c++ - 为什么我的 C++ 字符数组提前终止？

Question

下面的代码应该读取测试字符串然后打开文件并通过读取前 8 个字符在文本文件(包含多行)中找到相似的字符串以确保代码在正确的行上然后读取接下来的 4 个可能不同的字符每次。

代码对前 8 个字符工作正常，但它从不读取最后 4 个字符

void test_value2()
{
    char charRead;
    unsigned char test2String[65] = "12345f67895f";
    unsigned char comparetest2String[65] = { 0 };
    unsigned int counter1 = 0, countChars = 0, countTestChars = 0, countChars2 = 0;
    std::fstream testResultsFile;
    testResultsFile.open("C:\\Tan\\test.txt", ios::in);
    do
    {
        counter1++; //count number of chars in test2String
    } while (test2String[counter1] != '\0');
    cout << "number of chars in test2String " << counter1 << endl;

    if (!testResultsFile)
    {
        cout << "File not found " << endl;
        cout << "Press ENTER to EXIT " << endl;
        getchar();
        exit(0);
    }
    else
    {
        while (!testResultsFile.eof())
        {
            testResultsFile.get(charRead);  // Read char from the file
            countChars++;                   // count total character read for future comparison with countTestChars
            if (countTestChars == 8)
            {
                countChars2 = countChars;
                countTestChars++;
            }
            if ((charRead == test2String[countTestChars]) && (countTestChars < 9))
            {
                comparetest2String[countTestChars] = charRead;
                countTestChars++;
            }
            if ((countTestChars > 8) && (countTestChars < counter1)) // if at least first 8 chars matched, keep reading string
            {
                cout << "trying to read again" << endl;
                comparetest2String[countTestChars] = charRead;
                countTestChars++;
                if (countTestChars == counter1)
                {
                    cout << "done " << endl;
                    cout << comparetest2String << endl;
                    break;
                }
            }
        }
    }
}

Answer 1

逻辑错误在以下 block :

if (countTestChars == counter1)
{
   cout << "done " << endl;
   cout << comparetest2String << endl;

   // This line here causes the code to break 
   // out of the while loop after 8 characters are read.
   break;
}

更新

进一步检查代码，问题似乎出在以下 block 中。

     if (countTestChars == 8)
     {
        countChars2 = countChars;

        // This line is the culprit. You end up skipping an index.
        // Since comparetest2String is zero initialized, you don't
        // rest of comparetest2String when you print it.
        countTestChars++;
     }

删除上面的行可以解决问题。

请参阅 http://ideone.com/b6ebWu 处的工作代码.