Problems calling dll written by vc ++

tassdar34

The problem is found
Dll problem
The type definition when accepting parameters in dll is cString
Should actually be defined as lptSTR

In addition, my statement ended up like this
declare string method in ***.dll String arg
No problem after running

kriesscoen

No problem is no problem, but it is impossible to return a string to VFP in Dll.
It can only be processed by parameter passing. I have written many DLLs. If you follow your definition above

declare string method in ***.dll String arg

Then, the content contained in your arg cannot be written by Dll, it can only be read.
And what comes back depends on how you wrote it in Dll. If it is an integer, it returns normally.
If it is a string, an error will occur.

Hope you understand.