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Resolved calling issue with third party (C++) dll as "R021 - Bad runtime function reference"

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  1. mukul pandey
    mukul pandey
  2. PowerBuilder
  3. Friday, 26 June 2020 12:26 PM UTC

Hi Everyone,

 

I am using Powerbuilder classic 2017R2 build 1769(32 bit) and windows 10. I am not able to use c++ dll in my application. I got runtime error as "R021 - Bad runtime function reference".

My C++ dll code is:-

int __declspec(dllexport) __stdcall testMethodCall(char* retVal)
    {
        strcpy_s(retVal, sizeof("Inside Test Library"), "Inside Test Library");
        return 0;
    }
 
Declaration of global external function as:-
 
        Function int testMethodCall(Ref char cretval[100]) library "TestDLLforCSW.dll" alias for "testMethodCall;Ansi"
 
calling:-
 
      char cretval[100]=''
      int li_ret
      li_ret=testMethodCall(REF cretval)
 
Please suggest.
 
Thanks,
Mukul
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Responses (1)
Roland Smith
Roland Smith Accepted Answer Pending Moderation
  1. Friday, 26 June 2020 12:41 PM UTC
  2. PowerBuilder
  3. # 1

A couple issues:

It should be declared as a string on the PB side and allocated like this:

ls_retval = Space(100)

An int in C is a long in PowerBuilder.

 

When I write a C function I always use a .def file to list exported functions. Here is an example of one of mine:

void WINAPI EscapeToAscii(CHAR *lpEscape)

{

}

PowerBuilder declaration:

Subroutine EscapeToAscii ( Ref string lpEscape ) Library "twserver.dll" Alias For "EscapeToAscii;Ansi"

 

The function converts hex escaped strings back to characters so the output string is always shorter than the input.

 

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