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Resolved Error calling external dll function
  1. Issue
  2.  DLL
  3.  External Functions
0 Votes
  1. ts maniam
  2. PowerBuilder
  3. Tuesday, 21 April 2020 04:04 AM UTC

1. We have a c++ dll compiled in CodeBlocks which has a function declared as below

__declspec(dllexport) char * __cdecl vc_encrypt(char* vol, char* id);

(MingGW compiler suffixes @8 to the function name when __stdcall is used in c++)

2. The function has been called with the code in a user event as below

ls_setcode = vc_encrypt(ls_mvol, ls_code)

The error message we get is 

error calling external function %s

3. The declaration in Global External Function in PB is as below

Function String vc_encrypt(char vol, char id) library "exdll.dll" alias for "vc_encrypt;Ansi" 

(when string is used as datatype in input, the error message "specified argument type differs from required argument type at run time in DLL function vc_encrypt - invalid stack pointer on return from function call at line ....)

 

I do not have experience in c++ and tried different combinations. The C++ code not written by me. Imported from visual studio solution of an earlier version. Searched in google and appeon community - some improvements made but could not find the solution for this specific problem.   We use Appeon PB 2017 R3. Can you please help me out 

TS Maniam, tsmaniamca@gmail.com 

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Migrating PB2017 R2 to PB2019 -> Executable crashes SYSAM Error: A PACKAGE component must be specified.
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