>I have two problems in LOCFILE() function, they are :
>- I have specified the cDialogCaption, but it doesn't work the Caption does not exist.
>- If I exit the Open dialog box by choosing Cancel, pressing ESC, or choosing Close from the Control menu, VFP generates an error message and LOCFILE( ) doesn’t return a value. I do not want the program show the error message how to solve this problem ( I don't want to use ON ERROR function )

It sounds like you're trying to use LOCFILE() the same way that the way that the FPW/FPD GENSCRN program did, namely:

USE LOCFILE(filename, 'DBF', 'Where is ' + filename + '?') IN 0

IMHO, you shouldn't because if LOCFILE() can't find the file and the user cancels, there's no way to prevent an error from occurring.

Much better is to use the FILE() function to determine the whether or not the file exists. If it doesn't you can use the GETFILE() function to prompt the user for the location. If the user doesn't locate the file, you can then exit the routine gracefully.

Regarding the caption, this is the prompt that will appear to the left of the file name region in the dialog. There's not much room there, so your prompt is probably being truncated.

hth,