读取位置 0x00000000 时发生访问冲突

lippl 2012-08-04 03:45:21

大家好，我的这段代码总是会有读取位置 0x00000000 时发生访问冲突，请帮助查查～非常感谢
代码如下



UCHAR* pBufOut = new UCHAR[width];

UCHAR* pBufWin = NULL;

UCHAR** pBufBands = NULL;

UCHAR** pBufWin2D = NULL;

UCHAR*** pBufBands3D = NULL;

for (int j=0; j<height;j++)

{

    for (int i=0; i<width;i++)

    {

       nWinSize = nWinSizeDefault;

	do 

	{

           //此处可能会有新的nWinSize的值，且根据i，j的不同而不同

           //if（nWinSizeOk）break；

	} while (1);



	HalfWindow = nWinSize/2;



        pBufBands = new UCHAR*[nBand];

	for (int n=0;n<nBand;n++)

	{

		pBufBands[n] = new UCHAR[nWinSize*nWinSize];      

	}



	for (int n=0;n<nBand;n++)

	{

		CGEO_RasterData* pRaster = m_pImage_->GetRasterData(n);

		//对pBufBands[n]赋值

                Get_Mask_Buf(pRaster,rect.left+i,rect.top+j,nWinSize,pBufBands[n]);

	}

       

       //根据nWinSize 和 nBand 建立 一个二维数组和三维数组

       pBufWin2D = new UCHAR*[nWinSize];

	for (int n1=0;n1<nWinSize;n1++)

	{

		pBufWin2D[n1]=new UCHAR[nWinSize];

		//memset(pBufWin2D[n1],0,nWinSize*sizeof(UCHAR));

	}



	pBufBands3D= new UCHAR**[nWinSize];

	for (int n1=0;n1<nWinSize;n1++)

	{

		pBufBands3D[n1]=new UCHAR*[nWinSize];

		for (int n2=0;n2<nWinSize;n2++)

		{

			pBufBands3D[n1][n2]=new UCHAR[nBand];

		}

	}

        //由pBufBands和pBufWin 给pBufBands3D和pBufWin2D 赋值

        for (int ii=0; ii<nWinSize; ii++)

	{

	     for (int jj=0; jj<nWinSize; jj++)

	     {

		int ID = pBufWin[ii*nWinSize+jj];

		pBufWin2D[ii][jj] = ID;

		for (int b =0;b<nBand;b++)

		{

			int val = pBufBands[b][ii*width + jj];

			pBufBands3D[ii][jj][b] = val; 

		}

	    }

	}

        

       //将pBufBands3D和pBufWin2D输入函数计算

       pBufOut[i] = adjust_mindist_classifier(nWinSize,pBufBands3D,pBufWin2D,dSpaWeight);



       //释放内存

       //free pBufWin and pBufBands

	delete[] pBufWin;

	pBufWin =NULL;

	for (int n=0; n<nBand; n++)

	{

		delete []pBufBands[n];

	}

	delete []pBufBands;

	pBufBands =NULL;



        //free pBufWin2D and pBufBands3D

	for (int n=0; n<nWinSize; n++){

	    delete []pBufWin2D[n];

	}

	delete []pBufWin2D;

			

	for(int i = 0; i < nWinSize; ++i){

	    for(int j = 0; j < nWinSize; ++j)

		delete [] (pBufBands3D[i][j]);

	delete []pBufBands3D[i];

	}

	delete [] pBufBands3D;



	pBufWin2D =NULL;

	pBufBands3D =NULL;

      }

}

该段代码在debug下可以不定地运行数次循环，但在循环中会有
有未经处理的异常: 0x00000000:

其最后调用堆栈位置在：
pBufBands3D[n1][n2]=new UCHAR[nBand]; 这个函数处

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localxiao 2012-08-04

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[Quote=引用 4 楼的回复:]

一般来说，new之后判断是否成功，使用前判断指针是否为NULL，释放后将指针置为NULL任何时间都不会出错，当然是单线程，如果是多线程就要加锁。
[/Quote]

new失败是抛出std::bad_alloc异常。不会返回NULL

IVERS0N 2012-08-04

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[Quote=引用 7 楼的回复:]

应该是

C/C++ code

//由pBufBands和pBufWin 给pBufBands3D和pBufWin2D 赋值
for (int ii=0; ii<nWinSize; ii++)
{
for (int jj=0; jj<nWinSize; jj++)
{
int ID = pBufW……
[/Quote]

单步调试下应该是越界了

lippl 2012-08-04

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应该是



        //由pBufBands和pBufWin 给pBufBands3D和pBufWin2D 赋值

        for (int ii=0; ii<nWinSize; ii++)

    {

         for (int jj=0; jj<nWinSize; jj++)

         {

        int ID = pBufWin[ii*nWinSize+jj];

        pBufWin2D[ii][jj] = ID;

        for (int b =0;b<nBand;b++)

        {

            int val = pBufBands[b][ii*width + jj];

            pBufBands3D[ii][jj][b] = val; 

        }

        }

    }