User Breakpoint called from code at XXX 错误，麻烦各位大虾帮忙看一下

[medaka]

请各位大虾帮忙看一下，我的错误在哪儿呢？
在执行第二次WritePFile时候就出现了这个问题。谢谢啦！

我的代码
#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>

typedef struct
{
double X;
double Y;
double Z;
}Point;

typedef struct
{
int NumOfPoint;
Point *pPointList;
int Flag;
}Coord;

void WritePFile(Coord CoordList)
{
FILE* fp;
int i;
Point P[10];
for (i = 0; i < CoordList.NumOfPoint; i ++)
{
P[i] = CoordList.pPointList[i];
}
fp = fopen("File", "w");
fwrite(&CoordList.NumOfPoint, sizeof(int), 1, fp);
fwrite(CoordList.pPointList, sizeof(Point) * CoordList.NumOfPoint, 1, fp);
fwrite(&CoordList.Flag, sizeof(int), 1, fp);
fclose(fp);

if (CoordList.NumOfPoint > 0)
{
free(CoordList.pPointList);
CoordList.pPointList = NULL;
}

}

int ReadPFile(Coord *CoordList)
{
FILE* fp;
Point P[10];

if ((fp = fopen("File", "r")) == NULL)
{
return -1;
}
fread(&CoordList->NumOfPoint, sizeof(int), 1, fp);
fread(P, sizeof(P), 1, fp);
fread(&CoordList->Flag, sizeof(int), 1, fp);
fclose(fp);

if (CoordList->NumOfPoint != 0)
{
CoordList->pPointList = (Point *)malloc(sizeof(Point) * CoordList->NumOfPoint);
CoordList->pPointList = P;
}
return 1;

}
int main(int argc, char* argv[])
{
Coord CoordList;
CoordList.NumOfPoint = 1;
CoordList.pPointList = (Point *)malloc(sizeof(Point) * CoordList.NumOfPoint);
CoordList.pPointList[0].X = 1;
CoordList.pPointList[0].Y = 2;
CoordList.pPointList[0].Z = 3;
CoordList.Flag = 1;

WritePFile(CoordList);

ReadPFile(&CoordList);
CoordList.Flag = 2;
WritePFile(CoordList);

return 0;
}

[InwIvled]

int ReadPFile(Coord *CoordList) 
{ 
  FILE* fp; 
  Point P[10]; 

  if ((fp = fopen("File", "r")) == NULL) 
  { 
    return -1; 
  } 
  fread(&CoordList->NumOfPoint, sizeof(int), 1, fp); 
  fread(P, sizeof(P), 1, fp); 
  fread(&CoordList->Flag, sizeof(int), 1, fp); 
  fclose(fp); 

  if (CoordList->NumOfPoint != 0) 
  { 
    CoordList->pPointList = (Point *)malloc(sizeof(Point) * CoordList->NumOfPoint); 
    // 这里应该把P的内容拷贝到CoordList->pPointList指向的内存
    // 否则上面分配的内存将泄漏，而且CoordList->pPointList保存的是P的地址，出了这个函数
    // 就被释放了，到时候调用WritePFile时，最后释放内存会出错
    CoordList->pPointList = P; 
  } 
  return 1; 

}

[会的越多不会的也就越多]

顶

[medaka]

[Quote=引用 1 楼 inwivled 的回复:]
C/C++ codeint ReadPFile(Coord*CoordList)
{
FILE* fp;
Point P[10];if ((fp= fopen("File","r"))== NULL)
{return-1;
}
fread(&CoordList->NumOfPoint,sizeof(int),1, fp);
fread(P,sizeof(P),¡­
[/Quote]

多谢大哥！问题解决了！