>Hi,
>
>I need to check return values of many API function calls within class. In order to simplify this task I have the following idea: assign a return value to a property of a class and test a value in Assign method for that property.
>

>Define Class test as Custom
>	Protected RetVal
>	Protected Procedure RetVal_Assign(tnRetVal)
>		If tnRetVal != 0
>			Error "Error #" + Trans(tnRetVal)
>		EndIf
>	EndProc
>	Procedure SomeMethod()
>		This.RetVal = SomeAPIFunction()
>	EndProc
>EndDefine
>

>However this code will generate an error within line with Error statement, but I want to generate an error within line where API function is called. Any ideas?
>
>TIA,
>Alexander

>Or approached from the other side
>

>&This.RetVal = SomeAPIFunction()
>

Well, that sure won't work;

&SomeApiFunction()

will be better.
>the return value or filled with "" (hence no command to perform) or the Error command.

Now the return value could be "ReturnValue = SomeValue" which will be performed by the calling function. So, or this assignment is in it, or the Error command is in it. Either way &SomeAPIFunction should give you the result you want (I think). The only thing left is how to pass the SomeValue "back" to the calling function (a second parameter ?).