怎样删除一个文本文件中的若干空行？

Question

偶是这样写的：
while( InFile.ReadString(str) )
{
if( str != "" )
{
OutFile.WriteString(str);
OutFile.WriteString("\n");
}
}
没有达到效果，一行也没有删除，请教大虾

Answer 1

或许对str进行Trim一下比较好。
ReadString每次读入一行？

Answer 2

CString str;
while( InFile.ReadString(&str) )
{
         str.TrimLeft()
if( str.GetLength() != 0)
{
OutFile.WriteString(str.GetBuffer(str.GetLength()));
OutFile.WriteString("\n\r");
}
}

Answer 3

while(pAfile->ReadString(str))
{
str.TrimLeft();
str.TrimRight();
if(str!="")
{
pBfile->WriteString(str); 
pBfile->WriteString("\r\n");
}
}

Answer 4

有点问题，修改
while(pAfile->ReadString(str))
{        
                           CString temp;
                           temp =str;
temp.TrimLeft();
temp.TrimRight();
if(temp!="")
{
pBfile->WriteString(str); 
pBfile->WriteString("\r\n");
}
}