COM：The Open Dialog Box

如何使用com组件创建打开对话框

    #include <windows.h>#include <shobjidl.h> int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE, PWSTR pCmdLine, int nCmdShow){HRESULT hr = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED | COINIT_DISABLE_OLE1DDE);if (SUCCEEDED(hr)){IFileOpenDialog *pFileOpen;// Create the FileOpenDialog object.hr = CoCreateInstance(CLSID_FileOpenDialog, NULL, CLSCTX_ALL, IID_IFileOpenDialog, reinterpret_cast<void**>(&pFileOpen));if (SUCCEEDED(hr)){// Show the Open dialog box.hr = pFileOpen->Show(NULL);// Get the file name from the dialog box.if (SUCCEEDED(hr)){IShellItem *pItem;hr = pFileOpen->GetResult(&pItem);if (SUCCEEDED(hr)){PWSTR pszFilePath;hr = pItem->GetDisplayName(SIGDN_FILESYSPATH, &pszFilePath);// Display the file name to the user.if (SUCCEEDED(hr)){MessageBox(NULL, pszFilePath, L"File Path", MB_OK);CoTaskMemFree(pszFilePath);}pItem->Release();}}pFileOpen->Release();}CoUninitialize();}return 0;}

使用ATL智能指针CComPtr实现

#include <windows.h>
#include <shobjidl.h>
#include <atlbase.h> // Contains the declaration of CComPtr.int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE, PWSTR pCmdLine, int nCmdShow)
{HRESULT hr = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED | COINIT_DISABLE_OLE1DDE);if (SUCCEEDED(hr)){CComPtr<IFileOpenDialog> pFileOpen;// Create the FileOpenDialog object.hr = pFileOpen.CoCreateInstance(__uuidof(FileOpenDialog));if (SUCCEEDED(hr)){// Show the Open dialog box.hr = pFileOpen->Show(NULL);// Get the file name from the dialog box.if (SUCCEEDED(hr)){CComPtr<IShellItem> pItem;hr = pFileOpen->GetResult(&pItem);if (SUCCEEDED(hr)){PWSTR pszFilePath;hr = pItem->GetDisplayName(SIGDN_FILESYSPATH, &pszFilePath);// Display the file name to the user.if (SUCCEEDED(hr)){MessageBox(NULL, pszFilePath, L"File Path", MB_OK);CoTaskMemFree(pszFilePath);}}// pItem goes out of scope.}// pFileOpen goes out of scope.}CoUninitialize();}return 0;
}

Asking an Object for an Interface: https://msdn.microsoft.com/en-us/library/ff485837(v=vs.85).aspx

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COM：The Open Dialog Box

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