MFC-CFile类

VS2012

微软MFC帮助文档地址https://docs.microsoft.com/zh-cn/cpp/mfc/reference/cfile-class?view=msvc-160#getlength

1.控制台项目

#include <iostream>
#include <afx.h>

using namespace std;

int main()
{
    //CFile file("D:\File.txt",CFile::modeReadWrite);

    CFile file;//文件类
    CFileException e;//文件异常类
    //模式又读又写的去打开文件
    if (file.Open("D:\File.txt", CFile::modeReadWrite, &e))
    {
        cout << "成功" << endl;

        BYTE buffer[0x1000];
        DWORD dwBytesRemaining = file.GetLength();
        while (dwBytesRemaining)
        {
            memset(buffer, 0, 0x1000);
            UINT nBytesRead = file.Read(buffer, sizeof(buffer));
            dwBytesRemaining -= nBytesRead;
            cout << buffer << endl;
        }
        file.Close();

    }
    else
    {    
        if (e.m_cause == CFileException::fileNotFound)
        {
            cout << "失败：文件没找到" << endl;
        }
        //e.Delete();
    }

    cout << "Hello" << endl;

    getchar();
    return 0;
}

2.MFC项目

void CDemo2Dlg::OnBnClickedButton1()
{
    // TODO: 在此添加控件通知处理程序代码
    try
    {
        m_edit_text.Empty();

        CFile file("D:\File.txt", CFile::modeReadWrite);

        BYTE buffer[0x1000];
        DWORD dwBytesRemaining = file.GetLength();
        while (dwBytesRemaining)
        {
            memset(buffer, 0, 0x1000);
            UINT nBytesRead = file.Read(buffer, sizeof(buffer));
            dwBytesRemaining -= nBytesRead;

            m_edit_text.Append(CString(buffer));
        }
        file.Close();
        UpdateData(FALSE);
    }
    catch(CFileException* e)
    {
        e->ReportError();
        e->Delete();
    }
}

 Caesar卢尚宇

2021年1月12日