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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| Yes
| Import Library
| kernel32.lib
| Header File
| winbase.h
| Unicode
| No
| Platform Notes
| None
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IsBadReadPtr
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
| );
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Parameters
lp
Points to the first byte of the memory block.
ucb
Specifies the size, in bytes, of the memory block. If this parameter is zero,
the return value is zero.
Return Values
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
Remarks
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.
See Also
IsBadHugeReadPtr, IsBadHugeWritePtr, IsBadStringPtr, IsBadWritePtr
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