帮我看看这是用的什么原理?

Question

本帖最后由 VisualEleven 于 2011-07-04 09:48:44 编辑

Answer 1

求教还有RegQueryValueEx函数在这起到什么作用

Answer 2

PERF_OBJECT_TYPE *FirstObject(PERF_DATA_BLOCK *dataBlock) {   return (PERF_OBJECT_TYPE *) ((BYTE *)dataBlock + dataBlock->HeaderLength); }   PERF_OBJECT_TYPE *NextObject(PERF_OBJECT_TYPE *act) {   return (PERF_OBJECT_TYPE *) ((BYTE *)act + act->TotalByteLength); }   PERF_COUNTER_DEFINITION *FirstCounter(PERF_OBJECT_TYPE *perfObject) {   return (PERF_COUNTER_DEFINITION *) ((BYTE *) perfObject + perfObject->HeaderLength); }   PERF_COUNTER_DEFINITION *NextCounter(PERF_COUNTER_DEFINITION *perfCounter) {   return (PERF_COUNTER_DEFINITION *) ((BYTE *) perfCounter + perfCounter->ByteLength); }   PERF_COUNTER_BLOCK *GetCounterBlock(PERF_INSTANCE_DEFINITION *pInstance) {   return (PERF_COUNTER_BLOCK *) ((BYTE *)pInstance + pInstance->ByteLength); }   PERF_INSTANCE_DEFINITION *FirstInstance (PERF_OBJECT_TYPE *pObject) {   return (PERF_INSTANCE_DEFINITION *)  ((BYTE *) pObject + pObject->DefinitionLength); }   PERF_INSTANCE_DEFINITION *NextInstance (PERF_INSTANCE_DEFINITION *pInstance) {   PERF_COUNTER_BLOCK  *pCtrBlk = GetCounterBlock(pInstance);     return (PERF_INSTANCE_DEFINITION *) ((BYTE *)pInstance + pInstance->ByteLength + pCtrBlk->ByteLength); }   char *WideToMulti(wchar_t *source, char *dest, int size) {   WideCharToMultiByte(CP_ACP, 0, source, -1, dest, size, 0, 0);     return dest; }
这一段代码是什么意思   有什么作用呀   

Answer 3

PERF_OBJECT_TYPE *FirstObject(PERF_DATA_BLOCK *dataBlock) 
{ 
  return (PERF_OBJECT_TYPE *) ((BYTE *)dataBlock + dataBlock->HeaderLength); 
} 
  PERF_OBJECT_TYPE *NextObject(PERF_OBJECT_TYPE *act) 
{  
 return (PERF_OBJECT_TYPE *) ((BYTE *)act + act->TotalByteLength);
 }  
 PERF_COUNTER_DEFINITION *FirstCounter(PERF_OBJECT_TYPE *perfObject) 
{ 
  return (PERF_COUNTER_DEFINITION *) ((BYTE *) perfObject +perfObject>HeaderLength);
}  
 PERF_COUNTER_DEFINITION *NextCounter(PERF_COUNTER_DEFINITION *perfCounter) 
{  
 return (PERF_COUNTER_DEFINITION *) ((BYTE *) perfCounter + perfCounter->ByteLength);
 } 
  PERF_COUNTER_BLOCK *GetCounterBlock(PERF_INSTANCE_DEFINITION *pInstance)
 { 
  return (PERF_COUNTER_BLOCK *) ((BYTE *)pInstance + pInstance->ByteLength); 
} 
  PERF_INSTANCE_DEFINITION *FirstInstance (PERF_OBJECT_TYPE *pObject)
 {  
 return (PERF_INSTANCE_DEFINITION *)  ((BYTE *) pObject + pObject->DefinitionLength); 
}   
PERF_INSTANCE_DEFINITION *NextInstance (PERF_INSTANCE_DEFINITION *pInstance)
 {  
 PERF_COUNTER_BLOCK  *pCtrBlk = GetCounterBlock(pInstance);     return (PERF_INSTANCE_DEFINITION *) ((BYTE *)pInstance + pInstance->ByteLength + pCtrBlk->ByteLength);
 } 
  char *WideToMulti(wchar_t *source, char *dest, int size)
 {  
 WideCharToMultiByte(CP_ACP, 0, source, -1, dest, size, 0, 0);    
 return dest; 
} 
  这一段是从上面复制的代码 就是想知道这段代码的作用