National Instruments 320685D-01 Manuel D’Utilisation

Chapter 4

Windows 3.1 Compiler/Linker Issues

LabWindows/CVI Programmer Reference Manual

4-20

©

 National Instruments Corporation

int g(struct x *ptr)

{

int retval;

unsigned short cw387;

char *savedPointer;

savedPointer = ptr->name;

if (Alloc16BitAlias(ptr->name, ITEM_SIZE, &ptr->name) == -1)

return <

error code>;

cw387 = Get387CW();

retval = (int) InvokeIndirectFunction(__static_g, ptr);

Set387CW(cw387);

Free16BitAlias(ptr->name, ITEM_SIZE);

ptr->name = savedPointer;

return retval;

}

If your DLL does not export its functions by name, but by ordinal number only, you must 
modify the 

GetProcAddress 

function calls in the glue code. Instead of passing the name of 

the function as the second parameter, pass 

PASS_WORD_AS_POINTER(

OrdinalNumber)

, 

where 

OrdinalNumber

 is the ordinal number for the function. For example, if the ordinal 

number for the function 

InstallCallback

 is 5, change the glue code as follows.

Generated Glue Code:

if (!(fp = GetProcAddress(DLLHandle,"InstallCallback")))

{

funcname = "_InstallCallback";

goto FunctionNotFoundError;

}

Change to:

if (!(fp = GetProcAddress(DLLHandle, PASS_WORD_AS_POINTER(5))))

{

funcname = "_InstallCallback";

goto FunctionNotFoundError;

}

00ProRef.book : 06chap04.fm  Page 20  Monday, March 9, 1998  3:23 PM