212 lines
6.7 KiB
C++
212 lines
6.7 KiB
C++
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#include "precomp.h"
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#include "shutil.h"
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HRESULT SHStringFromCLSIDA( LPSTR szCLSID, DWORD cSize, REFCLSID rCLSID )
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{
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if ( cSize < 39 )
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{
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return E_INVALIDARG;
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}
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WCHAR szWCLSID[40];
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HRESULT hr = StringFromGUID2( rCLSID, szWCLSID, 40 );
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if ( FAILED( hr ))
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{
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return hr;
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}
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WideCharToMultiByte( CP_ACP, 0, szWCLSID, -1, szCLSID, cSize, 0, 0);
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return hr;
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}
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HRESULT GetFileInfoByHandle(LPCTSTR pszFile, BY_HANDLE_FILE_INFORMATION *pInfo)
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{
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HRESULT hr;
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HANDLE hFile = CreateFile(pszFile, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL);
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if (INVALID_HANDLE_VALUE != hFile)
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{
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if (GetFileInformationByHandle(hFile, pInfo))
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{
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hr = S_OK;
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}
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else
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{
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hr = HRESULT_FROM_WIN32(GetLastError());
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}
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CloseHandle(hFile);
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}
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else
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{
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hr = HRESULT_FROM_WIN32(GetLastError());
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}
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return hr;
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}
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// S_OK -> YES, S_FALSE -> NO, FAILED(hr) otherwise
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STDAPI IsSameFile(LPCTSTR pszFile1, LPCTSTR pszFile2)
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{
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HRESULT hr;
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// use CRT str cmp semantics as localized strcmp should not be used for the file system
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if (0 == StrCmpIC(pszFile1, pszFile2))
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{
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hr = S_OK; // test the names
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}
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else
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{
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// very clever here... we can test for alias names that map to the same
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// file. for example the short name vs long name of the same file
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// the UNC name vs drive letter version of the name
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BY_HANDLE_FILE_INFORMATION hfi1;
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hr = GetFileInfoByHandle(pszFile1, &hfi1);
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if (SUCCEEDED(hr))
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{
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BY_HANDLE_FILE_INFORMATION hfi2;
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hr = GetFileInfoByHandle(pszFile2, &hfi2);
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if (SUCCEEDED(hr))
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{
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if (hfi1.dwVolumeSerialNumber == hfi2.dwVolumeSerialNumber &&
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hfi1.nFileIndexHigh == hfi2.nFileIndexHigh &&
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hfi1.nFileIndexLow == hfi2.nFileIndexLow)
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{
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hr = S_OK; // same!
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}
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else
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{
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hr = S_FALSE; // different
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}
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}
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}
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}
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return hr;
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}
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UINT FindInDecoderList(ImageCodecInfo *pici, UINT cDecoders, LPCTSTR pszFile)
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{
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LPCTSTR pszExt = PathFindExtension(pszFile); // speed up PathMatchSpec calls
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// look at the list of decoders to see if this format is there
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for (UINT i = 0; i < cDecoders; i++)
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{
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if (PathMatchSpec(pszExt, pici[i].FilenameExtension))
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return i;
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}
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return (UINT)-1; // not found!
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}
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HRESULT GetUIObjectFromPath(LPCTSTR pszFile, REFIID riid, void **ppv)
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{
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*ppv = NULL;
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LPITEMIDLIST pidl;
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HRESULT hr = SHILCreateFromPath(pszFile, &pidl, NULL);
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if (SUCCEEDED(hr))
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{
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hr = SHGetUIObjectFromFullPIDL(pidl, NULL, riid, ppv);
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ILFree(pidl);
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}
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return hr;
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}
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BOOL FmtSupportsMultiPage(IShellImageData *pData, GUID *pguidFmt)
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{
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BOOL bRet = FALSE;
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EncoderParameters *pencParams;
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if (SUCCEEDED(pData->GetEncoderParams(pguidFmt, &pencParams)))
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{
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for (UINT i=0;!bRet && i<pencParams->Count;i++)
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{
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if (EncoderSaveFlag == pencParams->Parameter[i].Guid)
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{
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if (EncoderValueMultiFrame == *((ULONG*)pencParams->Parameter[i].Value))
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{
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bRet = TRUE;
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}
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}
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}
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CoTaskMemFree(pencParams);
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}
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return bRet;
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}
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HRESULT SetWallpaperHelper(LPCWSTR pszPath)
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{
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IActiveDesktop* pad;
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HRESULT hr = CoCreateInstance(CLSID_ActiveDesktop, NULL, CLSCTX_INPROC, IID_PPV_ARG(IActiveDesktop, &pad));
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if (SUCCEEDED(hr))
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{
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IShellImageDataFactory* pidf;
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hr = CoCreateInstance(CLSID_ShellImageDataFactory, NULL, CLSCTX_INPROC, IID_PPV_ARG(IShellImageDataFactory, &pidf));
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if (SUCCEEDED(hr))
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{
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IShellImageData* pid;
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hr = pidf->CreateImageFromFile(pszPath, &pid);
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if (SUCCEEDED(hr))
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{
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hr = pid->Decode(SHIMGDEC_DEFAULT, 0,0);
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if (SUCCEEDED(hr))
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{
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// we are basing this on a best fit to the primary screen
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ULONG cxScreen = GetSystemMetrics(SM_CXSCREEN);
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ULONG cyScreen = GetSystemMetrics(SM_CYSCREEN);
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SIZE szImg;
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pid->GetSize(&szImg);
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hr = pad->SetWallpaper(pszPath, 0);
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if (SUCCEEDED(hr))
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{
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WALLPAPEROPT wpo;
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wpo.dwSize = sizeof(wpo);
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wpo.dwStyle = WPSTYLE_CENTER;
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// if the image is small on either axis then tile
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if (((ULONG)szImg.cx*2 < cxScreen) || ((ULONG)szImg.cy*2 < cyScreen))
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{
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wpo.dwStyle = WPSTYLE_TILE;
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}
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// if the image is larger than the screen then stretch
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else if ((ULONG)szImg.cx > cxScreen && (ULONG)szImg.cy > cyScreen)
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{
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wpo.dwStyle = WPSTYLE_STRETCH;
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}
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else
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{
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// If the aspect ratio matches the screen then stretch.
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// I'm checking is the aspect ratios are *close* to matching.
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// Here's the logic behind this:
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//
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// a / b == c / d
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// a * d == c * b
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// (a * d) / (c * b) == 1
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// 0.75 <= (a * d) / (c * b) < 1.25 <-- our *close* factor
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// 3 <= 4 * (a * d) / (c * b) < 5
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//
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// We do an integer division which will floor the result meaning
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// that if the result is 3 or 4 we are inside the rang we want.
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DWORD dwRes = (4 * (ULONG)szImg.cx * cyScreen) / (cxScreen * (ULONG)szImg.cy);
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if (dwRes == 4 || dwRes == 3)
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wpo.dwStyle = WPSTYLE_STRETCH;
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}
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hr = pad->SetWallpaperOptions(&wpo, 0);
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if (SUCCEEDED(hr))
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{
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hr = pad->ApplyChanges(AD_APPLY_ALL | AD_APPLY_DYNAMICREFRESH);
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}
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}
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}
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pid->Release();
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}
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pidf->Release();
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}
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pad->Release();
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}
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return hr;
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}
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