I have a helper method that looks like this:
HRESULT DeleteFolderAndContainedFiles(IShellItem *psiFolder)
{
IFileOperation *pfo;
HRESULT hr = CreateAndInitializeFileOperation(IID_PPV_ARGS(&pfo));
if (SUCCEEDED(hr))
{
hr = pfo->DeleteItem(psiFolder, NULL);
if (SUCCEEDED(hr))
{
hr = pfo->PerformOperations();
}
pfo->Release();
}
return hr;
}
How can I call this method, using IShellItem (which I have no experience with)? I want to pass it a path like C:\data\test and it should clear everything under the test directory but not delete the test directory.
IShellItem* item = NULL;
SHCreateItemFromParsingName(L"C:\\data\\test", NULL, IID_PPV_ARGS(&item));
Since you do not want to delete the specified folder itself, only its contents, you will have to enumerate the folder's contents and delete them individually. Try calling IShellItem::BindToHandler(BHID_EnumItems) to get an IEnumShellItems that represents the contents and pass it to IFileOperation::DeleteItems(), rather than passing the IShellItem itself to IFileOperation::DeleteItem():
hr = psiFolder->BindToHandler(NULL, BHID_EnumItems, IID_IEnumShellItems, (void**)&pEnum);
if (SUCCEEDED(hr))
{
hr = pfo->DeleteItems(pEnum);
if (SUCCEEDED(hr))
{
hr = pfo->PerformOperations();
}
}
Related
Actually I belive that this problem is easy to solve. It only needs a minor correction. This is the first time that I use Windows Imaging Component (WIC). I am trying to display a PNG picture in my window using Win32 or the Windows API as Microsoft likes to call it. I have written code to initialize it. It requires many steps. I have included a PNG image in my .exe file. Maybe you can look at my code to see what is missing:
void ShowImage() {
IWICBitmapDecoder** ppIDecoder;
IStream* pIStream;
HRESULT hr;
ID2D1RenderTarget* pRenderTarget;
IWICImagingFactory* pIWICFactory = 0;
PCWSTR resourceName, resourceType;
UINT destinationWidth;
UINT destinationHeight;
ID2D1Bitmap** ppBitmap;
IWICBitmapDecoder* pDecoder = NULL;
IWICBitmapFrameDecode* pSource = NULL;
IWICBitmapSource* pISource;
IWICStream* pStream = NULL;
IWICFormatConverter* pConverter = NULL;
IWICBitmapScaler* pScaler = NULL;
HRSRC imageResHandle = NULL;
HGLOBAL imageResDataHandle = NULL;
void* pImageFile = NULL;
DWORD imageFileSize = 0;
// Locate the resource. Aaahhh I should have called Makeintresource and written "PNG"
imageResHandle = FindResource(hInst, MAKEINTRESOURCE(103), L"PNG");
hr = imageResHandle ? S_OK : E_FAIL;
if (SUCCEEDED(hr)) {
// Load the resource.
imageResDataHandle = LoadResource(hInst, imageResHandle);
hr = imageResDataHandle ? S_OK : E_FAIL;
}
if (SUCCEEDED(hr)) {
// Lock it to get a system memory pointer.
pImageFile = LockResource(imageResDataHandle);
hr = pImageFile ? S_OK : E_FAIL;
}
if (SUCCEEDED(hr)) {
// Calculate the size.
imageFileSize = SizeofResource(hInst, imageResHandle);
hr = imageFileSize ? S_OK : E_FAIL;
}
// call coinitialize IWICImagingFactory
if(SUCCEEDED(hr))
hr = CoInitializeEx(0, COINIT_MULTITHREADED);
// Create WIC factory
if (SUCCEEDED(hr)) {
hr = CoCreateInstance(CLSID_WICImagingFactory,
NULL,
CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&pIWICFactory)
);
}
if (SUCCEEDED(hr)) {
// Create a WIC stream to map onto the memory.
hr = pIWICFactory->CreateStream(&pStream);
}
if (SUCCEEDED(hr)) {
// Initialize the stream with the memory pointer and size.
hr = pStream->InitializeFromMemory(reinterpret_cast <BYTE*>(pImageFile),
imageFileSize);
}
if (SUCCEEDED(hr)) {
// Create a decoder for the stream.
--->hr = pIWICFactory->CreateDecoderFromStream(pStream, 0, WICDecodeMetadataCacheOnLoad, ppIDecoder);
}
}
I tried the above code which compiles without errors. All the function calls succeed except the last one that I marked with --->. Then the debugger shows a runtime exception because "The variable 'ppIDecoder' is being used without being initialized."
How do I initialize ppIDecoder?
As said, this problem should be quick to solve.
I am perplexed on whether IFileDialog has the capability of programmatically selecting an item inside the dialog even with out the user selecting.
Ex.
I was hoping to achieve opening IFileDialog then selecting a default item/folder inside the dialog.
Ex.
By the way, in the picture above. I did manually click/select the folder.
But I was hoping to implement a defaultly selected item inside the IFileDialog.
The procedure suggested by zett42 works. You need to implement your own version of IFileDialogEvents. After hooking with IFileDialog::Advise you can query your way to IShellView and that lets you change the selection.
This example is a little silly because I'm forcing the directory as well to be sure I have a file I can select.
struct MyIFileDialogEvents : public IFileDialogEvents {
bool forcedDir, forcedSel;
MyIFileDialogEvents() : forcedDir(false), forcedSel(false) {}
...
};
STDMETHODIMP MyIFileDialogEvents::OnFolderChanging( IFileDialog *pfd, IShellItem*psiFolder)
{
if (forcedDir) return S_OK; else forcedDir = true;
IShellItem*psiwindir;
HRESULT hr = SHGetKnownFolderItem(FOLDERID_Windows, KF_FLAG_DEFAULT, NULL, IID_IShellItem, (void**) &psiwindir);
if (!hr)
{
hr = pfd->SetFolder(psiwindir); // MSDN says it is OK to change the folder in OnFolderChanging with SetFolder
psiwindir->Release();
}
if (FAILED(hr)) forcedSel = true;
return S_OK;
}
STDMETHODIMP MyIFileDialogEvents::OnFolderChange(IFileDialog *pfd)
{
if (forcedSel || !forcedDir) return S_OK; else forcedSel = true;
IShellItem*psiwindir, *psiexp;
HRESULT hr = SHGetKnownFolderItem(FOLDERID_Windows, KF_FLAG_DEFAULT, NULL, IID_IShellItem, (void**) &psiwindir);
if (!hr)
{
hr = SHCreateItemFromRelativeName(psiwindir, L"Explorer.exe", NULL, IID_IShellItem, (void**) &psiexp);
psiwindir->Release();
if (!hr)
{
IServiceProvider*pSP;
IShellBrowser*pSB;
IShellView*pSV;
if (!pfd->QueryInterface(IID_IServiceProvider, (void**) &pSP))
{
if (!pSP->QueryService(SID_STopLevelBrowser, IID_IShellBrowser, (void**)&pSB))
{
if (!pSB->QueryActiveShellView(&pSV))
{
PIDLIST_ABSOLUTE pidl;
if (!SHGetIDListFromObject(psiexp, &pidl))
{
pSV->SelectItem(ILFindLastID(pidl), SVSI_SELECT|SVSI_ENSUREVISIBLE|SVSI_FOCUSED|SVSI_DESELECTOTHERS);
CoTaskMemFree(pidl);
}
pSV->Release();
}
pSB->Release();
}
pSP->Release();
}
psiexp->Release();
}
}
return S_OK;
}
By using Microsoft windows SDK 7.0, explorerDataProvider, I installed a virtual folder on windows 7.
When I open the file browse dialog from an application,
CFileDialog dlg(TRUE, NULL, 0, OFN_ENABLESIZING | OFN_ALLOWMULTISELECT, L"all(*.*)|*.*||", this);
INT_PTR result = dlg.DoModal();
if (result == IDOK)
{
.
.
.
//some actions
}
it can also display the virtual folder:
But when I select the file, like "Zero" can then clicks "Open",
I tried to add breakpoints to
INT_PTR result = dlg.DoModal();
But it seems that this error happens inside DoModal().
I doing some research and revise the code of virtual folder:
HRESULT CFolderViewImplFolder::GetAttributesOf(UINT cidl, PCUITEMID_CHILD_ARRAY apidl, ULONG *rgfInOut)
{
// If SFGAO_FILESYSTEM is returned, GetDisplayNameOf(SHGDN_FORPARSING) on that item MUST
// return a filesystem path.
HRESULT hr = E_INVALIDARG;
DWORD dwAttribs = 0;
dwAttribs |= SFGAO_BROWSABLE;
if (1 == cidl)
{
int nLevel = 0;
hr = _GetLevel(apidl[0], &nLevel);
if (SUCCEEDED(hr))
{
BOOL fIsFolder = FALSE;
hr = _GetFolderness(apidl[0], &fIsFolder);
if (SUCCEEDED(hr))
{
if (fIsFolder)
{
dwAttribs |= SFGAO_FOLDER;
dwAttribs |= SFGAO_FILESYSANCESTOR;
}
else
{
dwAttribs |= SFGAO_SYSTEM;
dwAttribs |= SFGAO_FILESYSTEM;
}
if (nLevel < g_nMaxLevel)
{
dwAttribs |= SFGAO_HASSUBFOLDER;
}
}
}
}
*rgfInOut &= dwAttribs;
return hr;
}
And return the path inGetDisplayNameOf()
HRESULT CFolderViewImplFolder::GetDisplayNameOf(PCUITEMID_CHILD pidl, SHGDNF shgdnFlags, STRRET *pName)
{
HRESULT hr = S_OK;
if (shgdnFlags & SHGDN_FORPARSING)
{
WCHAR szDisplayName[MAX_PATH];
if (shgdnFlags & SHGDN_INFOLDER)
{
// This form of the display name needs to be handled by ParseDisplayName.
hr = _GetName(pidl, szDisplayName, ARRAYSIZE(szDisplayName));
}
else
{
PWSTR pszThisFolder = L"Computer\\Jerry";
StringCchCopy(szDisplayName, ARRAYSIZE(szDisplayName), pszThisFolder);
StringCchCat(szDisplayName, ARRAYSIZE(szDisplayName), L"\\");
WCHAR szName[MAX_PATH];
hr = _GetName(pidl, szName, ARRAYSIZE(szName));
if (SUCCEEDED(hr))
{
StringCchCat(szDisplayName, ARRAYSIZE(szDisplayName), szName);
}
}
if (SUCCEEDED(hr))
{
hr = StringToStrRet(szDisplayName, pName);
}
}
else
{
PWSTR pszName;
hr = _GetName(pidl, &pszName);
if (SUCCEEDED(hr))
{
hr = StringToStrRet(pszName, pName);
CoTaskMemFree(pszName);
}
}
return hr;
}
But it still stats error message of "Path does not exist" in the application.
I add breakpoints in GetDisplayNameOf, but it is never triggered when the application opens a file browse dialog. But if I open a regular folder just by double click "Computer", it will be triggered.
The error message of "Path does not exist" seems cannot be deprecated or covered. Any way that I can revise the virtual folder to return the correct path ?
Update: I tried IFileDialog, I copied the code from the MSDN sample, code, and add breakpoints to see what will happen. However,
// Show the dialog
hr = pfd->Show(NULL);//the breakpoint is added here
if (SUCCEEDED(hr))
{
// Obtain the result once the user clicks
// the 'Open' button.
// The result is an IShellItem object.
IShellItem *psiResult;
hr = pfd->GetResult(&psiResult);
if (SUCCEEDED(hr))
{
//do something
}
}
When I click "Open" button, the error message box of "Path does not exist, check the path and try again" still show up. And it never comes out of pfd->Show(NULL) after I click Open" button.
Based on the comments in the sample code, it should come out of hr = pfd->Show(NULL); and reach to the next line.but the error message happens inside the hr = pfd->Show(NULL);.
Update:
In the IFileDialog, I tried
hr = pfd->GetOptions(&dwFlags);
if (SUCCEEDED(hr))
{
hr = pfd->SetOptions(dwFlags | FOS_ALLNONSTORAGEITEMS);
if (SUCCEEDED(hr))
{
// Show the dialog
hr = pfd->Show(NULL);
if (SUCCEEDED(hr))
{
// Obtain the result once the user clicks
// the 'Open' button.
// The result is an IShellItem object.
IShellItem *psiResult;
hr = pfd->GetResult(&psiResult);
if (SUCCEEDED(hr))
{
// We are just going to print out the
// name of the file for sample sake.
PWSTR pszFilePath = NULL;
hr = psiResult->GetDisplayName(SIGDN_FILESYSPATH,
&pszFilePath);
if (SUCCEEDED(hr))
{
TaskDialog(NULL,
NULL,
L"CommonFileDialogApp",
pszFilePath,
NULL,
TDCBF_OK_BUTTON,
TD_INFORMATION_ICON,
NULL);
CoTaskMemFree(pszFilePath);
}
psiResult->Release();
}
}
}
I also tried
hr = pfd->SetOptions(dwFlags);//delete FOS_FORCEFILESYSTEM
And tried
DWORD dwFlags = 0;
if (SUCCEEDED(hr))
{
// overwrite options completely
hr = pfd->SetOptions(dwFlags | FOS_ALLNONSTORAGEITEMS);
I also tried to return the whole name in namespace extension code:
WCHAR szDisplayName[MAX_PATH];
if (shgdnFlags & SHGDN_INFOLDER)
{
// This form of the display name needs to be handled by ParseDisplayName.
hr = _GetName(pidl, szDisplayName, ARRAYSIZE(szDisplayName));
}
else
{
PWSTR pszThisFolder;// = L"Computer\\Jerry";
hr = SHGetNameFromIDList(m_pidl, (shgdnFlags & SHGDN_FORADDRESSBAR) ? SIGDN_DESKTOPABSOLUTEEDITING : SIGDN_DESKTOPABSOLUTEPARSING, &pszThisFolder);
if (SUCCEEDED(hr))
{
StringCchCopy(szDisplayName, ARRAYSIZE(szDisplayName), pszThisFolder);
StringCchCat(szDisplayName, ARRAYSIZE(szDisplayName), L"\\");
WCHAR szName[MAX_PATH];
hr = _GetName(pidl, szName, ARRAYSIZE(szName));
if (SUCCEEDED(hr))
{
StringCchCat(szDisplayName, ARRAYSIZE(szDisplayName), szName);
}
CoTaskMemFree(pszThisFolder);
}
}
if (SUCCEEDED(hr))
{
hr = StringToStrRet(szDisplayName, pName);
}
But the result is:
Update:
hr = pfd->SetOptions(dwFlags | FOS_ALLNONSTORAGEITEMS | FOS_NOVALIDATE);
This works for me!!
With the help of #RemyLebeau, I did some tests in my code. Finally, I found the working solution for me:
I copied the code from MSDN for IFileDialog: https://msdn.microsoft.com/en-us/library/windows/desktop/bb776913.aspx#file_types
and then revise it a little bit:
HRESULT BasicFileOpen()
{
// CoCreate the File Open Dialog object.
IFileDialog *pfd = NULL;
HRESULT hr = CoCreateInstance(CLSID_FileOpenDialog,
NULL,
CLSCTX_INPROC_SERVER,
IID_PPV_ARGS(&pfd));
if (SUCCEEDED(hr))
{
// Create an event handling object, and hook it up to the dialog.
IFileDialogEvents *pfde = NULL;
hr = CDialogEventHandler_CreateInstance(IID_PPV_ARGS(&pfde));
if (SUCCEEDED(hr))
{
// Hook up the event handler.
DWORD dwCookie;
hr = pfd->Advise(pfde, &dwCookie);
if (SUCCEEDED(hr))
{
// Set the options on the dialog.
DWORD dwFlags = 0;
if (SUCCEEDED(hr))
{
// the default flag is FOS_PATHMUSTEXIST and FOS_FILEMUSTEXIST, so I set overwrite it with these two flags.
hr = pfd->SetOptions(dwFlags | FOS_ALLNONSTORAGEITEMS | FOS_NOVALIDATE);
if (SUCCEEDED(hr))
{
// Show the dialog
hr = pfd->Show(NULL);
if (SUCCEEDED(hr))
{
// Obtain the result once the user clicks
// the 'Open' button.
// The result is an IShellItem object.
IShellItem *psiResult;
hr = pfd->GetResult(&psiResult);
if (SUCCEEDED(hr))
{
// We are just going to print out the
// name of the file for sample sake.
PWSTR pszFilePath = NULL;
hr = psiResult->GetDisplayName(SIGDN_FILESYSPATH,
&pszFilePath);
if (SUCCEEDED(hr))
{
TaskDialog(NULL,
NULL,
L"CommonFileDialogApp",
pszFilePath,
NULL,
TDCBF_OK_BUTTON,
TD_INFORMATION_ICON,
NULL);
CoTaskMemFree(pszFilePath);
}
psiResult->Release();
}
}
}
}
// Unhook the event handler.
pfd->Unadvise(dwCookie);
}
pfde->Release();
}
pfd->Release();
}
return hr;
}
The key point is to overwrite the options by SetOptions. Based on the MSDN:https://msdn.microsoft.com/en-us/library/windows/desktop/dn457282(v=vs.85).aspx ,
FOS_PATHMUSTEXIST
The item returned must be in an existing folder. This is a default value.
FOS_FILEMUSTEXIST
The item returned must exist. This is a default value for the Open dialog.
These flags are default values which prevent it returns.
So I set it to :
hr = pfd->SetOptions(dwFlags | FOS_ALLNONSTORAGEITEMS | FOS_NOVALIDATE);
These flags mean:
FOS_NOVALIDATE
Do not check for situations that would prevent an application from opening the selected file, such as sharing violations or access denied errors.
and
FOS_ALLNONSTORAGEITEMS
Enables the user to choose any item in the Shell namespace, not just those with SFGAO_STREAM or SFAGO_FILESYSTEM attributes. This flag cannot be combined with FOS_FORCEFILESYSTEM.
Then it finally works!
The platform I am using is windows 7. I need to create shortcut for the virtual folder on windows 7.
I use windows 7 SDK sample to create a virtual folder under Computer:
The sample project name is called ExplorerDataProvider, it defines the CLSID for the IShellFolder class:
// add classes supported by this module here
const CLASS_OBJECT_INIT c_rgClassObjectInit[] =
{
{ &CLSID_FolderViewImpl, CFolderViewImplFolder_CreateInstance },
{ &CLSID_FolderViewImplContextMenu,CFolderViewImplContextMenu_CreateInstance },
};
The definition for CFolderViewImplFolder_CreateInstance is:
HRESULT CFolderViewImplFolder_CreateInstance(REFIID riid, void **ppv)
{
*ppv = NULL;
CFolderViewImplFolder* pFolderViewImplShellFolder = new (std::nothrow) CFolderViewImplFolder(0);
HRESULT hr = pFolderViewImplShellFolder ? S_OK : E_OUTOFMEMORY;
if (SUCCEEDED(hr))
{
hr = pFolderViewImplShellFolder->QueryInterface(riid, ppv);
pFolderViewImplShellFolder->Release();
}
return hr;
}
And the CFolderViewImplFolder implement IShellFolder2 amd IPersistFolder2.
I found a similar code which is used to create shortcut for printer here:
https://www.codeproject.com/Articles/596642/Creating-a-shortcut-programmatically-in-Cplusplus
and in
https://msdn.microsoft.com/en-us/library/aa969393.aspx#Shellink_Item_Identifiers
Once you have the class identifier for IShellFolder, you can call the CoCreateInstance function to retrieve the address of the interface. Then you can call the interface to enumerate the objects in the folder and retrieve the address of the item identifier for the object that you are searching for. Finally, you can use the address in a call to the IShellLink::SetIDList member function to create a shortcut to the object.
I revised
hr = SHGetMalloc(&pMalloc);
hr = SHGetDesktopFolder( &pDesktopFolder );
hr = SHGetSpecialFolderLocation( NULL, CSIDL_PRINTERS, &netItemIdLst );
hr = pDesktopFolder->BindToObject( netItemIdLst, NULL, IID_IShellFolder, (void **)&pPrinterFolder );
to
// testFolder is the CLSID for the virtual folder implementation
hr = CoCreateInstance(testFolder, NULL, CLSCTX_INPROC_SERVER, IID_IShellFolder, (LPVOID*)&pVirtualFolder);
or
hr = CoCreateInstance(testFolder, NULL, CLSCTX_INPROC_SERVER, IID_IShellFolder2, (LPVOID*)&pVirtualFolder);
But the pVirtualFolder is still NULL, and it prints that "cannot find the corresponding interface".
Is there anything wrong with CoCreateInstance when I use it ? Or I shouldn't use this solution ? Any sample code for it ?
To create a shortcut, you can use the official documentation. Here is a sample code that creates a shortcut for a children of "This PC" (aka: ComputerFolder)
int main()
{
CoInitialize(NULL);
// I've used my Apple's iCloud as an example (name is in french)
// it's a virtual folder, a shell namespace extension
HRESULT hr = CreateComputerChildShortCut(L"Photos iCloud", L"c:\\temp\\my icloud");
printf("hr:0x%08X\n", hr);
CoUninitialize();
return 0;
}
HRESULT CreateComputerChildShortCut(LPWSTR childDisplayName, LPWSTR path)
{
// get My Computer folder's ShellItem (there are other ways for this...)
CComPtr<IShellItem> folder;
HRESULT hr = SHCreateItemInKnownFolder(FOLDERID_ComputerFolder, 0, NULL, IID_PPV_ARGS(&folder));
if (FAILED(hr)) return hr;
// enumerate children
CComPtr<IEnumShellItems> items;
hr = folder->BindToHandler(NULL, BHID_EnumItems, IID_PPV_ARGS(&items));
if (FAILED(hr)) return hr;
for (CComPtr<IShellItem> item; items->Next(1, &item, NULL) == S_OK; item.Release())
{
// get parsing path (if's often useful)
CComHeapPtr<wchar_t> parsingPath;
item->GetDisplayName(SIGDN_DESKTOPABSOLUTEPARSING, &parsingPath);
wprintf(L"Path: %s\n", parsingPath);
// get display name
CComHeapPtr<wchar_t> displayName;
item->GetDisplayName(SIGDN_NORMALDISPLAY, &displayName);
wprintf(L" Name: %s\n", displayName);
if (!lstrcmpi(childDisplayName, displayName))
{
// get pidl
// it's the unambiguous way of referencing a shell thing
CComHeapPtr<ITEMIDLIST> pidl;
hr = SHGetIDListFromObject(item, &pidl);
if (FAILED(hr)) return hr;
// create an instance of the standard Shell's folder shortcut creator
CComPtr<IShellLink> link;
hr = link.CoCreateInstance(CLSID_FolderShortcut);
if (FAILED(hr)) return hr;
// just use the pidl
hr = link->SetIDList(pidl);
if (FAILED(hr)) return hr;
CComPtr<IPersistFile> file;
hr = link->QueryInterface(&file);
if (FAILED(hr)) return hr;
// save the shortcut (we could also change other IShellLink parameters)
hr = file->Save(path, FALSE);
if (FAILED(hr)) return hr;
break;
}
}
return S_OK;
}
Of course, if you know an absolute parsing path or an absolute pidl, you don't have to enumerate anything, this was just for demonstration purposes.
I use filter DS LAME for compressing audio. I loaded it from file "lame.ax" as follows:
// pPath - path to LAME "lame.ax"
HRESULT CMyFilter::CreateObjectFromPath(wchar_t *pPath, REFCLSID clsid, IUnknown **ppUnk)
{
// load the target DLL directly
if (!m_hLibFilter) m_hLibFilter = LoadLibrary(pPath);
if (!m_hLibFilter)
{
return HRESULT_FROM_WIN32(GetLastError());
}
// the entry point is an exported function
FN_DLLGETCLASSOBJECT fn = (FN_DLLGETCLASSOBJECT)GetProcAddress(m_hLibFilter, "DllGetClassObject");
if (fn == NULL)
{
return HRESULT_FROM_WIN32(GetLastError());
}
// create a class factory
IUnknownPtr pUnk;
HRESULT hr = fn(clsid, IID_IUnknown, (void**)(IUnknown**)&pUnk);
if (SUCCEEDED(hr))
{
IClassFactoryPtr pCF = pUnk;
if (pCF == NULL)
{
hr = E_NOINTERFACE;
}
else
{
// ask the class factory to create the object
hr = pCF->CreateInstance(NULL, IID_IUnknown, (void**)ppUnk);
}
}
return hr;
}
further
HRESULT hr = 0;
IUnknown *ppUnk = 0;
ULONG lRef = 0;
hr = CreateObjectFromPath(L"lame.ax", CLSID_LAMEDShowFilter, (IUnknown **)&ppUnk);
hr = ppUnk->QueryInterface(&m_pFilter);
lRef = ppUnk->Release();
It works perfectly. LAME encoding audio.
I want to show the filter settings - property page, but this code failed
bool ShowConfigWindow(HWND hParent)
{
ISpecifyPropertyPages *pProp;
HRESULT hr = m_pFilter->QueryInterface(IID_ISpecifyPropertyPages, (void **)&pProp);
if (SUCCEEDED(hr))
{
// Get the filter's name and IUnknown pointer.
FILTER_INFO FilterInfo;
hr = m_pFilter->QueryFilterInfo(&FilterInfo);
IUnknown *pFilterUnk;
m_pFilter->QueryInterface(IID_IUnknown, (void **)&pFilterUnk);
// Show the page.
CAUUID caGUID;
pProp->GetPages(&caGUID);
pProp->Release();
HRESULT hr = OleCreatePropertyFrame(
hParent, // Parent window
0, 0, // Reserved
FilterInfo.achName, // Caption for the dialog box
1, // Number of objects (just the filter)
&pFilterUnk, // Array of object pointers.
caGUID.cElems, // Number of property pages
caGUID.pElems, // Array of property page CLSIDs
0, // Locale identifier
0, NULL // Reserved
);
// Clean up.
pFilterUnk->Release();
FilterInfo.pGraph->Release();
CoTaskMemFree(caGUID.pElems);
}
return true;
}
I find https://groups.google.com/forum/#!topic/microsoft.public.win32.programmer.directx.video/jknSbMenWeM
I should call CoRegisterClassObject for each property page, but how to do it?
Or what the right way?
OleCreatePropertyFrame takes property page class identifiers (CLSIDs) so you need to find a way to make them "visible" for the API.
Use of CoRegisterClassObject is one of the ways to achieve the mentioned task (perhaps the easiest, another method would be reg-free COM). You need to retrieve IClassFactory pointers for property page CLSIDs the same way as you do it in the first snippet. Then instead of calling IClassFactory::CreateInstance you use the interface pointers as arguments for CoRegisterClassObject API. Make sure you do it on the same thread as the following OleCreatePropertyFrame call. CoRevokeClassObject will clean things up afterwards.