MFC文件操作学习笔记

<span style="white-space:pre">	</span>FILE *pFile;<span style="white-space:pre">	</span>fopen_s(&pFile, "1.txt", "w");// TODO: 在此添加命令处理程序代码<span style="white-space:pre">	</span>fwrite("try best", 1, strlen("try best"), pFile);<span style="white-space:pre">	</span>fflush(pFile);<span style="white-space:pre">	</span>//fclose(pFile);

void CFileTestView::OnFileRead(){<span style="white-space:pre">	</span>FILE *pFile;<span style="white-space:pre">	</span>//TCHAR<span style="white-space:pre">		</span><span style="white-space:pre">	</span>fopen_s(&pFile, "1.txt", "r");// TODO: 在此添加命令处理程序代码<span style="white-space:pre">	</span>fseek(pFile, 0, SEEK_END);//移动文件指针到结尾处<span style="white-space:pre">	</span>int file_len = ftell(pFile);             //获得文件指针的位置<span style="white-space:pre">	</span>char *Read_buffer;<span style="white-space:pre">	</span>Read_buffer = new char[file_len + 1];//加1 最后一位置0<span style="white-space:pre">	</span>//memset(Read_buffer, 0, 100); //<span style="white-space:pre">	</span>Read_buffer[file_len] = 0;<span style="white-space:pre">	</span>rewind(pFile);<span style="white-space:pre">	</span>//fseek(pFile, 0, SEEK_SET);<span style="white-space:pre">	</span>fread(Read_buffer, 1, file_len , pFile);<span style="white-space:pre">	</span><span style="white-space:pre">	</span>fclose(pFile);}

文件缓冲系统。使得文件不能立即更新内容。可以使用fflushfseek设置写入位置写入数据时使用offstream类ofstream ofs("4.txt");ofs.write("china dota best dota", strlen("china dota best dota"));ofs.close();需要添加<fstream.h> 并使用命名空间 using namespace std;读取数据时使用ifstream类ifstream ifs("4.txt");char buffer[100];memset(buffer, 0, 100);ifs.read(buffer, 100);ifs.close();句柄方式：HANDLE hFile;DWORD Bytes;hFile = CreateFile(_T("5.txt"), GENERIC_WRITE, 0, NULL, CREATE_NEW, FILE_ATTRIBUTE_NORMAL, NULL);WriteFile(hFile, "China Dota Best Dota", strlen("China Dota Best Dota"), &Bytes, NULL);CloseHandle(hFile);CFile方式：CFile cFile(_T("6.txt"),CFile::modeWrite | CFile::modeCreate);cFile.Write("NewBee Dota is ti6 Champion", strlen("NewBee Dota is ti6 Champion"));cFile.Close();

<span style="white-space:pre">	</span>CFile cFile(_T("6.txt"), CFile::modeRead);<span style="white-space:pre">	</span>char buffer[100];<span style="white-space:pre">	</span>memset(buffer, 0, 100);<span style="white-space:pre">	</span>cFile.Read(buffer, 30);<span style="white-space:pre">	</span>cFile.Close();

CFileDialogCFileDialog cFileDlg(FALSE); //另存为 TRUE为打开//cFileDlg.m_ofn.lpstrFileTitle = _T("我的文件保存对话框");cFileDlg.m_ofn.lpstrFilter = _T("TextFile(*.txt)\0*.txt\0AllFile(*.*)\0*.*\0\0");cFileDlg.m_ofn.lpstrDefExt = _T("txt");if(IDOK == cFileDlg.DoModal()){CString filename = cFileDlg.GetFileName();CFile cFile(filename, CFile::modeWrite | CFile::modeCreate);cFile.Write("NewBee Dota is ti6 Champion", strlen("NewBee Dota is ti6 Champion"));cFile.Close();}<span style="white-space:pre"> </span>CFileDialog cFileDlg(TRUE);  //另存为  TRUE为打开<span style="white-space:pre"> </span>  //cFileDlg.m_ofn.lpstrFileTitle = _T("我的文件保存对话框");<span style="white-space:pre"> </span>cFileDlg.m_ofn.lpstrFilter = _T("TextFile(*.txt)\0*.txt\0AllFile(*.*)\0*.*\0\0");<span style="white-space:pre"> </span>//cFileDlg.m_ofn.lpstrDefExt = _T("txt");<span style="white-space:pre"> </span>if (IDOK == cFileDlg.DoModal())<span style="white-space:pre"> </span>{<span style="white-space:pre"> </span>CString filename = cFileDlg.GetFileName();<span style="white-space:pre"> </span>CFile cFile(filename, CFile::modeRead);<span style="white-space:pre"> </span>char buffer[100];<span style="white-space:pre"> </span>memset(buffer, 0, 100);<span style="white-space:pre"> </span>cFile.Read(buffer, 30);<span style="white-space:pre"> </span>cFile.Close();<span style="white-space:pre"> </span>}