_CrtReportBlockType

發行項
06/09/2015

傳回與指定的偵錯堆積區塊指標相關聯的區塊類型/子類型。

int _CrtReportBlockType( 
   const void * pBlock 
};

參數

pBlock
有效偵錯堆積區塊的指標。

傳回值

當已經傳遞有效偵錯堆積指標時，_CrtReportBlockType函式會將區塊類型及子類型以的int形式傳回。當傳遞無效指標時，函式會傳回 -1。

備註

若要擷取由 _CrtReportBlockType傳回的類型與子類型，請使用傳回值巨集 _BLOCK_TYPE 和 _BLOCK_SUBTYPE (皆由 Crtdbg.h 定義)。

如需配置區塊類型的資訊以及它們的使用方式，請參閱在偵錯堆積中的區塊類型。

需求

常式	必要的標頭
_CrtReportBlockType	<crtdbg.h>

如需更多關於相容性的資訊，請參閱入門介紹中的相容性 (Compatibility) 。

程式庫

C run-time libraries 版本的偵錯

範例

// 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);
}

範例輸出

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.