本文整理汇总了C++中DataFile::addHeader方法的典型用法代码示例。如果您正苦于以下问题：C++ DataFile::addHeader方法的具体用法？C++ DataFile::addHeader怎么用？C++ DataFile::addHeader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DataFile的用法示例。
在下文中一共展示了DataFile::addHeader方法的1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: addNewHeader
// Add a new header because
// - there's none
// - data type or ctrl_info changed
// - the existing data buffer is full.
// Might switch to new DataFile.
// Will write ctrl_info out if new_ctrl_info is set,
// otherwise the new header tries to point to the existing ctrl_info.
void DataWriter::addNewHeader(bool new_ctrl_info)
{
FileOffset ctrl_info_offset;
AutoPtr<DataHeader> new_header;
{
bool new_datafile = false; // Need to use new DataFile?
DataFile *datafile = 0;
size_t headroom = 0;
try
{
if (!header)
new_datafile = true; // Yes, because there's none.
else
{ // Check how big the current data file would get
FileOffset file_size = header->datafile->getSize();
headroom = header->datafile->getHeaderSize(channel_name,
dbr_type, dbr_count,
next_buffer_size);
if (new_ctrl_info)
headroom += ctrl_info.getSize();
if (file_size+headroom > file_size_limit) // Yes: reached max. size.
new_datafile = true;
}
if (new_datafile)
{
# ifdef DEBUG_DATA_WRITER
LOG_MSG("DataWriter::addNewHeader: New Datafile\n");
# endif
datafile = createNewDataFile(headroom);
new_ctrl_info = true;
}
else
{
# ifdef DEBUG_DATA_WRITER
LOG_MSG("DataWriter::addNewHeader: adding to '%s'\n",
header->datafile->getFilename().c_str());
# endif
datafile = header->datafile->reference();
}
if (new_ctrl_info)
datafile->addCtrlInfo(ctrl_info, ctrl_info_offset);
else // use existing one
ctrl_info_offset = header->data.ctrl_info_offset;
new_header = datafile->addHeader(channel_name, dbr_type, dbr_count,
period, next_buffer_size);
datafile->release(); // now ref'ed by new_header
}
catch (GenericException &e)
{
if (datafile)
{
datafile->release();
datafile = 0;
}
throw GenericException(__FILE__, __LINE__,
"Channel '%s':\n%s",
channel_name.c_str(), e.what());
}
}
LOG_ASSERT(new_header);
new_header->data.ctrl_info_offset = ctrl_info_offset;
if (header)
{ // Link old header to new one.
header->set_next(new_header->datafile->getBasename(),
new_header->offset);
header->write();
// back from new to old.
new_header->set_prev(header->datafile->getBasename(),
header->offset);
// Update index entry for the old header.
if (tree) // Ignore result since block might already be in index
tree->updateLastDatablock(
header->data.begin_time, header->data.end_time,
header->offset, header->datafile->getBasename());
}
// Switch to new_header (AutoPtr, might del. current header).
header = new_header;
// Calc buffer size for the following header (not the current one).
calc_next_buffer_size(next_buffer_size);
// new header will be added to index when it's closed.
}