PdhAddCounter的使用问题

[coolmei25]

我现在的语句是:
string str = "\\Processor(QQ)\\% Processor Time";
pdhStatus = PdhAddCounter ( hQuery ,
(LPWSTR)str.c_str(),
0 ,
pCounterHandle ) ;
返回的错误代码是:0xc0000bc0,含义是:PDH_CSTATUS_BAD_COUNTERNAME

如果把参数二改成:
const wchar_t str1[] = _TEXT ("\\Process(QQ)\\%Processor Time");
调用PdhAddCounter (...), 返回的错误是0xc0000bb9,含义是PDH_CSTATUS_NO_COUNTER

请问大家，我的这个地方应该怎么写才对,不胜感激

[baihacker]

下面的明显错了,用的是多字符字符串,然后类型强转为宽字符,不对
string str = "\\Processor(QQ)\\% Processor Time";
pdhStatus = PdhAddCounter ( hQuery ,
(LPWSTR)str.c_str(),
0 ,
pCounterHandle ) ;


在指明了用宽字符的情况下,尝试使用兼容字符不对,应该直接指定用宽字符如下
const wchar_t str1[] = L"\\Process(QQ)\\%Processor Time";

[coolmei25]

按楼上提示，将语句改成了：
const wchar_t str1[] = L"\\Process(QQ)\\%Processor Time";
pdhStatus = PdhAddCounter ( hQuery ,
str1,
0 ,
pCounterHandle ) ;
结果依然是：0xc0000bb9：PDH_CSTATUS_NO_COUNTER

str1在内存中形式如下：
5c 00 50 00 72 00 6f 00 63 00 65 00 73 00 73 00 28 00 51 00 51 00 29 \.P.r.o.c.e.s.s.(.Q.Q.)
0x0012F797 00 5c 00 25 00 50 00 72 00 6f 00 63 00 65 00 73 00 73 00 6f 00 72 00 .\.%.P.r.o.c.e.s.s.o.r.
0x0012F7AE 20 00 54 00 69 00 6d 00 65 00 00 00 cc cc cc cc cc cc cc cc cc cc 00 .T.i.m.e

所以肯定是宽字符形式的，请大家帮忙分析一下，为什么会没有添加上计数器呢？

[coolmei25]

前面的代码如下：
#include <stdio.h>
#include <windows.h>
#include <tlhelp32.h>
#include <pdh.h>
#include <tchar.h>
#include <pdhmsg.h>
#pragma comment ( lib , "Pdh.lib" )

......

HQUERY hQuery;
HCOUNTER *pCounterHandle;
PDH_STATUS pdhStatus;
PDH_FMT_COUNTERVALUE fmtValue;
DWORD ctrType;
CHAR szPathBuffer[1024] = {'\0'};
int nRetCode = 0;

// Open the query object.
pdhStatus = PdhOpenQuery (0, 0, &hQuery);

if ( pdhStatus != ERROR_SUCCESS )
{
return -1;
}

pCounterHandle = (HCOUNTER *)GlobalAlloc(GPTR, sizeof(HCOUNTER));

if ( pCounterHandle == NULL )
{
return -1;
}

const wchar_t str1[] = L"\\Process(QQ)\\%Processor Time";

pdhStatus = PdhAddCounter ( hQuery ,
str1,
0 ,
pCounterHandle ) ;

if (pdhStatus != ERROR_SUCCESS)
{
return -1;
}
........

[coolmei25]

自己顶顶，在线等！请大家帮忙呀！！不胜感激

[yuncong8]

计数器名称
\\Process(QQ)\\%% Processor Time