Question

std::string systemStr = "C:\\gcc1\\gccxml.exe ";
    systemStr += "\"" ;
    systemStr += argv[1] ;
    std::cout<<"Header File is:"<<argv[1]<<endl;

In the above code snippet, argv[1] represents the name of the header file. I want to open this header file and search for #ifdefs that may be present. How do I go about doing this? The problem is that argv[1] is a string. I’m sorry if I’m unclear.

Answer 1

How about something like this…

std::cout<<"Header File is:"<<argv[1]<<endl;

std::ifstream file(argv[1]);
int lineNum = 0;
bool hasIfdef = false;

while( file.good() )
{
    std::string line;
    std::getline( file, line );
    lineNum++;

    if( line.find("#ifdef") != std::string::npos ||
        line.find("#ifndef") != std::string::npos )
    {
        std::cout << "Line " << lineNum << ": " << line << std::endl;
        hasIfdef = true;
    }
}