从UWP应用程序中提取图标 [英] Extract icon from UWP application

问题描述

在尝试实现打开方式功能时，我遇到了从UWP应用程序中提取图标的问题。因此，在收到 SHAssocEnumHandlers ，我试图在 IAssocHandler :: GetIconLocation 和经典 ExtractIcon（）。例如，像Paint这样的程序一切正常。我有绘制二进制文件的完整路径，可以从中提取图标。但是使用像3D builder，Photos和其他UWP应用程序获得的图标位置看起来像 @ {Microsoft.Windows.Photos_16.511.8630.0_x64__8wekyb3d8bbwe？ms-resource：//Microsoft.Windows.Photos /Files/Assets/PhotosAppList.png} 。我尝试了几个不同的API来提取图标，每次收到FILE_NOT_FOUND错误。那么，有人可以给我一个提示，在这种情况下可以用哪个函数来提取图标吗？

While trying to implement "Open With" functionality I encountered a problem with extracting icons from UWP applications. So, after receiving list of recommended applications to open particular file with the help of SHAssocEnumHandlers, I'm trying to extract icons for each of these applications with the help of IAssocHandler::GetIconLocation and classical ExtractIcon(). Everything works ok with programs like Paint, for example. I have full path to Paint binary and can extract icon from it. But with applications like "3D builder", "Photos" and other UWP applications obtained icon location looks like @{Microsoft.Windows.Photos_16.511.8630.0_x64__8wekyb3d8bbwe?ms-resource://Microsoft.Windows.Photos/Files/Assets/PhotosAppList.png}. I tried couple of different APIs to extract icon and each time received FILE_NOT_FOUND error. So, can anyone give me a hint which function can be used to extract icon in that case?

更新
某些部分添加源代码以澄清情况：

UPDATE Some parts of source code added to clarify the situation:

// m_handlers is a member of type std::vector<CComPtr<IAssocHandler>>

HRESULT FileManager::GetAssocHandlers(const std::wstring& strFileExtension, ASSOC_FILTER filter)
{
    HRESULT hr = S_OK;
    CComPtr<IEnumAssocHandlers> enumerator;

    m_handlers.clear();

    hr = SHAssocEnumHandlers(strFileExtension.c_str(), filter, &enumerator);
    if (SUCCEEDED(hr))
    {
        for (CComPtr<IAssocHandler> handler;
            enumerator->Next(1, &handler, nullptr) == S_OK;
            handler.Release())
        {
            m_handlers.push_back(handler);
        }
    }

    return hr;
}

HRESULT FileManager::GetAssociatedPrograms(BSTR bstrFileName, BSTR* bstrRet)
{
    ...
    hr = GetAssocHandlers(strFileExtension, ASSOC_FILTER_RECOMMENDED);
    if (SUCCEEDED(hr))
    {
        ...
        for (auto& handler : m_handlers)
        {
            ...
            if (SUCCEEDED(handler->GetIconLocation(&tmpStr, &resourceIndex)))
            {
                // And this is where I get classic full file path to regular
                // applications like "MS Paint" or this weird path mentioned
                // above for "Photos" UWP application for example which can't
                // be used in regular ExtractIcon functions.
            }
        }
    }
}

推荐答案

看起来我找到了解决方案。根据MSDN，为UWP应用程序提供的图标位置路径称为间接字符串。我们可以将此间接字符串传递给 SHLoadIndirectString 功能，将接收图标PNG文件的常规完整路径。在我的情况下传递 @ {Microsoft.Windows.Photos_16.511.8630.0_x64__8wekyb3d8bbwe？ms-resource：//Microsoft.Windows.Photos/Files/Assets/PhotosAppList.png} 到SHLoadIndirectString（）我收到这样的路径： C：\Program Files\WindowsApps\Microsoft.Windows.Photos_16.511.8630.0_neutral_split.scale-125_8wekyb3d8bbwe \Assets\PhotosAppList.scale-125 .png 之后我可以用它来显示图标本身没有问题。

Looks like I've found the solution. The icon location path provided for UWP application is called "indirect string" according to MSDN. We can pass this indirect string to SHLoadIndirectString function and will receive the regular full path to the icon PNG file. In my case after passing @{Microsoft.Windows.Photos_16.511.8630.0_x64__8wekyb3d8bbwe?ms-resource://Microsoft.Windows.Photos/Files/Assets/PhotosAppList.png} to SHLoadIndirectString() I received path like that: C:\Program Files\WindowsApps\Microsoft.Windows.Photos_16.511.8630.0_neutral_split.scale-125_8wekyb3d8bbwe\Assets\PhotosAppList.scale-125.png and after that I can use it to display the icon itself w/o any problem.

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