How to load image from a standard DLL win32 in C#?

Question

0.00/5 (No votes)

See more:

Hi everyone,
I have created a standard dll win32 file with some images by C++. Now I have to load a image (which is with ID) from this dll. I want to use a API function to load that image and after display it on my PictureBox control of Form. But I dont know to choose any function and use it. How do I do this? Hope you help me. Thanks.

What I have tried:

This is my code: I use

LoadBitmapA

function.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Resources;
using System.Runtime.InteropServices;

namespace ImageDLLTest
{
    public partial class Form1 : Form
    {
        [DllImport("user32.dll")]
        private static extern IntPtr LoadBitmapA(IntPtr hinst, int iD);
        [DllImport("kernel32.dll")]
        private static extern IntPtr LoadLibraryA(string Libb);
        [DllImport("kernel32.dll")]
        private static extern IntPtr FreeLibrary(IntPtr hinst);

        public Form1()
        {
            InitializeComponent();
            IntPtr getLib = LoadLibraryA("xy.dll");
            this.BackgroundImage = (System.Drawing.Image)LoadBitmapA(getLib, 1);
            IntPtr freeLib = FreeLibrary(hinst);

            //MessageBox.Show(getLib.ToString());
        }
    }
}

But not work!

Posted 8-Feb-17 5:31am

Andrewpeter

Updated 8-Feb-17 7:20am

v2

Add a Solution

Comments

[no name] 8-Feb-17 11:57am

" I want to use a API function to load", okay so read the documentation for whatever API you have chosen to use.

Andrewpeter 8-Feb-17 13:19pm

I use LoadBitmapA() to load image from dll, but it's not to work. I update my code above. Hope you help me!

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

KarstenK · Answer 1 · 2017-02-08T06:36:00

You must build some interface with some functionality.

The needed steps are:

1. fetch all needed information from the C++ image into the C# app
2. build a suitable byte buffer in C#
4. call C++ to fill the byte buffer with the image data
4. construct the bitmap

Then you can use this Bitmap constructor to build your bitmap.

To write an interface in your dll you can learn from my article Calling All Stations.

A hack would be that the dll writes a temporary bitmap file which loads C#.