VC编程，对文件里的指定字符串进行替换

[KELLERMANCHEN]

求高手帮我写个例子。自己写了一些还没弄通。 只要是能够对某一文本文件的指定字符串进行替换就行。 谢谢！

void rule01::OnCheck2()
{
CFile file;
CString str；
file.Open("D:\\PROJECT\\PROGRAM\\defrule.clp",CFile::modeReadWrite);
file.ReadHuge(str,100);
str=str.Replace("pipe-soil-AC","8");
file.SetLength(0);
file.Write(str,100);
file.Close();
}

[zhoujianhei]

CString strBang(_T("Everybody likes field hockey"));
int n = strBang.Replace(_T("field hockey"), _T("soccer"));
_ASSERT(n == 1);

[快乐鹦鹉]

代码不是挺好的吗？
有啥问题？
file.Write(str,100);
改成file.Write(str,str.GetLength());更好

[zhoujianhei]

void rule01::OnCheck2()   
{   
CFile file;   
char buf[101];

file.Open("D:\\PROJECT\\PROGRAM\\defrule.clp",CFile::modeReadWrite);   
UINT len = file.Read(buf,100);  
buf[len] = '\0';

CString str(buf)；  
str.Replace("pipe-soil-AC","8");   

file.SeekToBegin();
file.Write(str,100);   
file.Close();   
}

[快乐鹦鹉]

file.ReadHuge(str,100);
改成file.ReadHuge(str.GetBuffer(100),100);
str.ReleaseBuffer();

[duyanbin_sy]

CFile file;
CString str;
TCHAR c[1024]={0}; //可以先计算文件尺寸,再根据尺寸用new的方式申请内存
file.Open("D:\\PROJECT\\PROGRAM\\defrule.clp",CFile::modeReadWrite);
file.Read(c,1024);
str.Format("%s",c);
str.Replace("pipe-soil-AC","8");
file.SetLength(0);
file.Write(str,str.GetLength());
file.Close();

[KELLERMANCHEN]

有点问题，期待解决。。 根据如下代码
CFile file;
char buf[101];

file.Open("D:\\PROJECT\\PROGRAM\\defrule.clp",CFile::modeReadWrite);
UINT len = file.Read(buf,100);
buf[len] = '\0';
CString str=buf;
//CString str(buf)；
str=str.Replace("pipe-soil-AC","8");

file.SeekToBegin();
file.Write(str,100);
file.Close();

文件内容由
(defrule result001
(< pipe-soil-AC 6)
(soil acidic)
=>
(open "zzz.txt" zzz "w")
(printout zzz "交流干扰程度较弱")
(close zzz)
)

变成了
efrule result001
(< 8 6)
(soil acidic)
=>
(open "zzz.txt" zzz "w")
(printout z printout zzz "交流干扰程度较弱")
(close zzz)
)