VS2013+MFC编程程序可以运行，但是一个按钮的结果出错

// 2个容器来存放图像数据和对应的标签
vector<Mat> images;
vector<int> labels; //作为外部变量定义
void FaceRecognitionDlg::OnBnClickedRecognize()
{
    // TODO:  在此添加控件通知处理程序代码
    images.clear();
    labels.clear();
    pEdtConfidence->GetWindowText(strConfidence);

    try
    {
        dConfidence = atoi((const char *)strConfidence);
    }
    catch (cv::Exception &e)
    {
        MessageBox("置信度请输入整数！");
        return;
    }
    model->set("threshold", dConfidence);
    if (!read_img(images, labels))
    {
        AfxMessageBox("Error in reading images!");
        images.clear();
        labels.clear();
        return;
    }
    if (images.size() < 1)
    {
        MessageBox("This demo needs at least 1 images to work!");
        return;
    }
    //training
    model->train(images, labels);

    bool_detec_reco = true;
    bool_picNum = true;
}