CompareDirectory Callback

The CompareDirectory method of the App object calls this Callback function:

• On entering a directory;
• On leaving a directory;
• When a file is found.

Callback Function Protype

function CompareCallback(directory_Flag, file1_Object, file2_Object)
{

}

directory_Flag

• 2: Entering the main directory. The main directory is the argument passed to ScanDirectory
• -2: Leaving the main directory.
• 1: Entering a sub-directory.
• -1: Leaving a sub-directory.
• 0: A file is found.

Return value

• 1 (or no return value): Continue the scanning;
• 0: Skip this sub-directory;
• -1: Abort the scanning;

Sample Callback Function

function CompareCallback(dirFlag, fo1, fo2)
{
    switch(dirFlag)
    {
    case 2:
        app.Print("\nStart comparing " + fo1.FullPath + " with " + fo2.FullPath + "\n");
    case -2:
       app.Print("\nFinish comparing " + fo1.FullPath + " with " + fo2.FullPath + "\n");
        break;
    case 0:
        if(fo2.Valid)
        {
            var r=fo1.LastWriteTime.Compare(fo2.LastWriteTime);
            if(r>0)
            {
                app.Print(fo1.FullPath + " is newer than " + fo2.FullPath+"\n");
            }
            else if(r<0)
            {
                app.Print(fo1.FullPath + " is older than " + fo2.FullPath+"\n");
            }
            else
            {
                //....
            }
        break;
    case 1:
        app.Print("Begin comparing sub-directory " + fo1.FullPath + " with " + fo2.FullPath + "\n");
        break;
    case -1:
        app.Print("End of comparing sub-directory " + fo1.FullPath + " with " + fo2.FullPath + "\n");
        break;
    }

    if(app.kbhit()) //user pressed a key?
    {
        var ch=app.getch(); //Read the key without displaying it
        if(ch==27) //If the key is ESC
        {
            app.Print("*** Abort ***\n");
            return(-1); 
        }
    }
}