本文整理汇总了C++中BPositionIO::Position方法的典型用法代码示例。如果您正苦于以下问题：C++ BPositionIO::Position方法的具体用法？C++ BPositionIO::Position怎么用？C++ BPositionIO::Position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BPositionIO的用法示例。
在下文中一共展示了BPositionIO::Position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:
static BPositionIO *
get_seekable(BDataIO * data)
{
// try to cast to BPositionIO then perform a series of
// sanity checks to ensure that seeking is reliable
BPositionIO * seekable = dynamic_cast<BPositionIO *>(data);
if (seekable == 0) {
return 0;
}
// first try to get our current location
off_t current = seekable->Seek(0, SEEK_CUR);
if (current < 0) {
return 0;
}
// check it against position
if (current != seekable->Position()) {
return 0;
}
// next try to seek to our current location (absolutely)
if (seekable->Seek(current, SEEK_SET) < 0) {
return 0;
}
// next try to seek to the start of the stream (absolutely)
if (seekable->Seek(0, SEEK_SET) < 0) {
return 0;
}
// then seek back to where we started
if (seekable->Seek(current, SEEK_SET) < 0) {
// really screwed
return 0;
}
// next try to seek to the end of the stream (absolutely)
if (seekable->Seek(0, SEEK_END) < 0) {
return 0;
}
// then seek back to where we started
if (seekable->Seek(current, SEEK_SET) < 0) {
// really screwed
return 0;
}
return seekable;
}