WriteFile與ReadFile實例(實用)

不多說，上代碼:

struct NPC{
    char sex;
    int age;
    double Blood;
};
//通過WriteFile寫入數據
void CWriteFileDlg::OnBnClickedButton1()
{
    HANDLE hFile = CreateFile(_T("F:\\123.txt"), GENERIC_WRITE, FILE_SHARE_READ,NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL,NULL);
    if (hFile== INVALID_HANDLE_VALUE) {
        MessageBox(_T("出錯啦"));
        return;
    }
    //定義各種數據
    int number = 55567;
    NPC mk;
    mk.sex = 'm';
    mk.age = 18;
    mk.Blood = 100.00;
    char szchar[20] = "你好！世界!!!";
    DWORD iWrite = 0;
    //寫入各種數據
    BOOL rRet = WriteFile(hFile, &number, sizeof(number), &iWrite, NULL);
    rRet = WriteFile(hFile, &mk, sizeof(mk), &iWrite, NULL);
    rRet = WriteFile(hFile, szchar, sizeof(szchar), &iWrite, NULL);
    if (rRet) {
        MessageBox(_T("成功!"));
    }
    else {
        MessageBox(_T("WriteFile失敗!"));
    }
    CloseHandle(hFile);
    return;
}

//使用ReadFile讀取數據
void CWriteFileDlg::OnBnClickedButton2()
{
    HANDLE hFile = CreateFile(_T("F:\\123.txt"), GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    if (hFile == INVALID_HANDLE_VALUE) {
        MessageBox(_T("出錯啦"));
        return;
    }
    //定義接收數據的變量
    int number = 0;
    NPC read = {0};
    char szStr[20] = "";
    DWORD iWritten = 0;
    CString retStr;
    //讀取數字
    BOOL iRet = ReadFile(hFile, &number, sizeof(number), &iWritten, NULL);
    if (iRet) {
        MessageBox(_T("讀取成功"));
        retStr.Format(_T("%d"), number);
        MessageBox(retStr);
    }
    else {
        MessageBox(_T("讀取失敗!"));
    }
    //讀取結構體
    iRet = ReadFile(hFile, &read, sizeof(read), &iWritten, NULL);
    if (iRet) {
        MessageBox(_T("讀取成功"));
    }
    else {
        MessageBox(_T("讀取失敗!"));
    }
    //讀取字符串
    iRet = ReadFile(hFile, szStr, sizeof(szStr), &iWritten, NULL);
    if (iRet) {
        MessageBox(_T("讀取成功"));
        
    }
    else {
        MessageBox(_T("讀取失敗!"));
    }
    CloseHandle(hFile);
}