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PB 2022 | DLL crashes while running
  1. New
  2. Issue
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  1. himanshi tayal
  2. PowerBuilder
  3. Thursday, 21 August 2025 11:51 AM UTC

Hello ,

We are migrating from Sybase PowerBuilder 12.5 to Appeon PowerBuilder 2022 (64-bit). We have a Tuxedo DLL built using Oracle Tuxedo version 22.1.0.0.0.

Previously, we had the following external function definition:

FUNCTION long Fchgstr32 ( ulong buffer, ulong fldid, long occ, ref string fldval, long fldlen ) Library "pbtux32.dll" alias for "Fchgstr32;Ansi"

We changed ulong to longptr in an attempt to support 64-bit:

FUNCTION long Fchgstr32 ( longptr buffer, ulong fldid, long occ, ref string fldval, ulong fldlen ) Library "pbtux32.dll" alias for "Fchgstr32;ANSI"

The original C definition of Fchgstr32 was:

__declspec(dllexport) long __stdcall Fchgstr32( long buffer, DWORD fldid, long occ, char* fldvar, DWORD fldlen ) { return Fchg32((FBFR32 *)buffer, fldid, occ, fldvar, fldlen); }

We modified it for 64-bit as follows:

__declspec(dllexport) long __stdcall Fchgstr32( LONG_PTR buffer, DWORD fldid, long occ, char* fldvar, DWORD fldlen ) { return Fchg32((FBFR32 *)buffer, fldid, occ, fldvar, fldlen); }

Despite these changes, the application still crashes. In Visual Studio, all required DLLs are correctly linked, and Fchg32 resides in libfml32.dll, which is part of Tuxedo 22.1.0.0.0. All components are 64-bit.

Could you please help us identify where the issue might be occurring?

Datawindow (.srd) changed in repo, but change is not reflect... Cartella .pb\* in Powerbuilder 2025 con Soluzione
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