Summary: When you use Microsoft Visual FoxPro, you may make use of the COMRETURNERROR() function in your Visual FoxPro Component Object Model (COM) servers. However, COMRETURNERROR only works from method calls. There is no way that COM can return an error during object creation. As a result, you do not get a detailed error message if a problem occurs in the INIT of your object and you are using COMRETURNERROR only.
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Manual ResolutionsAs a possible workaround for this issue, use an approach similar to the following when you develop your COM server:
MESSAGEBOX("Create Object Failed!")
RETURN .F. ENDIF *!* Text in this property means we had an error (default is logical). IF VARTYPE(goMyServer.xError) = "C"
lcComInitError = goMyServer.xError
lnReleaseCom = MESSAGEBOX("The following error occurred:" + ;
+ CRLF + CRLF + lcComInitError + CRLF + CRLF + ;
"Additional errors may have occurred. Check COMERR.TXT" + CRLF + ;
"in the directory with the object for details. Release the object?", ;
MB_ICONQUESTION + MB_YESNO, ;
"Error Creating Object - Release It?")
IF lnReleaseCom = IDYES
MESSAGEBOX("Object Released",MB_OK,"COM ERROR")
MESSAGEBOX("Object Remains",MB_OK,"COM ERROR")
RETURN .F. ENDIF *!* If goMyServer.xError is still .F., no INIT error occurred, *!* so do whatever... MESSAGEBOX("Object Created Successfully") RELEASE goMyServer ***************** END CODE ******************
The main issue with this approach is that the error message you get from the message box is only the LAST error that occurred in the INIT of the object (error 24). To work around this, the object writes any errors out to a file named COMERR.TXT that resides in the same directory as the server.
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