National Instruments 320685D-01 ユーザーズマニュアル
Chapter 1
LabWindows/CVI Compiler
LabWindows/CVI Programmer Reference Manual
1-16
©
National Instruments Corporation
Library Functions
The LabWindows/CVI library functions that take pointer arguments or that return pointers
incorporate run-time checking for those arguments and return values. However, you must be
careful when passing arguments to library functions that have
incorporate run-time checking for those arguments and return values. However, you must be
careful when passing arguments to library functions that have
void *
parameters, such as
GetCtrlAttribute
and
GetCtrlVal
in the User Interface Library and
memcpy
and
memset
in the ANSI C library. If you use a
void *
cast when you pass an argument to a
function that expects a variably typed argument, you disable run-time checking for that
argument. Some examples follow:
argument. Some examples follow:
{
int value;
GetCtrlVal(panel, ctrl, &value);
/* CORRECT
*/
GetCtrlVal(panel, ctrl, (void *)&value);/* INCORRECT */
}
{
char *names[N], *namesCopy[N];
memcpy(namesCopy, names, sizeof (names));/* CORRECT
*/
memcpy((void *)namesCopy, (void *)names, sizeof names);
/* INCORRECT */
}
Unions
LabWindows/CVI performs only minimal checks for
union
type variables. If a union
contains pointers, arrays, or structs, LabWindows/CVI does not maintain user protection
information for those objects.
information for those objects.
Stack Size
Your program uses the stack for passing function parameters and storing automatic local
variables. You can set the maximum stack size by selecting the Options»Run Options in the
Project window. Table 1-3 shows the stack size ranges LabWindows/CVI supports.
variables. You can set the maximum stack size by selecting the Options»Run Options in the
Project window. Table 1-3 shows the stack size ranges LabWindows/CVI supports.
Table 1-3. Stack Size Ranges for LabWindows/CVI
Platform
Minimum
Default
Maximum
Windows 3.1
4 KB
40 KB
40 KB
Windows 95/NT
100 KB
250 KB
1 MB
Solaris 1 for Sun
100 KB
250 KB
5 MB
Solaris 2 for Sun
100 KB
250 KB
5 MB
00ProRef.book : 06chap01.fm Page 16 Monday, March 9, 1998 3:23 PM