Question

我正在创建一个工具，用于从文件中读取信息，并且还显示从所述文件中提取的图像。它读取信息就好了，但是当涉及到显示图像时，它会冻结程序而不会出错。该计划变得没有反应。调试器没有说什么，除了一段时间之后它会说线程已经退出但仍然没有来自程序的响应。

我需要重命名一些东西，因为我不想遇到麻烦

这是我用来提取和显示图像的代码：

try
        {
            global.meta.filetype = STFSRead.readString_C(0, 4);
            textBox2.Text = global.meta.filetype;
            textBox3.Text = STFSRead.detectType(global.meta.contype.ToString("X4"));
            textBox4.Text = global.meta.metaversion.ToString();
            textBox5.Text = global.meta.id1;
            textBox6.Text = global.meta.version.ToString("X");
            textBox7.Text = global.meta.version2.ToString("X");
            textBox8.Text = global.meta.id2;
            textBox9.Text = global.meta.id3;
            textBox10.Text = global.meta.id4;
            textBox11.Text = global.meta.id5;
            textBox12.Text = global.meta.displayname;
            textBox13.Text = global.meta.titlename;
            textBox14.Text = STFSRead.detectSomeInfo(global.meta.aflag.ToString("X2"));
            pictureBox1.Image = STFSRead.loadImage();
        }
        catch
        {
            throw new Exception("What did you do?\n All this is suppose to do is read a file, how did you screw that up?");
        }

public static Image loadImage()
    {
        Exception failed = new Exception("LoadImage failed. Contact a developer");
        string path = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData) + "/appname/cache/";
        string imgname = global.meta.id.Replace(" ", "") + ".png";
        if (Directory.Exists(@path))
        {
            if (File.Exists(@path + imgname))
            {
                using (Image img = Image.FromFile(@path + imgname))
                {
                    return img;
                }
                throw failed;
            }
            else if (!File.Exists(@path + imgname))
            {
                if (extractData(imgname, 0x171A, 0x4000))
                {
                    using (Image img = Image.FromFile(@path + imgname))
                    {
                        return img;
                    }
                    throw failed;
                }
                else
                    throw failed;
            }
            else
                throw failed;
        }
        else if(!Directory.Exists(@path)){
            Directory.CreateDirectory(@path);
            if (File.Exists(@path + imgname))
            {
                using (Image img = Image.FromFile(@path + imgname))
                {
                    return img;
                }
                throw failed;
            }
            else if (!File.Exists(@path+imgname))
            {
                if (extractData(imgname, 0x171A, 0x4000))
                {
                    using (Image img = Image.FromFile(@path + imgname))
                    {
                        return img;
                    }
                    throw failed;
                }
                else
                    throw failed;
            }
            else
                throw failed;
        }
        else
            throw failed;
    }

public static bool extractData(string filename, long startpos, long length)
    {
        string data = STFSRead.readString_A(startpos, length);
        string path = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData)+"/appname/cache/";
        if (Directory.Exists(@path))
        {
            using (StreamWriter file = new StreamWriter(@path + filename))
            {
                file.Write(data);
                file.Close();
            }
        }
        else if (!Directory.Exists(@path))
        {
            Directory.CreateDirectory(@path);
            using (StreamWriter file = new StreamWriter(@path + filename))
            {
                file.Write(data);
                file.Close();
            }
        }
        if (File.Exists(@path + filename))
            return true;
        else
            throw new Exception("Couldn't extract file "+filename+" at location "+startpos+" with a length of "+length);
    }

public static string readString_A(long startpos, long length)
    {
        string s = "";
        for (long i = startpos; i < startpos + length; i = i++)
        {
            global.fs.Position = i;
            byte[] buf = new byte[1];
            global.fs.Read(buf, 0, 1);
            if (buf[0] == 0x00) // Null symbol
            {
            }
            else
            {
                char c = Convert.ToChar(buf[0]);
                s += c;
           }
        }
        if (s == "" || s == " ")
        {
            s = "";
        }
        return s;
    }

我已经检查了我的appdata文件夹，当创建目录时，图像没有被创建，因此我认为它在提取过程中失败了。并且我的例外都没有被触发

编辑：关于异常......我在程序开始搞砸时添加了所有这些异常，看它是否会触发它们并缩小错误可能的位置。我不希望它处理这些例外。可能不是最好的方法，但我仍在学习c＃所以我不认为它是最好的方式。如果有更好的方法，请告诉我。

Answer 1

我认为你的问题在这里：

for (long i = startpos; i < startpos + length; i = i++)

应该是：

for (long i = startpos; i < startpos + length; i++)

i=i++实际上并没有增加变量

您可以在此处找到原因：i = i++ doesn't increment i. Why?。感谢@RenniePet的链接。

加载图像时，c＃应用程序无响应

1 个答案: