DosGetResource (OS/2 1.x)
This call returns the segment selector of the specified resource segment.
DosGetResource (ModHandle, TypeID, NameID, Selector)
- ModHandle (HMODULE) - input
- The location of the resource segment.
- 0 - The executable file of the current process.
- <> 0 - A handle to a dynamic link module returned by DosLoadModule.
- TypeID (USHORT) - input
- A 16 bit resource type ID (see Remarks).
- NameID (USHORT) - input
- A 16 bit resource name ID (see Remarks).
- Selector (PSEL) - output
- The address of a word where the resource segment selector is returned.
- rc (USHORT) - return
- Return code descriptions are:
- 0 NO_ERROR
- 6 ERROR_INVALID_HANDLE
Resource segments are read-only data segments that can be accessed dynamically at run time. The access key consists of two 16-bit numbers, the first of which is a type ID and the second, a name ID. These numbers are similar in concept to the file extension and file name portions of a file name.
The advantage of resource segments is that they can be bundled into an application's executable file, so a single file contains all of the code and data for an application.
It is recommended that resource segments obtained through DosGetResource only be freed using DosFreeSeg.
OS/2 Version 1.2 added two new functions, DosGetResource2 and DosFreeResource, to load and free an application specific resource. DosGetResource2 returns a far pointer to a resource rather than the selector returned via DosGetResource. It is recommended that applications targeted for OS/2 1.2 use DosGetResource2 and DosFreeResource. Applications that wish to execute on OS/2 1.1 and 1.2 should use the OS/2 run-time dynamic link capabilities, DosLoadModule and DosGetProcAddr, to get the address of DosGetResource2 and DosFreeResource when executing on OS/2 1.2. If the DosGetProcAddr call to obtain the address of DosGetResource2 and DosFreeResource fails, the application can call DosGetResource and DosFreeSeg. Applications that use DosGetResource2 and DosFreeResource allow OS/2 to optimize memory allocation associated with the applications resource.
#define INCL_DOSRESOURCES USHORT rc = DosGetResource(ModHandle, TypeID, NameID, Selector); HMODULE ModHandle; /* Module handle to get resource from */ USHORT TypeID; /* 16 bit resource type ID */ USHORT NameID; /* 16 bit resource name ID */ PSEL Selector; /* where to return selector */ USHORT rc; /* return code */
EXTRN DosGetResource:FAR INCL_DOSRESOURCES EQU 1 PUSH WORD ModHandle ;Module handle to get resource from PUSH WORD TypeID ;16 bit resource type ID PUSH WORD NameID ;16 bit resource name ID PUSH@ WORD Selector ;Resource selector (returned) CALL DosGetResource Returns WORD