Using NI control CWgraph encounter problems, he provides the interface function, parameter is mostly tagVARIANT types, each operation feel good trouble, especially for data transformation, turn it into a double, int, and so on, have what good method?

CodePudding user response:

This data type is used to convert,

CodePudding user response:

I also pretty vexed the VARIANT types of, ha ha

CodePudding user response:

Variations in c + + BUILDER (API) has several, is not unified, very disorderly feeling, conversion of trouble,