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Chapter 4 Windows 3.1 Compiler/Linker Issues
LabWindows/CVI Programmer Reference Manual 4-16
©
National Instruments Corporation
Case 1
Assume the DLL has the following function:
char *f(char *ptr)
{
sprintf(ptr, "hello");
return ptr;
}
Then assume that a program in LabWindows/CVI uses the function f as follows:
char buffer[240];
char *bufptr;
bufptr = f(buffer);
printf("%s", bufptr);
You would have to modify the glue code as shown here:
char * f(char *ptr)
{
char * retval;
unsigned short cw387;
cw387 = Get387CW();
retval = (char *) InvokeIndirectFunction(__static_f, ptr);
Set387CW(cw387);
retval = MapAliasToFlat(retval); /* Add this line to */
/* glue code. */
return retval;
}
Case 2
Assume the DLL has the following function:
char *f(void)
{
char *ptr;
ptr = malloc(100);
sprintf(ptr, "hello");
return ptr;
}
00ProRef.book : 06chap04.fm Page 16 Monday, March 9, 1998 3:23 PM