seekg() Not Working

Hi,

For some reason, the following piece of code won't rewind the cursor position in the file stream:

Code:

// C++ Statements

std::ifstream FileStream;
FileStream.open("MyFile");

char c;

while(!FileStream.eof()) {
FileStream.get(c);
}

FileStream.seekg(0, std::ios::beg);

if(!FileStream.eof()) {
std::cout << "Not EOF" << std::endl;
}
else {
std::cout << "EOF" << std::endl;
}
// More C++ Statements

The output is "EOF," not "Not EOF."

But the following piece of code does rewind the stream:

Code:

// C++ Statements

std::ifstream FileStream;
FileStream.open("MyFile");

char c;

while(!FileStream.eof()) {
FileStream.get(c);
}

FileStream.close();
FileStream.open("MyFile");

if(!FileStream.eof()) {
std::cout << "Not EOF" << std::endl;
}
else {
std::cout << "EOF" << std::endl;
}
// More C++ Statements

In this case, the output is "Not EOF."

Can someone please tell me why the seekg() statement is not rewinding the stream position?

Thanks in advance for your help.

*****

I am using g++ in FC5.

Just curious, but did you actually try to read from the file in the first example? It is possible that a FileStream.clear() before the seekg would be sufficient for your code to work as expected.

Originally Posted by laserlight

Just curious, but did you actually try to read from the file in the first example? It is possible that a FileStream.clear() before the seekg would be sufficient for your code to work as expected.

I'm quite shure you are right.

Code:

while(!FileStream.eof()) {
     FileStream.get(c);
}

reads the file until eof. now the file is in error state ( eof ) and seekg is ignored.
clear() should help.
Kurt

FileStream.clear() worked like magiC++!

Thanks a lot, folks.