C ++免费错误，谁能帮帮我PLZ！ [英] C++ free error , who can help me plz!

问题描述

  if （bFullCourse）{
  long  AreaShopListNum =  0 ; 
 
  if （piAreaInfo-> SPKBN ==  0 ）
 AreaShopListNum = HMDetailNum  -   2 ; 
  else  
 AreaShopListNum = HMDetailNum  -   3 ; 
 
 AreaShopList_T * piAreaShopList =（AreaShopList_T *）malloc（ sizeof （AreaShopList_T）* AreaShopListNum）; 
 
  int  i =  0 ; 
 HMDetail_T * pHMDetail = pioHMDetail; 
 AreaShopList_T * pAreaShopList = piAreaShopList; 
  while （i <  HMDetailNum）{
  if （strcmp（piBaseInfo-> BaseCD，pHMDetail-> DlvCD）==  0 ）{
 i ++; 
 pHMDetail ++; 
 继续; 
} 
 strcpy_s（pAreaShopList-> HonNO，pHMDetail-> HonNO）; 
 strcpy_s（pAreaShopList-> ShopCD，pHMDetail-> DlvCD）; 
 
 i ++; 
 pHMDetail ++; 
 pAreaShopList ++; 
} 
 
  int  ret = TimeRoutingW（piBaseInfo，ShopInfoNum，piShopInfo， 1 ，piAreaInfo，AreaShopListNum，piAreaShopList，
 pioHMDetail，pszOutputFile， false ，bCvs，bWeekExchange）; 
 
< big> free（piAreaShopList）; < /   big  < span class =code-keyword>>   //  错误!!为什么？ 
 
  return  ret; 
} 
  else  {... 

解决方案

< blockquote>最有可能在分配大小后修改内存。首先尝试不使用while循环来检查我的理论。

  while （i<  HMDetailNum ）

  while （i< AreaShopListNum）
 

如果您学会使用调试器，它会有很多帮助也许添加一些断言。

在 free 之前，你将指针传递给另一个函数， TimeRoutingW - 也许该函数已经释放了它？



如果这没有帮助，请发布您收到的错误消息。它可能包含重要的线索。

if (bFullCourse) {
        long AreaShopListNum = 0;

        if (piAreaInfo->SPKBN == 0)
            AreaShopListNum = HMDetailNum - 2;
        else
            AreaShopListNum = HMDetailNum - 3;

        AreaShopList_T *piAreaShopList = (AreaShopList_T*)malloc(sizeof(AreaShopList_T) * AreaShopListNum);

        int i = 0;
        HMDetail_T* pHMDetail = pioHMDetail;
        AreaShopList_T *pAreaShopList = piAreaShopList;
        while (i < HMDetailNum) {
            if (strcmp(piBaseInfo->BaseCD, pHMDetail->DlvCD) == 0) {
                i++;
                pHMDetail++;
                continue;
            }
            strcpy_s(pAreaShopList->HonNO, pHMDetail->HonNO);
            strcpy_s(pAreaShopList->ShopCD, pHMDetail->DlvCD);

            i++;
            pHMDetail++;
            pAreaShopList++;
        }

        int ret = TimeRoutingW(piBaseInfo, ShopInfoNum, piShopInfo, 1, piAreaInfo, AreaShopListNum, piAreaShopList,
                                pioHMDetail, pszOutputFile, false, bCvs, bWeekExchange);

        <big>free(piAreaShopList);</big>    // error !! why?

        return ret;
    }
    else { ...

解决方案

most likely you modify the memory after the allocated size. Try it first without the while loop to check my theory.

while (i < HMDetailNum) 

while (i <  AreaShopListNum)

It will help lots if you learn to use the debugger and perhaps add some asserts.

Immediately before the free, you pass the pointer to another function, TimeRoutingW - maybe that function already frees it?

If that doesn't help, please post the error message that you get. It may contain important clues where to look.

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