我一直在调试一个很难发现我的错误的代码。我已经声明和数组喜欢
char* Cdiff[320];
然而,当在 Xcode 5.0.1 中运行应用程序时,它在代码的其他部分崩溃(根据我的说法)与该数组没有任何关系。
我正在使用的代码示例是
...
...
//patchSize = 4, blockSize = 10
uchar *Cdiff = new uchar[(patchSize*patchSize)*2 * blockSize];
// FOR EACH BLOCK OF PATCHES (there are 'blockSize' patches in one block)
for (uint iBlock = 0; iBlock < nBlocks; iBlock++)
{
// FOR EACH PATCH IN THE BLOCK
for(uint iPatch = iBlock*blockSize; iPatch < (iBlock*blockSize)+blockSize; iPatch++)
{
// GET THE POSITION OF THE upper-left CORNER(row, col) AND
// STORE THE COORDINATES OF THE PIXELS INSIDE THE CURRENT PATCH (only the current patch)
uint iPatchV = (iPatch*patchStep)/camRef->getWidth();
uint iPatchH = (iPatch*patchStep)%camRef->getWidth();
for (uint pRow = iPatchV, pdRow = 0; pRow < iPatchV+patchSize; pRow++, pdRow++)
{
for (uint pCol = iPatchH, pdCol = 0; pCol < iPatchH+patchSize; pCol++, pdCol++)
{
patchPos.push_back(Pixel(pCol, pRow));
}
}
// GET THE RIGHT AND DOWN NEIGHBORS TO COMPUTE THE DIFFERENCES
uint offset = 0;
for (Pixel p : patchPos)
{
uint r = p.getY();
uint c = p.getX();
uchar pixelV = ((uchar*)camRef->getData())[r*imageW+c];
uint cRightNeighbor = c+patchStep;
uchar pixelVrightP = 0;
if (cRightNeighbor < imageW)
{
pixelVrightP = abs(pixelV - ((uchar*)camRef->getData())[r*imageW+cRightNeighbor]);
}
uint rDownNeighbor = r+patchStep;
uchar pixelVbelowP = 0;
if (rDownNeighbor < imageH)
{
pixelVbelowP = abs(pixelV - ((uchar*)camRef->getData())[rDownNeighbor*imageW+c]);
}
//---This is the right way to compute the index.
int checking = (iPatch%blockSize)*(patchSize*patchSize)*2 + offset;
//---This lines should throw a seg_fault but they don't
Cdiff[iPatch*(patchSize*patchSize)*2 + offset] = pixelVrightP;
Cdiff[iPatch*(patchSize*patchSize)*2 + offset+(patchSize*patchSize)] = pixelVbelowP;
offset++;
}
...
...
}
}
我忘记blockSize
在索引的计算中使用,所以在块的每次迭代中,它从第 0 个位置开始写入。
谁能解释我如何/为什么没有正确报告 Xcode 这些类型的 seg_faults?实际上,我必须测试我的代码并在 linux 上对其进行调试,以便能够捕获该错误。Xcode 中是否有类似于 Valgrid 的工具可以帮助我调试?