在函数中反复使用CString会造成Stack溢出,求解？

2019-05-05 06:58:06 230 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

C++ ＜cstring＞深度解析：内存模型、安全陷阱与现代替代方案在C/C++编程中，字符串和内存操作是基础且核心的技术概念。其底层原理基于连续内存块和空字符（\0）终结符的模型，程序员需手动管理内存边界。这种直接操作内存的方式带来了极高的性能潜力，尤其在对执行效率有极致要求的系统编程、嵌入式开发和高频交易等应用场景中至关重要。然而，这也引入了缓冲区溢出和内存越界等严重安全风险。本文聚焦于 `string>` 库，深入剖析 `strcpy`、`strncpy` 等函数的内存陷阱与安全实践，并探讨如何与 `std::string` 等现代C++工具协同，以实现安全高效的阅读详情

源码如下，求大神帮忙看看，为什么总是出现0xC00000FD: Stack overflow



CFile fParseTxtFile;

if(!fParseTxtFile.Open(szFileName,CFile::modeRead))	{

AfxMessageBox(_T("文件打开失败!"));

return;

}



int nDotSize = 0;

char szReadLine[1024] = {0};

arryData.RemoveAll();



        int nReadByteSize = fParseTxtFile.Read(szReadLine,1024);

CString szLinetxt;

szLinetxt = CString(szReadLine,nReadByteSize);

DWORD	dwLoadValue;

unsigned char *pDotsPtr = (unsigned char*)&dwLoadValue;

unsigned char readChar = 0;

unsigned char indexDot = 0;



while(!szLinetxt.IsEmpty())	{



CString szHexInfo;



USES_CONVERSION;



while(szLinetxt.GetLength() >= 2)	{



if(byteCount == 0x1BE0)	{

nCount = 61;

}

szHexInfo = szLinetxt.SpanIncluding(CString("0123456789ABCDEFabcdef"));	



if(szHexInfo.IsEmpty())	{

if(szLinetxt.GetLength() >= 2)	{

szLinetxt = szLinetxt.Mid(1);

continue;

}

}else if(szHexInfo.GetLength() < 2)	{

break;

}else if(szHexInfo.GetLength() == 2)	{

readChar = _strtoi64(T2A(szHexInfo),NULL,16);	

if(indexDot == 0)	{

*pDotsPtr = readChar;	

}else if(indexDot == 1)	{

*(pDotsPtr+1) = readChar;

}else if(indexDot == 2)	{

*(pDotsPtr+2) = readChar;

if(readChar & 0x80)	{

*(pDotsPtr+3) = 0xFF;

}else{

*(pDotsPtr+3) = 0x00;

}

}



indexDot = indexDot + 1;



if(indexDot == 3)	{

arryData.Add(dwLoadValue);

byteCount++;

indexDot = 0;

}



szLinetxt = szLinetxt.Mid(szHexInfo.GetLength()+1);	



}else{

int nHexBytesSize = szHexInfo.GetLength();

int nRemoveBytes = 0;



while(szHexInfo.GetLength() >= 2)	{



CString sznewHexinfo = szHexInfo.Left(2);

readChar  =  _wtoi(sznewHexinfo);



if(indexDot == 0)	{	

*pDotsPtr = readChar;	

}else if(indexDot == 1)	{

*(pDotsPtr+1) = readChar;

}else if(indexDot == 2)	{

*(pDotsPtr+2) = readChar;

if(readChar & 0x80)	

*(pDotsPtr+3) = 0xFF;

else	

*(pDotsPtr+3) = 0x00;	

}



indexDot = indexDot + 1;



if(indexDot == 3)	{

arryData.Add(dwLoadValue);

indexDot = 0;

}



szHexInfo = szHexInfo.Mid(2);

nRemoveBytes += 2;

}



if(szLinetxt.GetLength() > nHexBytesSize)	{

szLinetxt =  szLinetxt.Mid(nHexBytesSize + 1);	

}else{

szLinetxt =  szLinetxt.Mid(nRemoveBytes);	

}	

}	

}



nReadByteSize = fParseTxtFile.Read(szReadLine,1024);	



if(nReadByteSize == 0)	{

break;

}

szLinetxt = szLinetxt + CString(szReadLine,nReadByteSize);

}





fParseTxtFile.Close();