DosQueryProcAddr: Difference between revisions
Created page with "==DosQueryProcAddr== ===Syntax=== rc = DosQueryProcAddr( ''hMod'', ''ulOrdinal'', ''pszProcName'', ''pProcAddr'' ); ===Parameters=== ; HMODULE ''hMod'' (input) : Handle for ..." |
|||
| Line 67: | Line 67: | ||
===See Also=== | ===See Also=== | ||
DosLoadModule, DosFreeModule | [[OS2 API:DosLoadModule|DosLoadModule]], [[OS2 API:DosFreeModule|DosFreeModule]] | ||
[[Category:The OS/2 API Project]] | [[Category:The OS/2 API Project]] | ||
Revision as of 19:16, 29 June 2012
DosQueryProcAddr
Syntax
rc = DosQueryProcAddr( hMod, ulOrdinal, pszProcName, pProcAddr );
Parameters
- HMODULE hMod (input)
- Handle for the module to be queried (from DosLoadModule).
- ULONG ulOrdinal (input)
- Ordinal number for the sought process. If 0 then pszProcName is used.
- PSZ pszProcName (input)
- Pointer to string containing the sought processes name. Not case sensitive.
- PFN* pProcAddr (output)
- Address of a function pointer, which will contain the address of the procedure.
Returns
- APIRET rc
- Indicates if any error occured.
| 0 | NO_ERROR |
| 6 | ERROR_INVALID_HANDLE |
| 123 | ERROR_INVALID_NAME |
| 65079 | ERROR_ENTRY_IS_CALLGATE |
Include Info
- define INCL_DOSMODULEMGR
#include <os2.h>
Usage Explanation
DosQueryProcAddr is used to find the address of a process in a dynamic link module.
Relevant Structures
Gotchas
Sample Code
void (* my_dll_function)(int, char*); /* Pointer to process */
HMODULE hmod;
APIRET rc = 0;
/* Load DLL and get hmod with DosLoadModule*/
/* Get address for process in DLL */
rc = DosQueryProcAddr(hmod, 0, "MY_DLL_FUNCTION", (PFN *) my_dll_function);
if(rc) { /* Failure? */
printf("Error. Cannot get the address for my_dll_function. DosQueryProcAddr returned %d.\n",rc);
return(-1);
}
/* Call my_dll_function */
my_dll_function(4711,"Hello World!\n");