The IsBadReadPtr function verifies that the calling process has read access to the specified range of memory.
BOOL IsBadReadPtr(
CONST VOID *lp, |
// address of memory block |
UINT ucb |
// size of block |
); |
If the calling process has read access to all bytes in the specified memory range, the return value is zero.
If the calling process does not have read access to all bytes in the specified memory range, the return value is nonzero. To get extended error information, call GetLastError
If the application is compiled as a debugging version, and the process does not have read access to all bytes in the specified memory range, the function causes an assertion and breaks into the debugger. Leaving the debugger, the function continues as usual, and returns a nonzero value This behavior is by design, as a debugging aid.
If the calling process has read access to some, but not all, of the bytes in the specified memory range, the return value is nonzero.
In a preemptive multitasking environment, it is possible for some other thread to change the process’s access to the memory being tested. Even when the function indicates that the process has read access to the specified memory, you should use structured exception handling when attempting to access the memory. Use of structured exception handling enables the system to notify the process if an access violation exception occurs, giving the process an opportunity to handle the exception.
IsBadHugeReadPtr, IsBadHugeWritePtr, IsBadStringPtr, IsBadWritePtr
file: /Techref/os/win/api/win32/func/src/f51_13.htm, 3KB, , updated: 2000/4/7 12:19, local time: 2024/8/23 19:06,
18.116.90.81:LOG IN
|
©2024 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions? <A HREF="http://massmind.org/Techref/os/win/api/win32/func/src/f51_13.htm"> IsBadReadPtr</A> |
Did you find what you needed? |
Welcome to massmind.org! |
Ashley Roll has put together a really nice little unit here. Leave off the MAX232 and keep these handy for the few times you need true RS232! |
.