This example loads, queries, and then frees the dynamic link module "DISPLAY.DLL".
#define INCL_DOSMODULEMGR /* Module Manager values */ #define INCL_DOSERRORS /* Error values */ #include <os2.h> #include <stdio.h> int main(VOID) { PSZ ModuleName = "C:\\OS2\\DLL\\DISPLAY.DLL"; /* Name of module */ UCHAR LoadError[256] = ""; /* Area for Load failure information */ HMODULE ModuleHandle = NULLHANDLE; /* Module handle */ PFN ModuleAddr = 0; /* Pointer to a system function */ ULONG ModuleType = 0; /* Module type */ APIRET rc = NO_ERROR; /* Return code */ rc = DosLoadModule(LoadError, /* Failure information buffer */ sizeof(LoadError), /* Size of buffer */ ModuleName, /* Module to load */ &ModuleHandle); /* Module handle returned */ if (rc != NO_ERROR) { printf("DosLoadModule error: return code = %u\n", rc); return 1; } else { printf("Module %s loaded.\n", ModuleName); } /* endif */ rc = DosQueryProcAddr(ModuleHandle, /* Handle to module */ 1L, /* No ProcName specified */ NULL, /* ProcName (not specified) */ &ModuleAddr); /* Address returned */ if (rc != NO_ERROR) { printf("DosQueryProcAddr error: return code = %u\n", rc); return 1; } else printf("Address of module is 0x%x.\n", ModuleAddr); rc = DosQueryProcType(ModuleHandle, /* Handle to module */ 1L, /* Indicate no ProcName given */ NULL, /* ProcName (not specified) */ &ModuleType); /* Type 0=16-bit 1=32-bit */ if (rc != NO_ERROR) { printf("DosQueryProcType error: return code = %u\n", rc); return 1; } else printf("This is a %s module.\n", ( ModuleType ? "32-bit" : "16-bit")); rc = DosFreeModule(ModuleHandle); if (rc != NO_ERROR) { printf("DosFreeModule error: return code = %u\n", rc); return 1; } else printf("Module %s freed.\n", ModuleName); return NO_ERROR; }