Question

With an exception that there is no solution or alternative to, for example failing to open an image, I usually do something like:

try
{
    img.load_from_file("my_image.png");
}
catch( const image_loading_exception& e )
{
    /* Could Not Load Image: 'my_image.png' ! */
    string err = "Could Not Load Image: " + e.what() + " !"; // 
    pro::message_box::show( err );
}

Now, is this really good error handling? Should I do something more descriptive, or try to resolve the issue. Displaying a error message box is the only thing that I can think of when handling image or file loading failure. What do you guys do?

Answer 1

It depends what are requirements :

• if the program can not continue because a critical image is missing, then it should stop the execution and inform the user what happened
• if the user entered wrong parameter (for example, wrong file name), they should be informed and asked to enter it again
• if it is something that is not important at all, then just log a message without informing the user