Determines whether the calling process has read access to the memory at the specified address.
BOOL IsBadCodePtr( FARPROC lpfn );
A pointer to a memory address.
If the calling process has read access to the specified memory, the return value is zero.
If the calling process does not have read access to the specified memory, 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 the specified memory location, 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.
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.
|Minimum supported client||Windows XP [desktop apps only]|
|Minimum supported server||Windows Server 2003 [desktop apps only]|
|Header||winbase.h (include Windows.h)|