打开文件失败 [英] File Failure On Open

问题描述

为了教育目的，我正在编写一个小型加密程序（不是真正的加密）。我重组了程序，所以我的代码主要是为了简化自己的事情。

for educational purposes, I am writing a small encryption program (not real encryption). I've restructured the program so all my code is in main to simplify things for myself.

我的加密文件失败。我不知道为什么这是我迄今为止所知道的。

My unEncrypted file fails. I don't know why. Here's what I know so far.

1. 使用Xcode


2. 通过切换文件被打开（并测试）以仅验证未加密的文件失败：它是


3. 没有建立阶段>>复制文件>>添加文件，将这两个文件添加到绝对路径


4. 我已经检查了文件的拼写和我的代码


5. 更改了订单，但仍然未加密的文件失败


6. 清除任何可能偶然发生的旗帜


7. 重写文件的读/写位置

1. Using Xcode
2. Tested statements by switching the order which the files are opened (and tested) to verify only the unencrypted file failing: it is
3. Gone to Build Phases >> Copy Files >> Add File, adding both files to Absolute Path
4. I've checked the spelling of the files and my code
5. Changed the order again for good measure, still the unencrypted file fails
6. Cleared any flags which may accidentally be there
7. Rewound the read/write positions of the files

这是我的代码全部。

//  This program reads the contents of a file, encrypts it, and write the contents into a separate file.


#include <iostream>
#include <fstream>
#include <cctype>
#include <cstring>
#include <cmath>

using namespace std;

// Global Constants
const int POSITIVE_INT_LIMIT = 10;
const int NEGATIVE_INT_LIMIT = -10;
const int SLOPE_NEGATIVE = -1;
const int SLOPE_POSITIVE = 1;
const int STEP = 1;

int main() {

    int amplitude = 0, slope = SLOPE_NEGATIVE; //Set initial amplitude and slope.

    int streamSize = 1;

    char ch, cy;
    char *chPtr = &cy; // Initialize and assign char pointer.

    //open an unencrypted file to read from
    fstream unEncryptedFile;
    unEncryptedFile.open("testA", ios::in | ios::binary);

    //open a file to write encrypted info
    fstream cryptFile;
    cryptFile.open("testB", ios::out | ios::binary);

    //Clear flags previous set, just in case
    unEncryptedFile.clear();
    cryptFile.clear();

    //Rewind the files, just in case
    unEncryptedFile.seekg(0L, ios::beg);
    cryptFile.seekp(0L, ios::beg);

    if (unEncryptedFile.fail()) {
        cout << "Error opening read file." << endl;
        exit(1);
    }

    if (cryptFile.fail()) {
        cout << "Error opening write file." << endl;
        exit(1);
    }



    /*      Encryption pattern inside while-loop.

     limit>     10                             *
                9                             * *
                8                            *   *
                7                           *     *
                6                          *       * 
                5                         *         *
                4                        *           *
                3                       *             *
                2                      *               *
                1                     *                 *
     start>     0*2345678901234567890*2345678901234567890* -- < one hertz (cycle)
               -1 *                 *
               -2  *               *   (Number line: each integer represents a single while-loop cycle.)
               -3   *             *
               -4    *           *
               -5     *         *
               -6      *       *
               -7       *     *
               -8        *   *
               -9         * *
     limit>    -10         *

     */
    /*************************************************************
     The pattern above depictes a single character
     being read, and then the value of amplitude is added to it.

     *************************************************************/

    while (!unEncryptedFile.fail()) {

        ch = unEncryptedFile.get(); // Get the next character in the file.

        cout << ch << endl; // test for proper read

        if (amplitude > NEGATIVE_INT_LIMIT && slope == SLOPE_NEGATIVE) {
            amplitude -= STEP;
            cy = ch + amplitude;
            cryptFile.write(chPtr, streamSize); //Adjusted character value, cy, is written to file.

        } else if (amplitude <= NEGATIVE_INT_LIMIT){
            slope = SLOPE_POSITIVE;
            amplitude = NEGATIVE_INT_LIMIT;
            cy = ch + amplitude;
            cryptFile.write(chPtr, streamSize); //Adjusted character value, cy, is written to file.

        } else if (amplitude < POSITIVE_INT_LIMIT && SLOPE_POSITIVE){
            amplitude += STEP;
            cy = ch + amplitude;
            cryptFile.write(chPtr, streamSize); //Adjusted character value, cy, is written to file.

        } else if (amplitude >= POSITIVE_INT_LIMIT){
            slope = SLOPE_NEGATIVE;
            amplitude = POSITIVE_INT_LIMIT;
            cy = ch + amplitude;
            cryptFile.write(chPtr, streamSize); //Adjusted character value, cy, is written to file.
        }

    }

    //Files are closed.
    unEncryptedFile.close();
    cryptFile.close();



    return 0;
}

推荐答案

您需要提供文件扩展名与打开文件时的文件名

you need to provide the file extension with the file name while opening a file

int main() {

    int amplitude = 0, slope = SLOPE_NEGATIVE; //Set initial amplitude and slope.

    int streamSize = 1;

    char ch, cy;
    char *chPtr = &cy; // Initialize and assign char pointer.

    //open an unencrypted file to read from
    fstream unEncryptedFile;

    unEncryptedFile.open("testA.txt", ios::in | ios::binary);

我尝试过你的代码，它的工作。

I tried your code with this and it's working.

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