CODEWITHSUNDEEP
c#winformsexport
user12169343
user12169343

Reputation:

C# extract an embedded resource from assembly to a specific location in pc?

How can I with button click export a file (file types: .jpg, .txt, .dll, ... etc) from my application resource code to a specific location on my computer (for example: C: \ drive) I tried this code with button click: Main Code:

Stream stream = Assembly.GetExecutingAssembly().GetManifestResourceStream("ApplicationName.Files.name.dll");
        FileStream fileStream = new FileStream("name.dll", FileMode.CreateNew);
        for (int i = 0; i < stream.Length; i++)
            fileStream.WriteByte((byte)stream.ReadByte());
        fileStream.Close();

But the application stoped and show me this error: Error Message:

System.NullReferenceException: 'Object reference not set to an instance of an object.'

stream was null.

More Informations:

1) I upload a .dll file to my resources.

2) I changed from this file Build Action to = "Embedded Resource".

I tried with Clint's help below. Images of my project now:

enter image description here

enter image description here

enter image description here

Upvotes: 1

Views: 2043

Answers (1)

Clint
Clint

Reputation: 6509

Scenario I (Your Scenario)

  • You have a project that has an embedded resource like (images,txt,etc)
  • You want to extract this file from your assembly and transfer it to another location

Scenario II

  • You have Class Library project (dll) that has an embedded resource like (images,txt, etc)
  • You load this dll in your main project and want to access the resources (image) in your dll

Usage

enter image description here

Important: Before using the Code

  • packages.config is an EmbeddedResource (Substitute it with the resource you are using)

  • Namespace of my project is ConsoleApp (Substitute it with your namespace)


Main 

   static void Main(string[] args)
   {

        ResourceManager.GetResourceInfo("packages.config");
        if (ResourceManager.resourceExists == false)
            return;

        //Loads packages.config in Bin/Debug
           ResourceManager.LoadResource("packages.config");

    }


ResourceManager.cs

    class ResourceManager
    {
      public static bool resourceExists { get; set; } = false;
      private static Stream resourceStream { get; set; }
      public static void GetResourceInfo(string fileNameWithExtension)
      {

          //Substitut this with your Project Name
        //Class Library Name AssistantLib >  Resources > AssistantLib.dll 
        const string pathToResource = "ConsoleApp.Folder1.Folder2";
        //The Dll that you want to Load
        var assembly = Assembly.GetExecutingAssembly();
        //var names = assembly.GetManifestResourceNames();
        var stream = assembly.GetManifestResourceStream($"{pathToResource}.{fileNameWithExtension}");
        if (stream == null)
            return;

        resourceExists = true;

        resourceStream = stream;

       }

      public static void LoadResource(string newFileNameWithExtension)
      {
        if(File.Exists(newFileNameWithExtension))
        {
            Console.WriteLine("File already exists");
            return;
        }
        using (Stream s = File.Create(newFileNameWithExtension))
        {
            Console.WriteLine("Loading file");
            resourceStream.CopyTo(s);
        }
      }
    }

Output

Package.Config in output folder

enter image description here

Upvotes: 2

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