AllenZh请帮帮我!

人笨真的是没办法,虽然看了你发的那两个函数的说明,但我还是不太懂这两个函数的用法,能帮我讲一下你给我发的那一段代码吗?还有,我把那段代码加到我的文件里去,但编译时提示error C2088: '*' : illegal for union和 error C2088: '-' : illegal for union 两个错误.不清楚该怎么改啊?请多帮忙!多谢多谢!!!

明显的语法错误，把出错的几行贴出来

void Delay(ULONG xMs)
{
LARGE_INTEGER llStart ;
LARGE_INTEGER llEnd ;
LARGE_INTEGER llFreq ;

llFreq = llFreq*xMs/1000 ;
KeQueryPerformanceCounter(&llFreq )
KeQuerySystemTime(&llStart) ;
do
KeQuerySystemTime(&llEnd) ;
while((llEnd-llStart)<llFreq) ;
}
KeQueryPerformance和KeQuerySystemTime这两个函数你用过吗?我看搞太懂怎么用这两个函数控制时间,请多多指点!先谢过了!出错的两行是llFreq = llFreq*xMs/1000 和while((llEnd-llStart)<llFreq) ;



[编辑 -  8/1/04 by  zsh_7769]

这样

void Delay(ULONG xMs)
{
LARGE_INTEGER llStart ;
LARGE_INTEGER llEnd ;
LARGE_INTEGER llFreq ;

KeQueryPerformanceCounter(&llFreq ) ;
llFreq.QuadPart = llFreq.QuadPart*xMs/1000 ;
KeQuerySystemTime(&llStart) ;
do
KeQuerySystemTime(&llEnd) ;
while((llEnd.QuadPart-llStart.QuadPart)<llFreq.QuadPart) ;
}

上次哪个随手写的，没有测试，不好意思给添麻烦了。




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回答的好请给分

你看哪个do  while循环
通过它控制看时间是不是过了给定的值



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回答的好请给分

看一看LARGE_INTEGER结构的定义
typedef union _LARGE_INTEGER {
  struct {
      DWORD LowPart;
      LONG  HighPart;
  };
  LONGLONG QuadPart;
} LARGE_INTEGER, *PLARGE_INTEGER;

明显得语法错误，需要引用其成员,如 llFreq.QuadPart，说明如下：

The LARGE_INTEGER structure is actually a union. If your compiler has built-in support for 64-bit integers, use the QuadPart member to store the 64-bit integer. Otherwise, use the LowPart and HighPart members to store the 64-bit integer.

[编辑 -  8/3/04 by  snowStart]

多谢AllenZh和snowStart的帮助!给分啦,接住!虽然不多!请别介意.