C语言读写txt文件的问题

[C_arm]

写了一个用C语言读写文件的程序，发现关闭文件的时候报了一个堆栈溢出的错误，系统为windowsXP，编译器是VS2008，代码如下：

FILE* inputXrayPoints1;
int numPoints1;
double* xrayVideoPointsCorrespondence1;
int iterPoints;

double xrayPointX;
double xrayPointY;
double videoPointX;
double videoPointY;
int point3DX;
int point3DY;

inputXrayPoints1=fopen("testCase/pointsCorrespondence1.txt","r");
fscanf(inputXrayPoints1,"%d",&numPoints1);
//fprintf(stdout,"numPoints1:\t%d\n",numPoints1);
xrayVideoPointsCorrespondence1=(double*)malloc(6*numPoints1);
for(iterPoints=0;iterPoints<numPoints1;++iterPoints){
fscanf(inputXrayPoints1,"%lf%lf%lf%lf%d%d",&xrayPointX,&xrayPointY,&videoPointX,&videoPointY,&point3DX,&point3DY);
xrayVideoPointsCorrespondence1[6*iterPoints]=xrayPointX;
xrayVideoPointsCorrespondence1[6*iterPoints+1]=xrayPointY;
xrayVideoPointsCorrespondence1[6*iterPoints+2]=videoPointX;
xrayVideoPointsCorrespondence1[6*iterPoints+3]=videoPointY;
xrayVideoPointsCorrespondence1[6*iterPoints+4]=(double)point3DX;
xrayVideoPointsCorrespondence1[6*iterPoints+5]=(double)point3DY;
fprintf(stdout,"Point:\t%d\n%lf\t%lf\t%lf\t%lf\t%d\t%d\n",iterPoints,xrayPointX,xrayPointY,videoPointX,videoPointY,point3DX,point3DY);
}
fclose(inputXrayPoints1);

[小新小小新]

xrayVideoPointsCorrespondence1=(double*)malloc(6*numPoints1);

请问下这句的释放在哪里？

还有 numPoints有初始化么？

[W170532934]

加断点，单步调试。指针再使用之前必须有指向的内存区域。使用完成后记得释放

[C_arm]

[Quote=引用 1 楼 的回复:]

xrayVideoPointsCorrespondence1=(double*)malloc(6*numPoints1);

请问下这句的释放在哪里？

还有 numPoints有初始化么？
[/Quote]

初始化了
应改为
int numPoints1=0;

为什么要释放？那块内存我之后还要用
xrayVideoPointsCorrespondence1在底下的程序里还有用

[C_arm]

[Quote=引用 2 楼 的回复:]

加断点，单步调试。指针再使用之前必须有指向的内存区域。使用完成后记得释放
[/Quote]

为什么要释放？
要是我下边还要用呢？

[C_arm]

问题解决
xrayVideoPointsCorrespondence1=(double*)malloc(6*numPoints1);

应改为

xrayVideoPointsCorrespondence1=(double*)malloc(6*numPoints1*sizeof(double));

多谢楼里的两位，分数各给一半