Tests any memory address to ensure that it is contained entirely within the program's memory space.

测试任何内存地址,以确保它是完全包含在程序的内存空间。

BOOL AfxIsValidAddress(
   const void* lp,
   UINT nBytes,
   BOOL bReadWrite = TRUE 
);

Parameters

lp: Points to the memory address to be tested.; 指向被测试内存。
nBytes: Contains the number of bytes of memory to be tested.; 包含被测试内存的字节个数。
bReadWrite: Specifies whether the memory is both for reading and writing (TRUE) or just reading (FALSE).; 确定被测试内存是读写形式（真）还是只读形式（假）。

Return Value

In debug builds, nonzero if the specified memory block is contained entirely within the program's memory space; otherwise 0.

在调试版，如果指定的内存被完全包含在程序的内存空间，返回值不为0，否则为0.

In non-debug builds, nonzero if lp is not NULL; otherwise 0.

在调试构建，如果lp不为空，返回值不为0，否则返回值为0.

Remarks

The address is not restricted to blocks allocated by new.

地址不仅限于模块分配新的地址。

Example

// Allocate a 5 character array, which should have a valid memory address.
char* arr = new char[5];

// Create a null pointer, which should be an invalid memory address.
char* null = (char*)0x0;

ASSERT(AfxIsValidAddress(arr, 5));
ASSERT(!AfxIsValidAddress(null, 5));

Requirements

Header: afx.h

AfxIsValidAddress

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AfxIsValidAddress 测试内存地址

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Parameters

Return Value

Remarks

Example

Requirements