}; FILETIME DateCreatedFileTime =

Site Navigation.

C++/WinRT version of SetFileTime

Posted on July 16, 2020July 16, 2020 by SetFileTime is simple and does not deserve a blog post: you have a file handle, you have date/time, you set it.
StorageFile File {.
}; FILETIME DateCreatedFileTime =.
; winrt::file_handle File { CreateFile(File.
Path().c_str(), GENERIC_WRITE, FILE_SHARE_READ, nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr) }; winrt::check_bool(SetFileTime(File.get(), &DateCreatedFileTime, &DateCreatedFileTime, .

&DateCreatedFileTime)); C++/WinRT and UWP make the journey much more exciting

There is StorageItemContentProperties Class which provides access to the content-related properties of an item (like a file or folder).
This includes file times which are exposed as named properties, like “System.
DateModified”.
StorageItemContentProperties.
SavePropertiesAsync Method is to save properties associated with the item.
SavePropertiesAsync is asynchronous so you have to deal with this too, but it is not to worry since C++/WinRT does not let you down with this at least.
One another thing is you need a Windows::Foundation::DateTime value for the time which is something you might be not have good understanding for, as opposed to old fashioned FILETIME”s definition of “a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601 (UTC)”.
In C++/WinRT Windows::Foundation::DateTime is directly mapped to std::chrono::time_point and there is also winrt::clock as well, and conversion helpers which are easy to use but you have to be aware of them.
Moving on.
With Windows::Foundation::DateTime value on hands you need to put it into a key-value collection of properties to save.
However, since values, in general, might be of different types you need to convert the time to variant IInspectable.
That is, to “box” it.
Luckily, C++/WinRT has it all for you already: C++/WinRT provides the winrt::box_value function, which takes a scalar value and returns the value boxed into an IInspectable.
For unboxing an IInspectable back into a scalar value, there are the winrt::unbox_value and winrt::unbox_value_or functions.
Now we reached a hard one.
SavePropertiesAsync signature is this:.
SavePropertiesAsync(param::async_iterableWindows::Foundation::IInspectable>> const& propertiesToSave) const {

} So IInspectable there is the boxed value.
This needs to be taken into something convertible to Windows::Foundation::Collections::IKeyValuePair which is already a bit scary.
But the truth is the real bastard is param::async_iterable.

I have to admit MSDN documentation for C++/WinRT is awesome

There are so many things already mentioned there, including, for example, this article: Standard C++ data types and C++/WinRT, which is relevant and helpful.
C++/WinRT is awesome too.
So you might think you could just have a std::map and it will be converted to Windows::Foundation::Collections::IKeyValuePair automagically and then it would be picked up by param::async_iterable as an argument.
No.
[.
] error C2664: ”winrt::Windows::Foundation::IAsyncAction winrt::impl::consume_Windows_Storage_FileProperties_IStorageItemExtraProperties::SavePropertiesAsync(void) const”: cannot convert argument 1 from ”std::map,std::allocator>>” to ”const winrt::param::async_iterable> &” [.
] Reason: cannot convert from ”std::map,std::allocator>>” to ”const winrt::param::async_iterable>” [.
] No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called The thing is, and it’s mentioned here, for example, that async_iterable need to acquire ownership of the collection when it takes it as an argument in a thin and lightweight way.
So you have got to std::move it there before the code starts building.
What do we got.
Thing do build and call UWP API correctly.

Everything is important here: StorageFile File {

}; FILETIME DateCreatedFileTime =.
; std::mapWinrt::Windows::Foundation::IInspectable> PropertyMap; PropertyMap.emplace(L”System

DateModified”, winrt::box_value(winrt::clock::from_file_time(DateCreatedFileTime))); File.
Properties().
SavePropertiesAsync(std::move(PropertyMap)).get(); Now the problem is that runtime behavior is this: E_INVALIDARG 0x80070057 : ‘Cannot write to the specified property (System.
DateModified).
The property is read-only.’.
That is, you don’t change/save this property from UWP.
Categories: Tags: , winapi Discussion: Leave a comment.
Posted on by From the documentation on StorageFolder.
TryGetItemAsync(String) Method: Tries to get the file or folder with the specified name from the current folder.
Returns null instead of raising a FileNotFoundException if the specified file or folder is not found.
using IStorageItem = winrt::Windows::Storage::IStorageItem; IStorageItem EventStorageItem { m_Configuration.m_ApplicationStorageFolder.
TryGetItemAsync(m_FileName).get() }; Exception thrown at 0x00007FFB06BDA799 (KernelBase.dll) in DownloadIssue.exe: WinRT originate error – 0x80070002 : ‘An item cannot be found with the specified name (Issue-1714684927.tsv).’.
It looks like TryGetItemAsync is a wrapper over GetItemAsync to suppress exception if file is not found, and it should be the other way around: if there is no file, there is nullptr result with no exception.
In conjunction with missing mode equivalent to OPEN_ALWAYS it makes it not really convenient to write code free from exceptions.
Exceptionless workaround via file query: #if 1 using namespace winrt::Windows::Storage; StorageFile EventStorageFile(nullptr); Search::StorageFileQueryResult const FileQueryResult { m_Configuration.m_ApplicationStorageFolder.
CreateFileQuery() }; auto const FileVector { FileQueryResult.

GetFilesAsync().get() }; for(auto FileVectorIterator { FileVector

First() }; FileVectorIterator.

HasCurrent(); FileVectorIterator

MoveNext()) { auto const StorageFile { FileVectorIterator

Current() }; if(StorageFile.

IsOfType(StorageItemTypes::File) && _wcsicmp(StorageFile

Name().c_str(), m_FileName.c_str()) == 0) { EventStorageFile = StorageFile; break; } } if(!EventStorageFile) return; #else // TODO: Get rid of exception if file is missing IStorageItem EventStorageItem { m_Configuration.m_ApplicationStorageFolder.
TryGetItemAsync(m_FileName).get() }; if(!EventStorageItem) return; StorageFile EventStorageFile { EventStorageItem.as() }; #endif Categories: Tags: , Discussion: Leave a comment.
Posted on by One more system check tool to quickly enumerate available monitors (using DXGI), take snapshots and was them in PNG files (using WIC).
Apart from straightforward desktop snapshot taking, the tool offers a few more functions: Goes through the entire list of available video adapters and connected monitors.
Uses three slightly different methods to do the same thing: “pass A” and files starting with “A” – using Direct3D 11; “pass B” – basically the same but with a Direct3D 11 device created without specifying adapter; “pass C” – same as pass A but using Direct3D 10.1 API.
Displayed (printed out) are the monitor connected to video adapter outputs, including the case of sharing/mirroring displays; when two displays are showing the same signal via mirroring the output will list them along with connector type, e.g.
same picture is displayed on two physical displays connected with DisplayPort and HDMI cables respectively:.
Output: \.\DISPLAY5 LG Ultra HD, DISPLAYCONFIG_OUTPUT_TECHNOLOGY_DISPLAYPORT_EXTERNAL, \?\DISPLAY#GSM5B09#5&7f9757e&0&UID260#{e6f07b5f-ee97-4a90-b076-33f57bf4eaa7} LG Ultra HD, DISPLAYCONFIG_OUTPUT_TECHNOLOGY_HDMI, \?\DISPLAY#GSM5B08#4&1540260c&0&UID206371#{e6f07b5f-ee97-4a90-b076-33f57bf4eaa7}D3D_FEATURE_LEVEL_12_0✔️ Detects multi-GPU systems and automatically repeats attempt to take snapshots applying different GPU preferences (“Power Saving” preference vs.
“High Performance”); the reason for this is that use of wrong GPU preference is a notorious reason for DXGI Desktop Duplication API to not provide duplication service.
Files named A1, A2 (as opposed to A0) correspond to use of power saving (1) or high performance (2) adapter:.
Last but not least, command line option “-DebugLayers” enables the tool to include DirectX Debug Layer messages in the option (such as, to troubleshoot errors in greater detail); the layer should be installed, of course.
Download links.
Binaries: 64-bit: DxgiTakeSnapshot.exe (in.
ZIP archive).
License: This software is free to use.
Categories: Tags: Direct3D 11, DXGI Discussion: Leave a comment GetFileVersionInfoSize and API sets.
Posted on June 21, 2020June 21, 2020 by GetFileVersionInfoSizeW function in Requirements section lists: Minimum supported clientWindows Vista [desktop apps only]Minimum supported serverWindows Server 2008 [desktop apps only]Target PlatformWindowsHeaderwinver.h (include Windows.h)LibraryVersion.libDLLApi-ms-win-core-version-l1-1-0.dll and this is inaccurate.
The actual requirement DLL is api-ms-win-core-version-l1-1-1.dll instead.
However, what does it mean exactly.
Windows API sets: API Sets rely on operating system support in the library loader to effectively introduce a namespace redirection component into the library binding process.
Subject to various inputs, including the API Set name and the binding (import) context, the library loader performs a runtime redirection of the reference to a target host binary that houses the appropriate implementation of the API Set.
The decoupling between implementation and interface contracts provided by API Sets offers many engineering advantages, but can also potentially reduce the number of DLLs loaded in a process.
The “hyphen one” DLL (api-ms-win-core-version-l1-1-1.dll) is missing in Windows Server 2012 R2 and so the documented promise to offer support starting Windows Server 2008 is incorrect.

Windows Server 2012 R2 has only “hyphen zero” DLL

The hyphen zero DLL exposes, however, GetFileVersionInfoSizeExW entry point so the application developers addressing backward compatibility should switch from use of GetFileVersionInfoSize to GetFileVersionInfoSizeEx even though the former is not documented as deprecated explicitly (probably another out of date aspect of the documentation).
The same applies to GetFileVersionInfo functions.
Also related, this part of MSDN documentation API Sets available in Windows 8.1 and Windows Server 2012 R2 looks good and has no mention of GetFileVersionInfoSize and GetFileVersionInfo.

Categories: Tags: winapi Discussion: Leave a comment

Posted on by Yesterday’s bug is not the only “news”.
Some time ago I already saw weird broken behavior of rebuild of DirectShowSpy.dll with current version of Visual Studio and MSVC.
Now the problem is getting more clear.
Here is some interface: [ object, uuid(6CE45967-F228-4F7B-8B93-83DC599618CA), //dual, //oleautomation, nonextensible, pointer_default(unique) ] interface IMuxFilter : IUnknown { HRESULT IsTemporaryIndexFileEnabled(); HRESULT SetTemporaryIndexFileEnabled([in] BOOL bTemporaryIndexFileEnabled); HRESULT GetAlignTrackStartTimeDisabled(); HRESULT SetAlignTrackStartTimeDisabled([in] BOOL bAlignTrackStartTimeDisabled); HRESULT GetMinimalMovieDuration([out] LONGLONG* pnMinimalMovieDuration); HRESULT SetMinimalMovieDuration([in] LONGLONG nMinimalMovieDuration); }; Compiled into type library it looks okay.
Windows SDK 10.0.18362 COM/OLE Object Viewer shows the correct definition obtained from the type library: [ odl, uuid(6CE45967-F228-4F7B-8B93-83DC599618CA), nonextensible ] interface IMuxFilter : IUnknown { HRESULT _stdcall IsTemporaryIndexFileEnabled(); HRESULT _stdcall SetTemporaryIndexFileEnabled([in] long bTemporaryIndexFileEnabled); HRESULT _stdcall GetAlignTrackStartTimeDisabled(); HRESULT _stdcall SetAlignTrackStartTimeDisabled([in] long bAlignTrackStartTimeDisabled); HRESULT _stdcall GetMinimalMovieDuration([out] int64* pnMinimalMovieDuration); HRESULT _stdcall SetMinimalMovieDuration([in] int64 nMinimalMovieDuration); }; Now what happens when MSVC #import takes it into Win32 32-bit code: struct __declspec(uuid(“6ce45967-f228-4f7b-8b93-83dc599618ca”)) IMuxFilter : IUnknown { // // Raw methods provided by interface // virtual HRESULT __stdcall IsTemporaryIndexFileEnabled ( ) = 0; virtual HRESULT _VtblGapPlaceholder1( ) { return E_NOTIMPL; } virtual HRESULT __stdcall SetTemporaryIndexFileEnabled ( /*[in]*/ long bTemporaryIndexFileEnabled ) = 0; virtual HRESULT _VtblGapPlaceholder2( ) { return E_NOTIMPL; } virtual HRESULT __stdcall GetAlignTrackStartTimeDisabled ( ) = 0; virtual HRESULT _VtblGapPlaceholder3( ) { return E_NOTIMPL; } virtual HRESULT __stdcall SetAlignTrackStartTimeDisabled ( /*[in]*/ long bAlignTrackStartTimeDisabled ) = 0; virtual HRESULT _VtblGapPlaceholder4( ) { return E_NOTIMPL; } virtual HRESULT __stdcall GetMinimalMovieDuration ( /*[out]*/ __int64 * pnMinimalMovieDuration ) = 0; virtual HRESULT _VtblGapPlaceholder5( ) { return E_NOTIMPL; } virtual HRESULT __stdcall SetMinimalMovieDuration ( /*[in]*/ __int64 nMinimalMovieDuration ) = 0; virtual HRESULT _VtblGapPlaceholder6( ) { return E_NOTIMPL; } }; WTF _VtblGapPlaceholder1??.
That was uncalled for.
It looks like some 32/64 bullshit added by MSVC from some point (cross-compilation issue?) for no good reason reason.
A sort of gentle reminder that one should get rid of #import in C++ code.
Please have it fixed, 32-bit code is something still being used.
#import of Microsoft’s own quartz.dll, for example, has the same invalid gap insertion: struct __declspec(uuid(“56a868bc-0ad4-11ce-b03a-0020af0ba770”)) IMediaTypeInfo : IDispatch { // // Raw methods provided by interface // virtual HRESULT __stdcall get_Type ( /*[out,retval]*/ BSTR * strType ) = 0; virtual HRESULT _VtblGapPlaceholder1( ) { return E_NOTIMPL; } virtual HRESULT __stdcall get_Subtype ( /*[out,retval]*/ BSTR * strType ) = 0; virtual HRESULT _VtblGapPlaceholder2( ) { return E_NOTIMPL; } }; Categories: Tags: , , microsoft Discussion: Leave a comment.
Posted on by Ancient piece of code started giving troubles: template class ATL_NO_VTABLE CMediaControlT :.
{.
STDMETHOD(Run)() {.
T* MSVC_FIX_VOLATILE pT = static_cast(this); // <<-------------------------------- CRoCriticalSectionLock GraphLock(pT->m_GraphCriticalSection); pT->FilterGraphNeeded(); __D(pT->GetMediaControl(), E_NOINTERFACE); pT->PrepareCue(); pT->DoRun(); __if_exists(T::Fire_Running) { pT->Fire_Running(); }.
} When MSVC_FIX_VOLATILE is nothing, it appears that optimizing compiler forgets pT and uses just some variation of adjusted this, which makes sense overall because static cast between the two can be resolved at compile time.
However, the problem is that the value of this is wrong and there is undefined behavior scenario.
If I make MSVC_FIX_VOLATILE to be volatile and have the variable pT somewhat “heavier”, optimizing compiler would forget this and uses pT directly with everything working as expected.
The problem still exists in current 16.6.2.
Categories: Tags: , visual studio Discussion: Leave a comment.
Posted on by I might have mentioned that Intel Media SDK has a ridiculously eclectic design and is a software package for the brave.
Something to stay well clear of for as long as you possibly can.
To be on par on the customer support side Intel did something that caused blocking of Intel Developer Zone account.
Over time I did a few attempts to restore the account and only once out of the blue someone followed up from there with a surprising response: “You do not have the enterprise login account”.
That’s unbelievable, I could register account, I could post like this, I can still request password reset links and receive them, but the problem is I don’t have “enterprise account”.
Back to Intel Media SDK where things are designed to work about the same obvious and reliable as their forums.
A bit of code from very basic tutorial: //5.
Initialize the Media SDK encoder sts = mfxENC.
Init(&mfxEncParams); MSDK_IGNORE_MFX_STS(sts, MFX_WRN_PARTIAL_ACCELERATION); MSDK_CHECK_RESULT(sts, MFX_ERR_NONE, sts); // Retrieve video parameters selected by encoder.
// – BufferSizeInKB parameter is required to set bit stream buffer size mfxVideoParam par; memset(&par, 0, sizeof(par)); sts = mfxENC.
GetVideoParam(&par); MSDK_CHECK_RESULT(sts, MFX_ERR_NONE, sts); //6.
Prepare Media SDK bit stream buffer mfxBitstream mfxBS; memset(&mfxBS, 0, sizeof(mfxBS)); mfxBS.
MaxLength = par.mfx.
BufferSizeInKB * 1000; mfxBS.
Data = new mfxU8[mfxBS.
MaxLength]; MSDK_CHECK_POINTER(mfxBS.
Data, MFX_ERR_MEMORY_ALLOC); Even though who was that genius who designed it to measure buffers in kilobytes, the snippet makes great sense.
You ask SDK for required buffer size and then you provide the space.
I myself am even more generous than that: I grant 1024 bytes for every kilobyte in question.
The thing is that hardware encoder is still hitting scenarios where it is unable to fit the data into the space sized the mentioned way.
What happens if encoder has more data on hands, maybe it emits a warning.
“Well I just screwed things up, be aware”.
Buffer overflow error.
Buffer reallocation request.
Oh no, the SDK makes it smarter: it fills the buffer completely trimming the excess making the bitstream incompliant and triggering frame corruption later on decoder end.
Then encoder continues as if nothing important has happened.
There is an absolute rule in the software technology that if the thing is designed to be able to get broken in certain aspect, once in a while there will be a consumer hit by this flaw.
Maybe just this once Intel guys thought it would not be the case.
Categories: Tags: , , intel, Discussion: Leave a comment ← Older Posts Newer Posts → Theme: by Danny Cooper.

Your email address will not be published.

Tham gia Nhà cái slot 9club