Question

I’ve got a program that deals with both Ascii and binary PGM images. I open the file open mode using:

ifstream istr(argv[i]);

After reading in the header of the PGM file, that determines if I’m dealing with binary data or ASCII. Is there a way then to change the istr to the binary mode?

Answer 1

1> You would have first clear the stream by calling Clear method to reset the mode of the stream(required if your stream has hit an end-of-file or has encountered an error)

2> You would have to close the stream by calling close method

3> Finally you have to call the open method to open the new file with the desired filemode