COM：The Open Dialog Box

最新推荐文章于 2023-03-23 10:12:23 发布

theForger

最新推荐文章于 2023-03-23 10:12:23 发布

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分类专栏： Windows 文章标签： com OpenDialog QueryInter CComPtr

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本文介绍如何使用COM组件创建并显示文件打开对话框，包括初始化COM库、创建IFileOpenDialog实例、显示对话框及获取选定文件路径等步骤。

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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;
    }

这里写图片描述

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;
}