C语言获取Windows总CPU使用率.

#include <windows.h>#include <stdio.h>#include <conio.h>double FileTimeToDouble(FILETIME* pFiletime){return (double)((*pFiletime).dwHighDateTime * 4.294967296E9) + (double)(*pFiletime).dwLowDateTime;}double m_fOldCPUIdleTime;double m_fOldCPUKernelTime;double m_fOldCPUUserTime;BOOL Initialize() {FILETIME ftIdle, ftKernel, ftUser;BOOL flag = FALSE;if (flag = GetSystemTimes(&ftIdle, &ftKernel, &ftUser)){m_fOldCPUIdleTime = FileTimeToDouble(&ftIdle);m_fOldCPUKernelTime = FileTimeToDouble(&ftKernel);m_fOldCPUUserTime = FileTimeToDouble(&ftUser);}return flag;}int GetCPUUseRate(){int nCPUUseRate = -1;FILETIME ftIdle, ftKernel, ftUser;if (GetSystemTimes(&ftIdle, &ftKernel, &ftUser)){double fCPUIdleTime = FileTimeToDouble(&ftIdle);double fCPUKernelTime = FileTimeToDouble(&ftKernel);double fCPUUserTime = FileTimeToDouble(&ftUser);nCPUUseRate= (int)(100.0 - (fCPUIdleTime - m_fOldCPUIdleTime) / (fCPUKernelTime - m_fOldCPUKernelTime + fCPUUserTime - m_fOldCPUUserTime)*100.0);m_fOldCPUIdleTime = fCPUIdleTime;m_fOldCPUKernelTime = fCPUKernelTime;m_fOldCPUUserTime = fCPUUserTime;}return nCPUUseRate;}int main(){if (!Initialize()){getch();return -1;}else{Sleep(1000);printf("%d",GetCPUUseRate());}return 0;}