本文整理汇总了C++中FileHandle::isValid方法的典型用法代码示例。如果您正苦于以下问题：C++ FileHandle::isValid方法的具体用法？C++ FileHandle::isValid怎么用？C++ FileHandle::isValid使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类FileHandle的用法示例。
在下文中一共展示了FileHandle::isValid方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: _tmain
//void ConsumeData(void*)
//{
// while (!g_ProducerStarted)
// {
// Sleep(10);
// }
//
// FileHandle hConsumer = CreateFile(LN250FileName.c_str(),
// GENERIC_WRITE,
// FILE_SHARE_READ | FILE_SHARE_WRITE,
// NULL,
// OPEN_EXISTING, 0, NULL);
//
// if (!hConsumer.isValid())
// {
// UCSBUtility::LogError(__FUNCTION__, __FILE__, __LINE__, "Failed to open file %ls %d\\n", LN250FileName.c_str(),
// GetLastError());
// return;
// }
//
// char buffer[1024];
// DWORD totalRead = 0;
// while(g_ProducerStarted)
// {
// //DWORD size = GetFileSize(hFile, NULL);
// DWORD numRead = 0;
// ReadFile(hConsumer, &buffer, sizeof(buffer), &numRead, NULL);
// totalRead += numRead;
// Sleep(sleepConsumer);
// }
//
// UCSBUtility::LogError(__FUNCTION__, __FILE__, __LINE__, "Total Bytes Read %d\\n", totalRead);
//};
//
//
int _tmain(int argc, _TCHAR* argv[])
{
HANDLE hFile = CreateFile(LN250FileName.c_str(),
0,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
CREATE_ALWAYS, 0, NULL);
CloseHandle(hFile);
FileHandle hProducer = CreateFile(LN250FileName.c_str(),
GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_ALWAYS, 0, NULL);
if (!hProducer.isValid())
{
UCSBUtility::LogError(__FUNCTION__, __FILE__, __LINE__, "Failed to open file %ls %d\\n", LN250FileName.c_str(),
GetLastError());
return 1;
}
HANDLE hThread0 = (HANDLE) _beginthread(ProduceData, 0, (HANDLE)hProducer);
HANDLE hThread1 = (HANDLE) _beginthread(ProduceData, 0, (HANDLE)hProducer);
HANDLE handles[] = { hThread0, hThread1 };
WaitForMultipleObjects(2, handles, true, INFINITE);
return 0;
}示例2: ReadWebFile
// This is the heart of the download code
// (that's separate from the priority queue, which is the heart of
// the timing mechanism)
// This simply does what it claims
// Reads a file from the web given an existing internet connection and
// source and destination names
int ReadWebFile(HINTERNET iNetConnection,
wstring const& sourceName,
wstring const& destinationName)
{
InternetHandle hURL = HttpOpenRequest(iNetConnection,
L"POST", // GET or POST
sourceName.c_str(), // root "/" by default
NULL, // Use default HTTP/1.1 as the version
NULL, // Do not provide any referrer
NULL, // Do not provide Accept types
0,
NULL);
if (hURL == NULL)
{
//Error = GetLastError();
//LogInetError(Error, L"HttpOpenRequest");
return 1;
}
if (!HttpSendRequest(hURL, NULL, NULL, NULL, 0))
{
UCSBUtility::LogError(__FUNCTION__, __FILE__, __LINE__, "HttpSendRequest %d\n", GetLastError());
return 1;
}
wstring lengthData;
lengthData.resize(256);
DWORD QIRead = lengthData.size();
DWORD index = 0;
if (!HttpQueryInfo(hURL, HTTP_QUERY_CONTENT_LENGTH, &lengthData[0], &QIRead, &index))
{
DWORD lastError = GetLastError ();
UCSBUtility::LogError(__FUNCTION__, __FILE__, __LINE__, "Unable to get the content length (lastError = %d)\n", lastError);
vector<char> temp;
temp.resize(QIRead);
HttpQueryInfo(hURL, HTTP_QUERY_CONTENT_LENGTH, &temp[0], &QIRead, &index);
return 1;
}
DWORD contentLength = _wtoi(lengthData.c_str());
UCSBUtility::LogError(__FUNCTION__, __FILE__, __LINE__, "Opening file: %ls\nLength: %d bytes\n", sourceName.c_str(), contentLength);
//printf("Opening file: %ls\nLength: %d bytes\n", sourceName.c_str(), contentLength);
vector<char> buffer;
buffer.resize(contentLength + 1);
DWORD bytesRead = 0;
BOOL bRead = InternetReadFile(hURL, &buffer[0], buffer.size() - 1, &bytesRead);
if (!bRead || bytesRead == 0)
{
UCSBUtility::LogError(__FUNCTION__, __FILE__, __LINE__, "Failed to get the data\n");
return 1;
}
//printf ("%d bytes\n", bytesRead);
FileHandle hFile (CreateFile(destinationName.c_str(), GENERIC_WRITE, 0,
NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL));
if (!hFile.isValid())
{
UCSBUtility::LogError(__FUNCTION__, __FILE__, __LINE__, "Unable to open output file\n");
return 1;
}
DWORD bytesWritten = 0;
if (!WriteFile(hFile, &buffer[0], bytesRead, &bytesWritten, NULL))
{
UCSBUtility::LogError(__FUNCTION__, __FILE__, __LINE__, "Failed to write the file\n");
return 1;
}
return 0;
}