| 术语 | queryperformancefrequency |
| 释义 | QueryPerformanceFrequency 语法： BOOL QueryPerformanceFrequency( LARGE_INTEGER *lpFrequency ); QueryPerformanceFrequency的功能 该QueryPerformanceFrequency的函数检索高分辨率性能计数器的频率，如果存在。的频率不能改变，而在系统运行。 参数 lpFrequency [out]指向一个变量接收每分每秒，目前的性能计数器频率。如果安装的硬件不支持高分辨率的性能计数器，这个参数可以是零。 返回值 如果安装的硬件支持高分辨率性能计数器，返回值为非零值。 如果函数失败，返回值是零。为了获得更多错误信息，调用GetLastError。例如，如果安装的硬件不支持高分辨率的性能计数器，功能失败。 功能信息 最低DLL版本 kernel32.dll 在Winbase.h HeaderDeclared，头文件：winuser.h import libraryKernel32.lib 最低操作系统Windows 95，Windows NT 3.1 UnicodeImplemented为Unicode版本。 参见 定时器概述，QueryPerformanceCounter的 ＝＝英文原文＝＝QueryPerformanceFrequency Function The QueryPerformanceFrequency function retrieves the frequency of the high-resolution performance counter, if one exists. The frequency cannot change while the system is running. Syntax BOOL QueryPerformanceFrequency( LARGE_INTEGER *lpFrequency ); Parameters lpFrequency [out] Pointer to a variable that receives the current performance-counter frequency, in counts per second. If the installed hardware does not support a high-resolution performance counter, this parameter can be zero. Return Value If the installed hardware supports a high-resolution performance counter, the return value is nonzero. If the function fails, the return value is zero. To get extended error information, call GetLastError . For example, if the installed hardware does not support a high-resolution performance counter, the function fails. Function Information Minimum DLL Versionkernel32.dll HeaderDeclared in Winbase.h, include Windows.h Import libraryKernel32.lib Minimum operating systemsWindows 95, Windows NT 3.1 UnicodeImplemented as Unicode version. See Also Timers Overview , QueryPerformanceCounter ＝＝原始网址＝＝http://msdn.microsoft.com/en-us/library/ms644905(VS.85).aspx\n |
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