I'm making a Cloud Sync Engines Supports Placeholder based on CloudMirror. And got problem on CF_CALLBACK_TYPE_FETCH_DATA
When i double click file (placeholder) in window explorer, app trigger FILE_ATTRIBUTE_PINNED and Hydrating file. And then cfapi call FETCH_DATA and read asynchronous file (my app work look same with CloudMirror).
But i got HRESULT return from CfExecute is 0x8007017c the cloud operation is invalid. Debug look all value is true
Then how to resolve it, thank.
#define CHUNKSIZE 4096
#define FIELD_SIZE( type, field ) ( sizeof( ( (type*)0 )->field ) )
#define CF_SIZE_OF_OP_PARAM( field )( FIELD_OFFSET( CF_OPERATION_PARAMETERS, field ) + FIELD_SIZE( CF_OPERATION_PARAMETERS, field ) )
struct READ_COMPLETION_CONTEXT
{
OVERLAPPED Overlapped;
LARGE_INTEGER CallbackInfo_FileSize;
CF_CONNECTION_KEY CallbackInfo_ConnectionKey;
CF_TRANSFER_KEY CallbackInfo_TransferKey;
HANDLE PipeHandle{ 0 };
LARGE_INTEGER StartOffset;
LARGE_INTEGER RemainingLength;
ULONG BufferSize;
WCHAR* FullPath{ nullptr };
BYTE* Buffer{ nullptr };
~READ_COMPLETION_CONTEXT()
{
if (FullPath) delete FullPath;
if (Buffer) delete Buffer;
if (PipeHandle) CloseHandle(PipeHandle);
}
void Cancel()
{
TransferData(
CallbackInfo_ConnectionKey,
CallbackInfo_TransferKey,
NULL,
StartOffset,
RemainingLength,
STATUS_UNSUCCESSFUL);
}
};
void CALLBACK FETCH_DATA(_In_ CONST CF_CALLBACK_INFO* callbackInfo, _In_ CONST CF_CALLBACK_PARAMETERS* callbackParameters)
{
try
{
//...
if (DownloadItem(/*call to c++\cli for stream download and copy async to pipe server*/))
{
std::wstring pipename(L"\\\\.\\pipe\\");
pipename.append(ci->Id);
HANDLE hpipe = CreateFile(pipename.c_str(),
GENERIC_READ,
0, // no sharing
NULL, // default security attributes
OPEN_EXISTING,
FILE_FLAG_OVERLAPPED,
NULL); // no template file
if (hpipe != INVALID_HANDLE_VALUE)
{
if (GetLastError() != ERROR_PIPE_BUSY)
{
READ_COMPLETION_CONTEXT* readContext = new READ_COMPLETION_CONTEXT();
DWORD chunkBufferSize = (ULONG)min(callbackParameters->FetchData.RequiredLength.QuadPart, CHUNKSIZE);
std::wstring fullClientPath(callbackInfo->VolumeDosName);
fullClientPath.append(callbackInfo->NormalizedPath);
readContext->Overlapped.Offset = callbackParameters->FetchData.RequiredFileOffset.LowPart;
readContext->Overlapped.OffsetHigh = callbackParameters->FetchData.RequiredFileOffset.HighPart;
readContext->CallbackInfo_FileSize = callbackInfo->FileSize;
readContext->CallbackInfo_ConnectionKey = callbackInfo->ConnectionKey;
readContext->CallbackInfo_TransferKey = callbackInfo->TransferKey;
readContext->PipeHandle = hpipe;
readContext->StartOffset = callbackParameters->FetchData.RequiredFileOffset;
readContext->RemainingLength = callbackParameters->FetchData.RequiredLength;
readContext->BufferSize = chunkBufferSize;
readContext->FullPath = Utilities::WStringToWCHARP(fullClientPath);
readContext->Buffer = new BYTE[chunkBufferSize];
if (ReadFileEx(hpipe, readContext->Buffer, chunkBufferSize, &readContext->Overlapped, OverlappedCompletionRoutine))
if (GetLastError() == S_OK) return;
delete readContext;
}
else CloseHandle(hpipe);
}
}
}
catch (...)
{
}
TransferData(
callbackInfo->ConnectionKey,
callbackInfo->TransferKey,
NULL,
callbackParameters->FetchData.RequiredFileOffset,
callbackParameters->FetchData.RequiredLength,
STATUS_UNSUCCESSFUL);
}
void CALLBACK CANCEL_FETCH_DATA(_In_ CONST CF_CALLBACK_INFO* callbackInfo,_In_ CONST CF_CALLBACK_PARAMETERS* callbackParameters)
{
}
HRESULT TransferData(
_In_ CF_CONNECTION_KEY connectionKey,
_In_ LARGE_INTEGER transferKey,
_In_reads_bytes_opt_(length.QuadPart) LPCVOID transferData,
_In_ LARGE_INTEGER startingOffset,
_In_ LARGE_INTEGER length,
_In_ NTSTATUS completionStatus)
{
CF_OPERATION_INFO opInfo = { 0 };
CF_OPERATION_PARAMETERS opParams = { 0 };
opInfo.StructSize = sizeof(opInfo);
opInfo.Type = CF_OPERATION_TYPE_TRANSFER_DATA;
opInfo.ConnectionKey = connectionKey;
opInfo.TransferKey = transferKey;
opParams.ParamSize = CF_SIZE_OF_OP_PARAM(TransferData);
opParams.TransferData.CompletionStatus = completionStatus;
opParams.TransferData.Buffer = transferData;
opParams.TransferData.Offset = startingOffset;
opParams.TransferData.Length = length;
HRESULT hresult = CfExecute(&opInfo, &opParams);
return hresult;
}
void WINAPI OverlappedCompletionRoutine(
_In_ DWORD errorCode,
_In_ DWORD numberOfBytesTransfered,
_Inout_ LPOVERLAPPED overlapped)
{
READ_COMPLETION_CONTEXT* readContext = (READ_COMPLETION_CONTEXT*)overlapped;
if (errorCode == 0 && !GetOverlappedResult(readContext->PipeHandle, overlapped, &numberOfBytesTransfered, TRUE)) errorCode = GetLastError();
if (errorCode != 0)
{
readContext->Cancel();
delete readContext;
return;
}
assert(numberOfBytesTransfered != 0);
LONGLONG total = readContext->CallbackInfo_FileSize.QuadPart;
LONGLONG completed = readContext->StartOffset.QuadPart + numberOfBytesTransfered;
Utilities::ApplyTransferStateToFile(readContext->FullPath,
readContext->CallbackInfo_ConnectionKey,
readContext->CallbackInfo_TransferKey,
total,
completed);
HRESULT hresult = TransferData(
readContext->CallbackInfo_ConnectionKey,
readContext->CallbackInfo_TransferKey,
errorCode == 0 ? readContext->Buffer : NULL,
readContext->StartOffset,
Utilities::LongLongToLargeInteger(numberOfBytesTransfered),
errorCode);
if (hresult != S_OK)
{
readContext->Cancel();
delete readContext;
winrt::check_hresult(hresult);
return;
}
readContext->StartOffset.QuadPart += numberOfBytesTransfered;
readContext->RemainingLength.QuadPart -= numberOfBytesTransfered;
if (readContext->RemainingLength.QuadPart > 0)
{
DWORD bytesToRead = (DWORD)(min(readContext->RemainingLength.QuadPart, readContext->BufferSize));
readContext->Overlapped.Offset = readContext->StartOffset.LowPart;
readContext->Overlapped.OffsetHigh = readContext->StartOffset.HighPart;
if (!ReadFileEx(readContext->PipeHandle, readContext->Buffer, bytesToRead, &readContext->Overlapped, OverlappedCompletionRoutine))
{
readContext->Cancel();
delete readContext;
}
}
else delete readContext;//done
}
Edit: After test, fake byteread = 4096 it running successful. Then, how much the min limit of data transfer?