程序运行时崩溃

Question

我一直在用 C++ 开发一个大学项目，基本上是一个使用 OpenCV 的 28x28 像素图像的数字识别器。你可能知道 MNIST 数据集，是的，我想使用它。好吧，我遇到了一个问题。 下面我附上了我的代码片段。该代码对于少量数据行来说工作得很好，但是当我使用实际数据集时，它会意外崩溃。它不提供输出，即匹配百分比，而是直接退出。它甚至没有完成执行。

void compareCSV(const string& csvPath1, const string& csvPath2)
{
    double totalMatchPercentage = 0.0;
    int dataCount = 0;
    int rowCount = 0;
    try
    {
        ifstream rowcount(csvPath1);
        string row;
        while (getline(rowcount, row)) {
            ++rowCount;
        }
        cout << "Existing rows: " << rowCount << endl;
        rowcount.close();
        // Open the CSV file for reading
        ifstream tempFile(csvPath2);
        // Check if the CSV file is successfully opened
        if (!tempFile.is_open())
        {
            throw runtime_error("Error opening CSV file: " + csvPath2);
        }
        string temp;
        getline(tempFile, temp);
        stringstream ss1(temp);
        vector<int> tempValues;
        int value1;
        while (ss1 >> value1)
        {
            tempValues.push_back(value1);
            if (ss1.peek() == ',')
            {
                ss1.ignore();
            }
        }
        cout << "Read values from temp file: ";
        for (int val1 : tempValues)
        {
            cout << val1 << " ";
        }
        cout << endl;
        // Check if the values vector has the expected size
        if (tempValues.size() < 784)
        {
            cerr << "Error: Unexpected number of values in line." << endl;
        }
        for (int j = 0; j < tempValues.size(); ++j)
        {
            newImage.at<uchar>(1, j) = static_cast<uchar>(tempValues[j]);
        }
        tempFile.close();
        ifstream dataFile(csvPath1);
        if (!dataFile.is_open())
        {
            throw runtime_error("Error opening CSV file: " + csvPath1);
        }
        string line;
        while (getline(dataFile, line)) {
            //cout << "Starting to read Data on row " << dataCount + 1 << endl;

            // Parse the line and fill the binary image matrix

            stringstream ss2(line);
            vector<int> dataValues;
            int value2;
            while (ss2 >> value2)
            {
                dataValues.push_back(value2);
                if (ss2.peek() == ',')
                {
                    ss2.ignore();
                }
            }
            /*cout << "Read values from line: ";
            for (int val2 : dataValues)
            {
                cout << val2 << " ";
            }
            cout << endl;*/
            // Check if the values vector has the expected size
            if (dataValues.size() < 784)
            {
                cerr << "Error: Unexpected number of values in line." << endl;
            }
            for (int j = 0; j < dataValues.size(); ++j)
            {
                existingImage.at<uchar>(1, j) = static_cast<uchar>(dataValues[j]);
            }
            // Parse the line and fill the binary image matrix
        // Compare 'binNewImage' with 'binImage' and accumulate the match percentage
            double matchPercentage;
            matchPercentage = PercentCalc(newImage, existingImage);
            //cout << "Match Percentage for Dataset " << dataCount + 1 << ": " << matchPercentage << "%" << endl;
            totalMatchPercentage += matchPercentage;

            ++dataCount;
        }
            // Close the CSV file
            dataFile.close();
            double percent = (dataCount > 0) ? (totalMatchPercentage / dataCount) : 0.0;
            cout << "Match Percentage = " << percent << " %" << endl;
    }
    catch (const exception& e) {
        cerr << "Exception: " << e.what() << endl;
    }
}

double PercentCalc(const Mat& newBinaryImage, const Mat& existingBinaryImage) {
    // Calculate the match percentage
    if (newBinaryImage.size() == existingBinaryImage.size() &&
        newBinaryImage.type() == existingBinaryImage.type()) {
        Mat diff;
        double totalcount = 0;
        double excount = 0;
        double newcount = 0;
        for (int j = 0; j < 784; j++) {
            if (newBinaryImage.at<uchar>(1, j) == 0 && existingBinaryImage.at<uchar>(1, j) == 0) {
                totalcount++;
            }
            if (existingBinaryImage.at<uchar>(1, j) == 0) {
                excount++;
            }
            if (newBinaryImage.at<uchar>(1, j) == 0) {
                newcount++;
            }
        }
        //cout << "total-count = " << totalcount << endl;
        //cout << "ex-count = " << excount << endl;
        //cout << "new-count = " << newcount << endl;
        return (static_cast<double>(totalcount) / static_cast<double>(excount)) * 100;
    }
    else
        return 0.0; // Return 0 if dimensions or type mismatch
}

int main() {
    img.compareCSV("data.csv","data1.csv");
    system("pause");
}

我希望程序能够顺利运行并给我一个输出而不是崩溃。我尝试取消对 cout 语句的注释，有时它有效，有时它会崩溃。

Answer 1

感谢大家的宝贵见解，尤其是理查德。我找出了问题所在，但不完全确定原因，但程序不再崩溃。我得到了我需要的输出。 干杯！！