This example uses WinGetErrorInfo to obtain detailed error information, assigns the error code, and frees the error block with WinFreeErrorInfo.

#define INCL_WINERRORS          /* Window Error Functions       */
#include <os2.h>

BOOL  fSuccess;         /* success indicator                    */
ERRORID  erridErrorCode;/* last error id code                   */
PERRINFO  perriErrorInfo;/* error info structure                */
HAB   hab;              /* anchor-block handle                  */

/* obtain error block */
perriErrorInfo = WinGetErrorInfo(hab);
erridErrorCode = perriErrorInfo->idError;

/* free error block */
fSuccess = WinFreeErrorInfo(perriErrorInfo);