这些线程不回答我:
重置字符串流
如何清除字符串流变量?
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
将始终包含第一个单词,szBuffer
不会被重置.我在任何地方都找不到关于如何使用 stringstream 的明确示例.
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.
回答后的新代码:
...
szBuffer.str(szLine);
szBuffer.clear();
szBuffer>>szKeyWord;
...
好的,这是我的最终版本:
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;
您在调用 str("")
后没有 clear()
流.再看看这个答案,它还解释了为什么你应该使用 str(std::string())
重置.在您的情况下,您还可以仅使用 str(szLine)
重置内容.
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)
.
如果你不调用clear()
,流的标志(如eof
)不会被重置,导致令人惊讶的行为;)
If you don't call clear()
, the flags of the stream (like eof
) wont be reset, resulting in surprising behaviour ;)
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