如何查找替换二进制文件的特定字符串,看看我哪儿不对?谢谢了!

Question

if(file.Open(path_search,CFile::modeCreate|CFile::modeReadWrite|CFile::typeBinary)!=0)
       {
        CFile file1;
TCHAR *p;
        CString filename;
        filename=filestruct.name;
        p=strchr(filestruct.name,'.');
        filename=filename.Mid(0,strlen(filename)-strlen(p));
        CString endfilename;
        endfilename=dirname+filename;
       file.SeekToBegin();
       CString strFind    = "test.bmp";
       CString strReplace = endfilename+".bmp";
       CString strFind1   = "test.mid";
       CString strReplace1 = endfilename+".mid";
       AfxMessageBox(strReplace1);
       UINT nFindCount = 8;       //strFind的长度
       UINT nReplaceCount = 8;    //strReplace的长度
       char *strBuf = new char[nFindCount + 1];    
       memset(strBuf , 0 , nFindCount+1); 
      file1.Open(path1+"file1.tmp",CFile::modeCreate|CFile::modeReadWrite|CFile::typeBinary);//创建临时文件
       while(file.Read(strBuf , nFindCount))
      {
  
      strBuf[nFindCount] = '\0';
       if(!strcmp(strBuf , strFind))
   {
         memcpy(strBuf,strFind,nFindCount); 
   }
        if(!strcmp(strBuf , strFind1))
{
        memcpy(strBuf,strFind1,nFindCount); 
}
   file1.Write(strBuf,nFindCount);//将数据写回临时文件中
       memset(strBuf , 0 , nFindCount+1);
       file.Seek(1, CFile::begin);
   file1.Seek(1, CFile::begin);
       }
     if(CopyFile(file1,file,TRUE))//将原文件内容替换成临时文件内容,这儿如何操作啊?
       delete []strBuf;
       file.Close();
   file1.Close();
 
         }

Answer 1

if(!strcmp(strBuf , strFind))
{
         memcpy(strBuf,strFind,nFindCount); 
}
if(!strcmp(strBuf , strFind1))
{
        memcpy(strBuf,strFind1,nFindCount); 
}
这里是干什么的？如果strBuf==strFind就把strBuf替换为strFind?既然相同还换什么？
要退换文件可一把源文件删掉，把修改后的文件重命名就可以了

Answer 2

CString name1;
name1=path1+"tmp.tmp";
    if (!file1.Open(name1,CFile::modeWrite|CFile::modeCreate|CFile::typeBinary, &ex))
 {
         TCHAR szError[1024];
         ex.GetErrorMessage(szError, 1024);
     AfxMessageBox(szError);
 }
 
   if(file.Open(path_search,CFile::modeReadWrite|CFile::typeBinary)!=0)
       {
        
        TCHAR *p;
        CString filename;
        filename=filestruct.name;
        p=strchr(filestruct.name,'.');
        filename=filename.Mid(0,strlen(filename)-strlen(p));
        CString endfilename;
       endfilename=dirname+filename;
       file.SeekToBegin();
       CString strFind    = "test.bmp";
       CString strReplace = endfilename+".bmp";
       CString strFind1   = "test.mid";
       CString strReplace1 = endfilename+".mid";
       UINT nFindCount = 8;       //strFind的长度
       UINT nReplaceCount = 8;    //strReplace的长度
       char *strBuf = new char[nFindCount + 1];    
      memset(strBuf , 0 , nFindCount+1); 
      while(file.Read(strBuf,nFindCount))
       {
      strBuf[nFindCount] = '\0';
     if(!strcmp(strBuf,strFind))
      {
      memcpy(strBuf,strReplace,nFindCount+1); 
      file1.Write(strBuf,strReplace.GetLength());
  }
 else if(!strcmp(strBuf ,strFind1))
 {
 UINT filelen1=strReplace1.GetLength();
 TRACE("%d",filelen1);
 memcpy(strBuf,strReplace1,nFindCount+1); 
     file1.Write(strBuf,strReplace1.GetLength());
 }
 else
     file1.Write(strBuf,nFindCount+1);
     memset(strBuf,0,nFindCount+1); 
     file.Seek(1,CFile::begin); 
 file1.Seek(1,CFile::begin);       }
    
          delete []strBuf;
       
   DeleteFile(path_search);
       file1.Rename(name1,path_search);
   file1.Close();
       file.Close();