stringstream problem

deVas · 02-14-2007, 04:26 AM

Hi,
I think I have not really understood how stringstreams work in c++. I have this code:

Code:

const char* CAPFILEPREFIX = "cap";
const char* CAPFILESUFFIX = "lst";

int main(int argc,char** argv)
{
[definitions skipped]
	stringstream name(stringstream::in|stringstream::out);			// formatter

	// determine number of cams to capture
	if(argc < 2)
		cout << "Usage: calibRecord <numberOfCams>" << endl;
	else
		name << argv[1];
	name >> camcount;

[code skipped]	

		name.str(string(""));
//		name.sync();
		name << string(CAPFILEPREFIX) << i; 
	
		name << "." << string(CAPFILESUFFIX);
		cout << name.str().c_str() << endl; [debug]
		outs.push_back(new ofstream(name.str().c_str(),ios::trunc));

[code skipped]	
}

Unfortunately the debug output is just an emtpy line. It seems name is initialised with the emtpy string, but filling with '<<' operator again does not work.
What is wrong?
bye,
devas

xhi · 02-14-2007, 09:05 PM

i dont see anything that stands out in that code, so it may be a problem somewhere else.

it could be that an error flag is getting set on the stringstream somewhere causing it to fail on future operations. without all the code its hard to say.