Table of Contents
This is part of Family API which allow to create dual-os version of program runs under OS/2 and DOS
Note: This is legacy API call. It is recommended to use 32-bit equivalent
DosGetProcAddr
This call returns a far address to a desired procedure within a dynamic link module.
Syntax
DosGetProcAddr (ModuleHandle, ProcName, ProcAddress)
Parameters
- ModuleHandle (HMODULE) - input: Handle of the dynamic link module.
- ProcName (PSZ) - input: Address of a name string that contains the referenced procedure name.
Alternatively, if the selector portion of the pointer is null, the offset portion of the pointer is an explicit entry number (ordinal) within the dynamic link module.
DosGetProcAddr for entries within the DOSCALLS module are only supported for ordinal references. References to the DOSCALLS module by name strings are not supported and return an error. Dynamic link ordinal numbers for DOSCALLS routines are resolved by linking with DOSCALLS.LIB.
- ProcAddress (PFN FAR *) - output: Procedure address.
Return Code
rc (USHORT) - return:Return code descriptions are:
- 0 NO_ERROR
- 6 ERROR_INVALID_HANDLE
- 95 ERROR_INTERRUPT
- 127 ERROR_PROC_NOT_FOUND
Remarks
A 32-bit address, consisting of a selector and offset, is returned for a specified procedure.
To free the dynamic link module, issue DosFreeModule. After DosFreeModule is issued, procedure entry addresses returned for this handle or no longer valid.
Other run-time dynamic link calls are DosLoadModule, DosGetModName, and DosGetModHandle.
Bindings
C
#define INCL_DOSMODULEMGR USHORT rc = DosGetProcAddr(ModuleHandle, ProcName, ProcAddress); HMODULE ModuleHandle; /* Module handle */ PSZ ProcName; /* Module name string */ PFN FAR *ProcAddress; /* Procedure address (returned) */ USHORT rc; /* return code */
MASM
EXTRN DosGetProcAddr:FAR INCL_DOSMODULEMGR EQU 1 PUSH WORD ModuleHandle ;Module handle PUSH@ ASCIIZ ProcName ;Module name string PUSH@ DWORD ProcAddress ;Procedure address (returned) CALL DosGetProcAddr Returns WORD