WINCE 微秒、毫秒级延时函数

void delay_us(int n){ 

LARGE_INTEGER litmp; 
LONGLONG QPart1,QPart2; 
double dfMinus, dfFreq, dfTim; 
if(QueryPerformanceFrequency(&litmp)==FALSE) 
   { 
       MessageBox(NULL,TEXT("Error：QueryPerformanceFrequency"),TEXT("Error"),MB_OK); 
       return;
   } 
dfFreq = (double)litmp.QuadPart; 
QueryPerformanceCounter(&litmp); 
QPart1 = litmp.QuadPart; 
do 
 { 
   QueryPerformanceCounter(&litmp); 
   QPart2=litmp.QuadPart; 
   dfMinus=(double)(QPart2-QPart1); 
   dfTim=dfMinus/dfFreq; 
 }while(dfTim <0.000001*n); 

}
//毫秒级的延时函数
void   delay_ms(DWORD   tmp_time)   
{   
 DWORD   start;   
 DWORD   time_i=0;   
 start=GetTickCount();   
 while(time_i<=tmp_time)   
  {   
     time_i=GetTickCount()-start;   
  }  
}

转自：http://blog.163.com/mg29_x/blog/static/60304826200812911148146/