C++/CLI loading an image from resx

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I've searched high and low, but for some reason I can't find a tutorial for loading an image (or in fact any resource) from a resx file in C++/CLI.

I have my project's soultion set up like this:

MyProject
-HeaderFiles
--Form1.h
---Form1.resx (not using this, as VS likes to automatically remove stuff from it)
-Resource Files
--Image1.png
--Image2.png
--Resources.resx

The Resources.resx file also contains the images.

Any ideas?

Posted 26-Apr-11 22:55pm

Paul Cardy

Updated 26-Apr-11 22:58pm

v2

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2 solutions

Solution 1

I tried to set the BackgroundImage property of a form with a PNG image (the PNG image was stored in the Form1.resX file), and the designer added these lines in the InitializeComponent method:

C++

void InitializeComponent(void)
{
    System::ComponentModel::ComponentResourceManager^  resources = (gcnew
        System::ComponentModel::ComponentResourceManager(Form1::typeid));
    this->SuspendLayout();
    // 
    // Form1
    // 
    ...
    this->BackgroundImage = (cli::safe_cast<system::drawing::image^>(resources->GetObject(L"$this.BackgroundImage")));
    ...
}

So I suppose you can use ComponentResourceManager class and GetObject method with the appropriate name.

Posted 27-Apr-11 0:09am

Olivier Levrey

Comments

Paul Cardy 27-Apr-11 6:53am

Thanks. Yeah, I noticed this too, but I can't put the resource in Form1's resx as the designer automatically clears it when adding/removing it's resources and the ComponentResourceManager only seems to allow a type as a constructor (Which it then uses to make a string description), rather than me explicitly telling my resources string description. See my solution for how I eventually solved this.

Olivier Levrey 27-Apr-11 7:20am

Ok it is good you found it by yourself.
Cheers.

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Paul Cardy · Accepted Answer · 2011-04-27T00:44:00

Typically, after posting I found a solution myself (by searching for C++.net instead of c++/cli). For completeness it was:

C++/CLI

using namespace System;

Reflection::Assembly^ pxAssembly = Reflection::Assembly::GetExecutingAssembly();
String^ pxResName = pxAssembly->GetName()->Name + ".Resources"; //Note: add your resourcefile name here, i.e. ".MyResourceFile" as it appears in solution explorer, without it's extension
s_pxResourceManager = (gcnew Resources::ResourceManager(pxResName,pxAssembly));

pictureBox1->Image = (cli::safe_cast<Drawing::Bitmap^>(s_pxResourceManager->GetObject("my_png_image"))) //note: this is the exact name from the resx, not the filename or name in solution explorer. By default it's name in the resx won't contain it's extension.