National Instruments Drums 320685D-01 ユーザーズマニュアル

Chapter 1

LabWindows/CVI Compiler

©

 National Instruments Corporation

1-11

LabWindows/CVI Programmer Reference Manual

Dynamic memory protection errors report illegal operations with dynamic memory and 
corrupted dynamic memory during allocation and deallocation. 

LabWindows/CVI generates memory deallocation errors when the pointer is not the result of 
a memory allocation. The following user protection errors involve memory deallocation:

•

Attempt to free uninitialized pointer

•

Attempt to free pointer to freed memory

•

Attempt to free invalid pointer expression

•

Attempt to free pointer not allocated with 

malloc

 or 

calloc

LabWindows/CVI generates memory corruption errors when a memory 
allocation/deallocation detects corrupted memory. During each dynamic memory operation, 
LabWindows/CVI verifies the integrity of the memory blocks it uses in the operation. When 
you set the Debugging Level to Extended, LabWindows/CVI thoroughly checks all dynamic 
memory on each memory operation. LabWindows/CVI generates the following error when it 
discovers a problem: 

Dynamic memory is corrupt

.

LabWindows/CVI also checks for stack overflow and missing return values:

•

Stack overflow (fatal)

•

Missing return value (non-fatal)

The missing return value error means that a non-void function (one you do not declare with 

void

 return type) returned, but did not returned a value.

Library functions sometimes generate errors when they receive invalid arguments. 
LabWindows/CVI error checking is sensitive to the requirements of each library function. 
The following errors involve library protection:

•

Null pointer argument to library function

•

Uninitialized pointer argument to library function

•

Passing a pointer to freed memory to a library function

•

Array argument too small

•

Passing by reference a scalar argument to a library function that expects an array

00ProRef.book : 06chap01.fm  Page 11  Monday, March 9, 1998  3:23 PM