These threads do NOT answer me:
How do you clear a stringstream variable?
std::ifstream file( szFIleName_p );
if( !file ) return false;
// create a string stream for parsing
std::stringstream szBuffer;
std::string szLine; // current line
std::string szKeyWord; // first word on the line identifying what data it contains
while( !file.eof()){
// read line by line
std::getline(file, szLine);
// ignore empty lines
if(szLine == "") continue;
szBuffer.str("");
szBuffer.str(szLine);
szBuffer>>szKeyWord;
szKeyword
will always contain the first word, szBuffer
is not being reset. I can't find a clear example anywhere on how to use stringstream.
New code after answer:
...
szBuffer.str(szLine);
szBuffer.clear();
szBuffer>>szKeyWord;
...
Ok, thats my final version:
std::string szLine; // current line
std::string szKeyWord; // first word on the line identifying what data it contains
// read line by line
while( std::getline(file, szLine) ){
// ignore empty lines
if(szLine == "") continue;
// create a string stream for parsing
std::istringstream szBuffer(szLine);
szBuffer>>szKeyWord;
You didn't clear()
the stream after calling str("")
. Take another look at this answer, it also explains why you should reset using str(std::string())
. And in your case, you could also reset the contents using only str(szLine)
.
If you don't call clear()
, the flags of the stream (like eof
) wont be reset, resulting in surprising behaviour ;)