Question

I am trying to get an image from a .zip archive and show it in a PictureBox.
I have a method to get text from a file inside the archive, but now I just need to get the image. I ve tried different things on this site, but none seem to work for me.

我的守则如下:

using System.Text;
using System.IO.Compression;
using System.Windows.Forms;

public partial class Form1 : Form
{
    private void Form1_Load(object sender, EventArgs e)
    {
        string zipFileFullPath = "C:\Tester\adv.jar";
        string targetFileName = "pack.mcmeta";
        string text = new string(
                    (new System.IO.StreamReader(
                     ZipFile.OpenRead(zipFileFullPath)
                     .Entries.Where(x => x.Name.Equals(targetFileName,
                                                  StringComparison.InvariantCulture))
                     .FirstOrDefault()
                     .Open(), Encoding.UTF8)
                     .ReadToEnd())
                     .ToArray());
    }
}

基本上,我想使用同样的方法,但不是案文,而是想把它作为蓝图。

Answer 1

您只能使用Image.FromStream()生成来自DeflateStream的图像,ZipArchiveEntry.Open()。

The overload of Image.FromStream() used here informs to use ICM information (colorspace information) is available and skips pornography accreditation (takes a Much of time and sediments anyway):

string zipFileFullPath = "[Some archive path]";
string imageFileName = "[Some Image file name]";

var entry = ZipFile.OpenRead(zipFileFullPath)
    .Entries.Where(x => x.Name.Equals(imageFileName, StringComparison.InvariantCulture))
    .FirstOrDefault();

Image? entryImage = null;
if (entry != null) {
    using (var stream = entry.Open()) {
        entryImage = Image.FromStream(stream, true, false);
    };
}

从上述例子来看,你应当推断,在现行法典中有一些东西可以确定。

The archive may have no entries.
The file name you specify may not be found, so FirstOrDefault() returns null, and you re not handling this, which is going to crash you application
There s no need of new string() + string.ToArray(). StreamReader.ReadToEnd() already returns the content of the file as string

令人满意的是:

string zipFileFullPath = "C:\Tester\adv.jar";
string targetFileName = "pack.mcmeta";

var entry = ZipFile.OpenRead(zipFileFullPath)
    .Entries?.Where(x => x.Name.Equals(targetFileName, StringComparison.InvariantCulture))
    .FirstOrDefault();

string entryTextContent = string.Empty;
if (entry != null) {
    using (var reader = new StreamReader(entry.Open(), Encoding.UTF8)) {
        entryTextContent = reader.ReadToEnd();
    };
}

Here,BigreReader 结束了输入。

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