贴板里面没有文件相关的信息。代码如下：

#include <windows.h> #include <shlobj.h> #include <vector> #include <string> #include <iostream> #include <chrono> #include <thread> HHOOK g_mouseHook; bool g_isDragging = false; POINT g_dragStartPos = { 0, 0 }; const int DRAG_THRESHOLD = 3; // 拖动阈值（像素） void ExtractFileInfoFromDropClipboard(); void CheckOtherDataFormats(IDataObject* pDataObject); void ExtractFileTypeInfo(const std::wstring& filePath); LRESULT CALLBACK MouseProc(int nCode, WPARAM wParam, LPARAM lParam) { if (nCode == HC_ACTION) { MSLLHOOKSTRUCT* pMouse = (MSLLHOOKSTRUCT*)lParam; if (wParam == WM_LBUTTONDOWN) { //std::cout << "Mouse Button Down at (" << pMouse->pt.x << ", " << pMouse->pt.y << ")\n"; // 你可以在这里检测是否是拖拽开始的条件 // 记录拖动起始位置 g_dragStartPos = pMouse->pt; g_isDragging = false; } if (wParam == WM_MOUSEMOVE) { // 检测鼠标是否有拖拽操作 if (GetAsyncKeyState(VK_LBUTTON) & 0x8000) { // 检查是否超过拖动阈值 int deltaX = abs(pMouse->pt.x - g_dragStartPos.x); int deltaY = abs(pMouse->pt.y - g_dragStartPos.y); if (!g_isDragging && (deltaX > DRAG_THRESHOLD || deltaY > DRAG_THRESHOLD)) { g_isDragging = true; std::cout << "move begin..." << std::endl; // 尝试从拖放剪贴板获取文件信息 ExtractFileInfoFromDropClipboard(); } } } if (wParam == WM_LBUTTONUP) { if (g_isDragging) { std::cout << "move end" << std::endl; g_isDragging = false; } } } return CallNextHookEx(g_mouseHook, nCode, wParam, lParam); } // 从拖放剪贴板提取文件信息 void ExtractFileInfoFromDropClipboard() { HRESULT hr = OleInitialize(nullptr); if (FAILED(hr)) { std::cerr << "OleInitialize failed: " << hr << std::endl; return; } IDataObject* pDataObject = nullptr; // 获取拖放剪贴板数据 hr = OleGetClipboard(&pDataObject); if (SUCCEEDED(hr) && pDataObject) { FORMATETC fmtetc = { CF_HDROP, NULL, DVASPECT_CONTENT, -1, TYMED_HGLOBAL }; if (SUCCEEDED(pDataObject->QueryGetData(&fmtetc))) { STGMEDIUM stgmed; // 查询 HDROP 数据 hr = pDataObject->GetData(&fmtetc, &stgmed); if (SUCCEEDED(hr)) { HDROP hDrop = static_cast<HDROP>(GlobalLock(stgmed.hGlobal)); if (hDrop) { // 获取文件数量 UINT fileCount = DragQueryFile(hDrop, 0xFFFFFFFF, nullptr, 0); std::cout << "drag file count: " << fileCount << std::endl; // 遍历所有文件 for (UINT i = 0; i < fileCount; i++) { // 获取文件路径长度 UINT pathLength = DragQueryFile(hDrop, i, nullptr, 0); if (pathLength > 0) { std::vector<TCHAR> buffer(pathLength + 1); DragQueryFile(hDrop, i, buffer.data(), pathLength + 1); std::wstring filePath(buffer.data()); std::wcout << L"file " << (i + 1) << L": " << filePath << std::endl; // 获取文件属性信息 ExtractFileTypeInfo(filePath); } } GlobalUnlock(stgmed.hGlobal); } ReleaseStgMedium(&stgmed); } } else { std::wcout << L"CF_HDROP format not supported" << std::endl; // 尝试其他数据格式 //CheckOtherDataFormats(pDataObject); } pDataObject->Release(); } else { std::wcerr << L"can not get clipboard data" << std::endl; } OleUninitialize(); } // 检查其他数据格式 void CheckOtherDataFormats(IDataObject* pDataObject) { // 查询支持的数据格式 IEnumFORMATETC* pEnumFormat = nullptr; HRESULT hr = pDataObject->EnumFormatEtc(DATADIR_GET, &pEnumFormat); if (SUCCEEDED(hr) && pEnumFormat) { FORMATETC fmtetc; ULONG fetched = 0; std::cout << "data format in clipboard:" << std::endl; while (pEnumFormat->Next(1, &fmtetc, &fetched) == S_OK && fetched == 1) { TCHAR formatName[256]; if (GetClipboardFormatName(fmtetc.cfFormat, formatName, 256) > 0) { std::wcout << L"format1: " << formatName << L" (ID: " << fmtetc.cfFormat << L")" << std::endl; } else { // 标准格式 std::string stdFormatName; switch (fmtetc.cfFormat) { case CF_TEXT: stdFormatName = "CF_TEXT"; break; case CF_UNICODETEXT: stdFormatName = "CF_UNICODETEXT"; break; case CF_BITMAP: stdFormatName = "CF_BITMAP"; break; case CF_DIB: stdFormatName = "CF_DIB"; break; case CF_HDROP: stdFormatName = "CF_HDROP"; break; case CF_LOCALE: stdFormatName = "CF_LOCALE"; break; case CF_OEMTEXT: stdFormatName = "CF_OEMTEXT"; break; default: stdFormatName = "unknown"; break; } std::cout << "format2: " << stdFormatName << " (ID: " << fmtetc.cfFormat << ")" << std::endl; } } pEnumFormat->Release(); } } // 提取文件类型信息 void ExtractFileTypeInfo(const std::wstring& filePath) { // 获取文件属性 DWORD attr = GetFileAttributes(filePath.c_str()); if (attr != INVALID_FILE_ATTRIBUTES) { if (attr & FILE_ATTRIBUTE_DIRECTORY) { std::wcout << L" type: directory" << std::endl; } else { std::wcout << L" type: file" << std::endl; // 获取文件扩展名 size_t dotPos = filePath.find_last_of(L'.'); if (dotPos != std::wstring::npos) { std::wstring extension = filePath.substr(dotPos); std::wcout << L" extension: " << extension << std::endl; } // 获取文件大小 HANDLE hFile = CreateFile(filePath.c_str(), GENERIC_READ, FILE_SHARE_READ, nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr); if (hFile != INVALID_HANDLE_VALUE) { LARGE_INTEGER fileSize; if (GetFileSizeEx(hFile, &fileSize)) { std::wcout << L" size: " << fileSize.QuadPart << L" bytes" << std::endl; } CloseHandle(hFile); } } // 显示文件属性 std::wcout << L" properties: "; if (attr & FILE_ATTRIBUTE_READONLY) std::wcout << L"[read-only]"; if (attr & FILE_ATTRIBUTE_HIDDEN) std::wcout << L"[hidden]"; if (attr & FILE_ATTRIBUTE_SYSTEM) std::wcout << L"[system]"; if (attr & FILE_ATTRIBUTE_ARCHIVE) std::wcout << L"[archive]"; std::wcout << std::endl; } } void InstallMouseHook() { g_mouseHook = SetWindowsHookEx(WH_MOUSE_LL, MouseProc, NULL, 0); if (g_mouseHook == NULL) { std::cerr << "Failed to install mouse hook!" << std::endl; } } int main() { InstallMouseHook(); // 进入消息循环 MSG msg; while (GetMessage(&msg, NULL, 0, 0)) { TranslateMessage(&msg); DispatchMessage(&msg); } // 卸载钩子 UnhookWindowsHookEx(g_mouseHook); return 0; }