124 lines
3.8 KiB
C++
124 lines
3.8 KiB
C++
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#include "priv.h"
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#include "icotask.h"
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// {EB30900C-1AC4-11d2-8383-00C04FD918D0}
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static const GUID TASKID_IconExtraction =
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{ 0xeb30900c, 0x1ac4, 0x11d2, { 0x83, 0x83, 0x0, 0xc0, 0x4f, 0xd9, 0x18, 0xd0 } };
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CIconTask::CIconTask(LPITEMIDLIST pidl, PFNICONTASKBALLBACK pfn, LPVOID pvData, UINT uId):
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_pidl(pidl), _pfn(pfn), _pvData(pvData), _uId(uId), CRunnableTask(RTF_DEFAULT)
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{
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}
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CIconTask::~CIconTask()
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{
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if (_pidl)
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ILFree(_pidl);
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}
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// IRunnableTask methods (override)
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STDMETHODIMP CIconTask::RunInitRT(void)
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{
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int iIndex = -1;
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IShellFolder* psf;
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LPCITEMIDLIST pidlItem;
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// We need to rebind because shell folders may not be thread safe.
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HRESULT hres = IEBindToParentFolder(_pidl, &psf, &pidlItem);
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if (SUCCEEDED(hres))
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{
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iIndex = SHMapPIDLToSystemImageListIndex(psf, pidlItem, NULL);
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psf->Release();
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}
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_pfn(_pvData, _uId, iIndex);
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return S_OK; // return S_OK even if we don't get an icon.
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}
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// NOTE: If you pass NULL for psf and pidlFolder, you must pass a full pidl which
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// the API takes ownership of. (This is an optimization) lamadio - 7.28.98
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HRESULT AddIconTask(IShellTaskScheduler* pts, IShellFolder* psf, LPCITEMIDLIST pidlFolder,
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LPCITEMIDLIST pidl, PFNICONTASKBALLBACK pfn, LPVOID pvData,
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UINT uId, int* piTempIcon)
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{
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if (!pts)
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return E_INVALIDARG;
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HRESULT hres = E_PENDING;
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TCHAR szIconFile[MAX_PATH];
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// The shell has a concept of GIL_ASYNC which means that an extension called with this flag
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// should not really load the target file, it should "Fake" it, returning an icon for the type.
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// Later, on a background thread, we're going to call it again without the GIL_ASYNC, and at
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// that time, it should really extract the icon.
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// This is an optimiation for slow icon extraction, such as network shares
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// NOTE: There is significant overhead to actually loading the shell extension. If you know the
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// type of the item, pass NULL to piTempIcopn
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if (piTempIcon)
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{
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*piTempIcon = -1;
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UINT uFlags;
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IExtractIconA* pixa;
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IExtractIconW* pix;
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if (SUCCEEDED(psf->GetUIObjectOf(NULL, 1, (LPCITEMIDLIST*)&pidl, IID_IExtractIconW, NULL, (LPVOID*)&pix)))
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{
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hres = pix->GetIconLocation(GIL_FORSHELL | GIL_ASYNC,
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szIconFile, ARRAYSIZE(szIconFile), piTempIcon, &uFlags);
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pix->Release();
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}
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else if (SUCCEEDED(psf->GetUIObjectOf(NULL, 1,(LPCITEMIDLIST*)&pidl, IID_IExtractIconA, NULL, (LPVOID*)&pixa)))
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{
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char szIconFileA[MAX_PATH];
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hres = pixa->GetIconLocation(GIL_FORSHELL | GIL_ASYNC,
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szIconFileA, ARRAYSIZE(szIconFileA), piTempIcon, &uFlags);
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SHAnsiToUnicode(szIconFileA, szIconFile, ARRAYSIZE(szIconFile));
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pixa->Release();
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}
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}
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if (hres == E_PENDING)
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{
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if (piTempIcon)
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*piTempIcon = Shell_GetCachedImageIndex(szIconFile, *piTempIcon, 0);
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LPITEMIDLIST pidlFull;
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if (psf)
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pidlFull = ILCombine(pidlFolder, pidl);
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else
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pidlFull = (LPITEMIDLIST)pidl;
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hres = E_OUTOFMEMORY;
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CIconTask* pit = new CIconTask(pidlFull, pfn, pvData, uId);
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// Don't ILFree(pidlFull) because CIconTask takes ownership.
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// BUGBUG (lamadio) Remove this from the memory list. Ask Saml how to do this
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// for the IMallocSpy stuff.
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if (pit)
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{
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hres = pts->AddTask(SAFECAST(pit, IRunnableTask*), TASKID_IconExtraction,
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ITSAT_DEFAULT_LPARAM, ITSAT_DEFAULT_PRIORITY);
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pit->Release();
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}
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}
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else
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{
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*piTempIcon = SHMapPIDLToSystemImageListIndex(psf, pidl, NULL);
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hres = S_OK;
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}
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return hres;
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}
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