_CrtReportBlockType

返回与给定调试堆块指针相关联的块类型/子类型。

语法

int _CrtReportBlockType(
   const void * pBlock
};

参数

pBlock
指向有效调试堆块的指针。

返回值

当传递有效的调试堆指针时，_CrtReportBlockType 函数以int 形式返回块类型和子类型。 当传递了无效的指针时，该函数返回 -1。

备注

要提取 _CrtReportBlockType 返回的类型和子类型，请对返回值使用 _BLOCK_TYPE 和 _BLOCK_SUBTYPE 宏（两者均在 Crtdbg.h 中定义）。

若要了解分配块类型及其使用方式，请参阅调试堆上的块类型。

要求

例程	必需的标头
_CrtReportBlockType	<crtdbg.h>

有关兼容性的详细信息，请参阅 兼容性。

库

仅限 C 运行时库的调试版本。

示例

// crt_crtreportblocktype.cpp
// compile with: /MDd

#include <malloc.h>
#include <stdio.h>
#include <crtdbg.h>

void __cdecl Dumper(void *ptr, void *)
{
    int block = _CrtReportBlockType(ptr);
    _RPT3(_CRT_WARN, "Dumper found block at %p: type %d, subtype %d\n", ptr,
          _BLOCK_TYPE(block), _BLOCK_SUBTYPE(block));
}

void __cdecl LeakDumper(void *ptr, size_t sz)
{
    int block = _CrtReportBlockType(ptr);
    _RPT4(_CRT_WARN, "LeakDumper found block at %p:"
                     " type %d, subtype %d, size %d\n", ptr,
          _BLOCK_TYPE(block), _BLOCK_SUBTYPE(block), sz);
}

int main(void)
{
    _CrtSetDbgFlag(_CrtSetDbgFlag(_CRTDBG_REPORT_FLAG) |
    _CRTDBG_LEAK_CHECK_DF);
    _CrtSetReportMode( _CRT_WARN, _CRTDBG_MODE_FILE );
    _CrtSetReportFile( _CRT_WARN, _CRTDBG_FILE_STDOUT );
    _malloc_dbg(10, _NORMAL_BLOCK , __FILE__, __LINE__);
    _malloc_dbg(10, _CLIENT_BLOCK | (1 << 16), __FILE__, __LINE__);
    _malloc_dbg(20, _CLIENT_BLOCK | (2 << 16), __FILE__, __LINE__);
    _malloc_dbg(30, _CLIENT_BLOCK | (3 << 16), __FILE__, __LINE__);
    _CrtDoForAllClientObjects(Dumper, NULL);
    _CrtSetDumpClient(LeakDumper);
}

示例输出

Dumper found block at 00314F78: type 4, subtype 3
Dumper found block at 00314F38: type 4, subtype 2
Dumper found block at 00314F00: type 4, subtype 1
Detected memory leaks!
Dumping objects ->
crt_crtreportblocktype.cpp(30) : {55} client block at 0x00314F78, subtype 3, 30 bytes long.
Data: <                > CD CD CD CD CD CD CD CD CD CD CD CD CD CD CD CD
crt_crtreportblocktype.cpp(29) : {54} client block at 0x00314F38, subtype 2, 20 bytes long.
Data: <                > CD CD CD CD CD CD CD CD CD CD CD CD CD CD CD CD
crt_crtreportblocktype.cpp(28) : {53} client block at 0x00314F00, subtype 1, 10 bytes long.
Data: <          > CD CD CD CD CD CD CD CD CD CD
crt_crtreportblocktype.cpp(27) : {52} normal block at 0x00314EC8, 10 bytes long.
Data: <          > CD CD CD CD CD CD CD CD CD CD
Object dump complete.

另请参阅

_CrtDoForAllClientObjects
_CrtSetDumpClient
_CrtMemDumpAllObjectsSince
_CrtDumpMemoryLeaks