DosQueryResourceSize
DosQueryResourceSize returns the size of the specified resource object.
Resource objects are read-only data objects that can be accessed dynamically at run time. The access key is two numbers. The first number is a type ID; the second, a name ID. These are similar to the file-extension and file-name portions of a file name.
Resource objects are placed into an executable file by the Resource Compiler (RC.EXE).
This function obtains the size of resources loaded from 16-bit executable files or dynamic link libraries (DLLs), since the size is not explicitly stored in most resources.
Syntax
DosQueryResourceSize (hmod, idt, idn, pulsize)
Parameters
- hmod (HMODULE) - input
- The handle of the module that has the required resource.
- A value of zero means to get the size from the current process. A value other than zero is a module handle that was returned by DosLoadModule.
- idt (ULONG) - input
- The type identifier of the resource.
- Possible values are between 1 and 0xFFFE inclusive. Values from 1 to 255 are reserved for predefinition. Values from 256 and on can be type defined for the resource. The fist 21 values are predefined as follows:
- RT_POINTER Mouse pointer shape
- RT_BITMAP Bit map
- RT_MENU Menu template
- RT_DIALOG Dialog template
- RT_STRING String tables
- RT_FONTDIR Font directory
- RT_FONT Font
- RT_ACCELTABLE Accelerator tables
- RT_RCDATA Binary data
- RT_MESSAGE Error message tables
- RT_DLGINCLUDE Dialog include file name
- RT_VKEYTBL Key to vkey tables
- RT_KEYTBL Key to UGL tables
- RT_CHARTBL Glyph to character tables
- RT_DISPLAYINFO Screen display information
- RT_FKASHORT Function key area short form
- RT_FKALONG Function key area long form
- RT_HELPTABLE Help table for Help manager
- RT_HELPSUBTABLE Help subtable for Help manager
- RT_FDDIR DBCS unique/font driver directory
- RT_FD DBCS unique/font driver
- idn (ULONG) - input
- The name identifier of the resource.
- Possible values are between 1 and 0xFFFE inclusive.
- pulsize (PULONG) - output
- A pointer to a ULONG in which the size, in bytes, of the resource is returned.
Return Code
- ulrc (APIRET) - returns
- DosQueryResourceSize returns one of the following values:
- 0 NO_ERROR
- 6 ERROR_INVALID_HANDLE
- 87 ERROR_INVALID_PARAMETER
Example Code
This example loads the dynamic link module "DISPLAY.DLL", and queries the size of the font directory id=1 resource.
#define INCL_DOSRESOURCES /* Resource types */
#define INCL_DOSMODULEMGR /* Module Manager values */
#define INCL_DOSERRORS /* DOS error values */
#include <os2.h>
#include <stdio.h>
int main(VOID) {
UCHAR LoadError[256] = ""; /* Area for Load failure information */
PSZ ModuleName = "C:\\OS2\\DLL\\PMWP.DLL"; /* DLL with resources */
HMODULE ModHandle = NULLHANDLE; /* Handle for module */
ULONG Size = 0; /* Resource size */
APIRET rc = NO_ERROR; /* API return code */
rc = DosLoadModule(LoadError, /* Failure information buffer */
sizeof(LoadError), /* Size of buffer */
ModuleName, /* Module to load */
&ModHandle); /* Module handle returned */
if (rc != NO_ERROR) {
printf("DosLoadModule error: return code = %u\n", rc);
return 1;
}
rc = DosQueryResourceSize(ModHandle, /* Handle for DLL containing resources */
RT_POINTER, /* Ask for Pointer */
1L, /* with an ID of 1 */
&Size); /* The resource size is returned. */
if (rc != NO_ERROR) {
printf("DosGetResource error: return code = %u\n", rc);
return 1;
} else {
printf("Resource is %u bytes in size.\n", Size);
} /* endif */
return NO_ERROR;
}