CFile

 

char *buf = (char *)malloc(sizeof(char) * 11);  
unsigned int offset;  
offset = 0;  
CString path = "d:\\1.txt";  
CFile data;  
CFileException mExcept;  
 
data.Open(path, CFile::typeBinary | CFile::modeRead, &mExcept);   
cout << data.GetLength() << endl << endl;  
data.Seek(offset, CFile::begin);  
data.Read(buf, 10);  
data.Close();  
buf[10] = 0;  
cout << buf << endl; 
 
data.Open(path, CFile::modeWrite | CFile::modeCreate);
 char *writeBuffer;
 writeBuffer = (char *)malloc(10);
 writeBuffer[0] = 'a';
 writeBuffer[1] = 'b';
 writeBuffer[2] = 'c';
 writeBuffer[3] = 'd';
 writeBuffer[4] = 0;
 writeBuffer[5] = 'e';
 data.Write(writeBuffer, 10);
 data.Close();