调用TOpenPictureDialog选择大量图片时候发现，返回的Files里面只有前面的一千多个文件，实际只有我选择文件的一半左右。开始以为 是CB的BUG，于是把OpenDialog源码中的MultiSelectBufferSize改大，测试没效果。网上有人 说，GetOpenFileName的Ansi版本有32K内存限制，Unicode版本没有限制。实际我的程序已经是Unicode的了。Ansi的 API只是进行的字符转换，之后还是调用Unicode版本的API，所以这个方法行不通。
在一个博客里面介绍，可以通过Shell接口自己获取选择的文件，有参考代码，这就好办了，有了解决问题的方向。那 怎么加入CB中呢，直接调用GetOpenFileName？ 重写TOpenDialog？都太麻烦了，打开源码，发现有TOpenDialog有个函数void __fastcall GetFileNames(tagOFNW &OpenFileName)是用来取得所选文件的，正好就改它了。这里给出改好的代码，加入工程源码中就可以。- C/C++ code
- #include <shlobj.h> #ifndef WM_GETISHELLBROWSER #define WM_GETISHELLBROWSER (WM_USER+7)#endif#define GetPIDLFolder(pida) (LPCITEMIDLIST)(((LPBYTE)pida)+(pida)->aoffset[0])#define GetPIDLItem(pida, i) (LPCITEMIDLIST)(((LPBYTE)pida)+(pida)->aoffset[i+1]) BOOL ILIsFile(LPCITEMIDLIST pidl) { BOOL bRet = FALSE; LPCITEMIDLIST pidlChild = NULL; IShellFolder* psf = NULL; HRESULT hr = SHBindToParent(pidl, IID_IShellFolder, (LPVOID*) & psf, &pidlChild); if (SUCCEEDED(hr) && psf) { SFGAOF rgfInOut = SFGAO_FOLDER | SFGAO_FILESYSTEM; hr = psf->GetAttributesOf(1, &pidlChild, &rgfInOut); if (SUCCEEDED(hr)) { if ((~rgfInOut & SFGAO_FOLDER) && (rgfInOut & SFGAO_FILESYSTEM)) { bRet = TRUE; } } psf->Release(); } return bRet; } void __fastcall TOpenDialog::GetFileNames(tagOFNW &OpenFileName) { static TStringList *lst =new TStringList; FORMATETC fmte; STGMEDIUM stgmedium; LPITEMIDLIST pidlFull = NULL; IShellView * pIShellView = NULL; LPMALLOC pMalloc = NULL; IDataObject* pIDataObject = NULL; IShellBrowser* pSB = (IShellBrowser*)SendMessage(GetParent(Handle), WM_GETISHELLBROWSER, 0, 0); TCHAR szPath[_MAX_PATH]; if (pSB == NULL) //GetFileNames被调用两次,第二次pSB为空, 返回第一次结果 { if (lst) { FFileName = lst->Count >0? lst->Strings[0] : String(""); FFiles->Assign(lst); delete lst; lst = NULL; } return; } if (lst == NULL) lst =new TStringList; ZeroMemory((LPVOID) & fmte, sizeof(STGMEDIUM)); ZeroMemory((LPVOID) & fmte, sizeof(FORMATETC)); fmte.tymed = TYMED_HGLOBAL; fmte.lindex =-1; fmte.dwAspect = DVASPECT_CONTENT; fmte.cfFormat = RegisterClipboardFormat(CFSTR_SHELLIDLIST); do { HRESULT hr = pSB->QueryActiveShellView(&pIShellView); if (FAILED(hr)) break; hr = ::SHGetMalloc(&pMalloc); if (FAILED(hr)) break; hr = pIShellView->GetItemObject(SVGIO_SELECTION, IID_IDataObject, (LPVOID*) & pIDataObject); if (FAILED(hr)) break; if (pIDataObject == NULL) break; hr = pIDataObject->GetData(&fmte, &stgmedium); if (FAILED(hr)) break; LPIDA pida = (LPIDA)GlobalLock(stgmedium.hGlobal); if (pida) { LPCITEMIDLIST pidlFolder = GetPIDLFolder(pida); for (UINT i =0; i < pida->cidl; i++) { LPCITEMIDLIST pidl = GetPIDLItem(pida, i); pidlFull = ILCombine(pidlFolder, pidl); if (ILIsFile(pidlFull)) { ZeroMemory(szPath, sizeof(TCHAR) * _MAX_PATH); hr = SHGetPathFromIDList(pidlFull, szPath); if (SUCCEEDED(hr)) { lst->Add((szPath)); } } pMalloc->Free(pidlFull); pidlFull = NULL; } } GlobalUnlock(stgmedium.hGlobal); ReleaseStgMedium(&stgmedium); } while (FALSE); if (pIDataObject) pIDataObject->Release(); if (pIShellView) pIShellView->Release(); if (pMalloc) { if (pidlFull) pMalloc->Free(pidlFull); pMalloc->Release(); } }