在函数中反复使用CString会造成Stack溢出,求解？

[cjfmail]

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();

[伊航]

介绍一下程序背景，思路。

[draculamx]

USES_CONVERSION，不要放到while循环中使用。。。

USES_CONVERSION它是在堆栈上分配空间的，也就是说你在你使用的函数未结束就不会被释放掉。所以要注意不要在一个函数中用while循环执行它，不然栈空间就马上会分配完（栈空间一般只有2M，很小）

[cjfmail]

感谢 draculamx给出正解，这个问题困扰我很久，今天终于一扫云雾。