Question

以下是相关代码：

void store::Hidden_Extract_Package(store::IPackage& _P, std::vector<store::IPackage> &_vector_of_extracted, std::string &_return_msg) {
    // get data from .txt and .jpg, put on heap, update pointers to point to this data
    std::vector<std::string> *text_ptr = new std::vector<std::string>(20); // allocate memory on heap for text data
    cv::Mat* image_ptr = new cv::Mat;
    _P.SetTextDataPtr(text_ptr);
    _P.SetImageDataPtr(image_ptr);


    // contains adress of a vector that stores each text line in a string
    // text file is limited to 20 lines

    for (const auto &entry : std::filesystem::directory_iterator(_P.GetParentPath())) { // find all children: will contain .txt and .jpg dir
        std::filesystem::path child_path = entry.path();
        std::string extension = (child_path.extension()).string(); // is this jpg or txt file?

        if (extension == ".txt") {
        ...
        }

        if (extension == ".jpg") {
            std::string path_name = entry.path().string();
            _return_msg = path_name;

            if (!path_name.empty()) {

                *image_ptr = cv::imread(path_name, 0); // read in grayscale
            /* exception thrown:
            Debug Assertion Failed!

            Program: ...\source\repos\StorageEngine\_build\x64\Release\StorageGUI.exe
            File: minkernel\crts\ucrt\src\appcrt\stdio\fopen.cpp
            Line: 30

             Expression: file_name != nullptr

            For information on how your program can cause an assertion failure, see the Visual C++ documentation on asserts.

            weird thing is that the path_name is valid
            */
            }

，然后通过库/接口使用此功能的GUI：

store::Extract_Package(selected_package, m_vector_of_extracted, test);
... (displaying text, this works fine)

 // display image
    // use QGraphicsView: needs QGraphicsScene, needs QGraphicsPixmapItem that needs QImage
    cv::Mat raw_image = *(m_vector_of_packages[table_row].GetImageDataPtr());
    //// opencv uses a diffrent format than QImage so will have to transform:
    //QImage image = QImage(raw_image.data, raw_image.cols, raw_image.rows, QImage::Format_Mono);
    //QPixmap pixmap = QPixmap::fromImage(image, Qt::AutoColor); // something doesnt work yet...

    //pixmap = pixmap.scaled(ui.labelImage->width(), ui.labelImage->height());
    //ui.labelImage->setPixmap(pixmap);

我想我早就开始工作了，然后没有引发异常，但是图像仍然不会显示，但是我丢失了这段代码。我一直在寻找一段时间，但我不知道如何解决。

用opencv加载图像会引发“调试断言失败！”

0 个答案: