在C/C++中，可以有以下两种办法
使用COM接口IThumbnailCache
文档链接：https://learn.microsoft.com/en-us/windows/win32/api/thumbcache/nn-thumbcache-ithumbnailcache
示例代码如下：
VOID GetFileThumbnail(PCWSTR path){ HRESULT hr = CoInitialize(nullptr);
IShellItem* item = nullptr; hr = SHCreateItemFromParsingName(path, nullptr, IID_PPV_ARGS(&item));
IThumbnailCache* cache = nullptr; hr = CoCreateInstance( CLSID_LocalThumbnailCache, nullptr, CLSCTX_INPROC, IID_PPV_ARGS(&cache));
WTS_CACHEFLAGS flags = WTS_LOWQUALITY; ISharedBitmap* shared_bitmap; hr = cache->GetThumbnail( item, 12*16, WTS_EXTRACT, &shared_bitmap, nullptr, nullptr);
HBITMAP hbitmap = NULL; hr = shared_bitmap->GetSharedBitmap(&hbitmap); shared_bitmap->Release(); cache->Release(); CoUninitialize();
DeleteObject(hbitmap);
}
前面我一直使用的这种方式，但是最近系统升级后，会报 Generic Error in GDI+
后面我升级成了下面这种方式：
使用IShellItemImageFactory接口
文档链接：https://learn.microsoft.com/en-us/windows/win32/api/shobjidl_core/nn-shobjidl_core-ishellitemimagefactory
官方示例代码：https://github.com/microsoft/Windows-classic-samples/blob/main/Samples/Win7Samples/winui/shell/appplatform/UsingImageFactory/ImageFactorySample.cpp
HRESULT hr = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED | COINIT_DISABLE_OLE1DDE); HBITMAP hbmp = NULL;
if (SUCCEEDED(hr)) { IShellItemImageFactory* pImageFactory; hr = SHCreateItemFromParsingName(path, NULL, IID_PPV_ARGS(&pImageFactory)); if (SUCCEEDED(hr)) { SIZE size = { 256, 256 }; hr = pImageFactory->GetImage(size, SIIGBF_THUMBNAILONLY, &hbmp); pImageFactory->Release(); } CoUninitialize();
DeleteObject(hbmp); }
在C#中使用，可以直接nuget引用 WindowsAPICodePack-Shell 包
PM> NuGet\Install-Package WindowsAPICodePack-Shell -Version 1.1.1
然后用下面的代码就可以获取文件缩略图
ShellFile shellFile = ShellFile.FromFilePath(filepath);Bitmap shellThumb = shellFile.Thumbnail.ExtraLargeBitmap;
该文章在 2025/10/22 9:28:47 编辑过
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