关于vector.end()非法访问
本帖最后由 C812414776 于 2013-03-14 11:08:15 编辑 typedef std::vector<int> ivChainCode;
typedef std::vector<POINT> pvLineTable;

bool ToLineTable(POINT ptStart, ivChainCode ChainCode, pvLineTable *pLineTable)
{
ivChainCode::iterator i, j;
POINT ptCurrent = { 0, 0 };
const POINT ptOffset[8] =
{
{ 1, 0 }, { 1, 1 }, { 0, 1 }, { -1, 1 },
{ -1, 0 }, { -1, -1 }, { 0, -1 }, { 1, -1 }
};
int nTable[8][8] =
{
{ 0, 2, 2, 2, 2, 0, 0, 0 },
{ 0, 2, 2, 2, 2, 3, 0, 0 },
{ 0, 2, 2, 2, 2, 3, 3, 0 },
{ 0, 2, 2, 2, 2, 3, 3, 3 },
{ 1, 0, 0, 0, 0, 1, 1, 1 },
{ 1, 3, 0, 0, 0, 1, 1, 1 },
{ 1, 3, 3, 0, 0, 1, 1, 1 },
{ 1, 3, 3, 3, 0, 1, 1, 1 }
};
// 清空线段表
//pLineTable->erase(pLineTable->begin(), pLineTable->end());
pLineTable->clear();
cyl=1;
ptCurrent.x = ptStart.x;
ptCurrent.y = ptStart.y;
if (ChainCode.empty())
{
// 独立点
pLineTable->push_back(ptCurrent);
pLineTable->push_back(ptCurrent);
}
else
{
// 查表法转换
for (i = ChainCode.begin(), j = i + 1; i != ChainCode.end()-1; i++, j++)
{
if (j == ChainCode.end())
{
j = ChainCode.begin();
}

ptCurrent.x += ptOffset[*i].x;
ptCurrent.y += ptOffset[*i].y;
switch (nTable[*i][*j])
{
case 0:
break;
case 1:
case 2:
pLineTable->push_back(ptCurrent);
break;
case 3:
pLineTable->push_back(ptCurrent);
pLineTable->push_back(ptCurrent);
break;
}
}
// 排序
sort(pLineTable->begin(), pLineTable->end(), CPointCompare());
}
return true;
}

////////////////////////我的程序///////////////////////////////////////////
BOOL CFeatureAna::ChainToLine()
{
int cl_patternnum = patternnum;
int i,j;//循环变量
int Cnumber;
POINT Start;
pvLineTable *CLineTable;
POINT *Barycenter;
for (i=1; i < patternnum ; i++)//
{
Cnumber=m_pattern[i].index;
ivChainCode CC(m_pattern[i].ChainCode, m_pattern[i].ChainCode + Cnumber);
Start.x = m_pattern[i].TX;
Start.y = m_pattern[i].TY;

ToLineTable(Start,CC, CLineTable);
}
return TRUE;
}
其中m_pattern[i].ChainCode是一个数组，大小是m_pattern[i].index
ToLineTable是CSDN上找的程序，运行到clear（），pLineTable->end()，ChainCode->end()都是非法访问,在MFC里运行，是我定义还是初始化出问题了？ vector iterator
[解决办法]
第7行这个CLineTable是野指针啊，直接访问不就完蛋了嘛

BOOL CFeatureAna::ChainToLine()
{
int cl_patternnum =  patternnum;
int i,j;//循环变量
int Cnumber;
POINT Start;
pvLineTable *CLineTable;
POINT *Barycenter;
for (i=1; i < patternnum ; i++)//
{
Cnumber=m_pattern[i].index;
ivChainCode CC(m_pattern[i].ChainCode, m_pattern[i].ChainCode + Cnumber); 
Start.x = m_pattern[i].TX;
Start.y = m_pattern[i].TY;

 ToLineTable(Start,CC, CLineTable);
}
return TRUE;
}