GetProcessHandleCount 中的值不正确
我遇到了函数 GetProcessHandleCount() 的奇怪行为。 首先，我按照 msdn 中的描述拍摄系统中所有进程的快照：
HANDLE hProcessSnap;
HANDLE hProcess;
PROCESSENTRY32 pe32;
hProcessSnap = CreateToolhelp32Snapshot( TH32CS_SNAPPROCESS, 0 );
pe32.dwSize = sizeof( PROCESSENTRY32 );
if( !Process32First( hProcessSnap, &pe32 ) )
{
CloseHandle( hProcessSnap );
return 0;
}
然后我遍历进程的快照，并使用函数计算打开的句柄 GetProcessHandleCount：
int count_of_handles=0;
DWORD dwHandleCount=0;
do {
hProcess = OpenProcess( PROCESS_QUERY_INFORMATION,FALSE,pe32.th32ProcessID);
GetProcessHandleCount(hProcess,&dwHandleCount);
count_of_handles+=dwHandleCount;
if( hProcess != NULL )
CloseHandle( hProcess );
} while( Process32Next( hProcessSnap, &pe32 ) );
我在Windows 7 x64中检查了这个程序。程序显示 count_of_handles ~16000，但实际上该值约为 100 000（如果相信 Windows 任务管理器）。
然后我在 Windows XP x32（由 VMWare）中执行该程序，count_of_handles 约为 9000（但实际上约为 8000）。
我的代码有什么问题吗？谢谢。
I faced with strange behavior of function GetProcessHandleCount().
At first I take a snapshot of all processes in the system as it is described in msdn:
HANDLE hProcessSnap;
HANDLE hProcess;
PROCESSENTRY32 pe32;
hProcessSnap = CreateToolhelp32Snapshot( TH32CS_SNAPPROCESS, 0 );
pe32.dwSize = sizeof( PROCESSENTRY32 );
if( !Process32First( hProcessSnap, &pe32 ) )
{
CloseHandle( hProcessSnap );
return 0;
}
Then I walk the snapshot of processes, and count up open handles by using function
GetProcessHandleCount:
int count_of_handles=0;
DWORD dwHandleCount=0;
do {
hProcess = OpenProcess( PROCESS_QUERY_INFORMATION,FALSE,pe32.th32ProcessID);
GetProcessHandleCount(hProcess,&dwHandleCount);
count_of_handles+=dwHandleCount;
if( hProcess != NULL )
CloseHandle( hProcess );
} while( Process32Next( hProcessSnap, &pe32 ) );
I checked this program in Windows 7 x64. Program displayed count_of_handles ~16000, but really this value was ~100 000 (if believe in Windows Task Manager).
Then I executed this program in Windows XP x32 (by VMWare), and count_of_handles was ~9000 (but in real it was ~8000).
What is wrong with my code? Thank you.
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评论（2）
一方面，
GetProcessHandleCount可能会返回零（表示错误）。这可以解释为什么结果低于您的预期。这可能是由OpenProcess 引起的失败（您也不检查）。For one thing,
GetProcessHandleCountmight return zero (which signifies an error). This could explain coming to a result lower than what you expect. This might be caused in turn byOpenProcessfailing (you don't check for that either).以及Jon 的原因、任务管理器中的值1< /sup> 包括内核中打开的句柄 - 这些不会包含在跨进程的总数中。
1 对于这种事情 Process Explorer 是更有效。包括能够列出每个进程以及内核中的打开句柄，以及 Process Explorer 列表中的
系统伪进程。As well as Jon's reason, the value from Task Manager1 includes handles open in the kernel – these will not be included in your total across processes.
1 For this kind of thing Process Explorer is far more effective. Including being able to list open handles per process and in the kernel, the
systempseudo-process in Process Explorer's listing.