How can I load PNG files from Resource? Topic is solved

[purplex88]

I am on Windows using MSVC++14.0 with wxWidgets 3.1.

What I am currently doing is loading PNG files from a path:

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wxBitmap BitmapSettings("D:\\Settings.png", wxBITMAP_TYPE_PNG);

And setting them on a wxButton and achieving transparency:

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m_settings->SetBitmap(BitmapSettings);

// For transparency
m_settings->SetBackgroundColour(GetBackgroundColour());

So, I want to load PNG from a resource instead of a path. As I recall some years ago we had no support for loading a png file from resource file. Is it possible to easily do this now?

[doublemax]

https://wiki.wxwidgets.org/Embedding_PN ... ource_file

[purplex88]

Hi, I tried:

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wxBitmap BitmapSettings(wxBITMAP_PNG("#107"));

Where "#107" is resource ID of PNG.

Is it the same way I load Icons i.e. wxIcon("#101") ?

[doublemax]

I've never used these macros. Try without the #.

[purplex88]

I think I tried everything but same error:

This is resource.h file

#define IDI_ICON1 102
#define IDB_PNG1 107
#define IDB_PNG2 108
#define IDB_PNG3 109

This is .rc file

// Icon with lowest ID value placed first to ensure application icon
// remains consistent on all systems.
IDI_ICON1 ICON "icon1.ico"

/////////////////////////////////////////////////////////////////////////////
//
// PNG
//

IDB_PNG1 PNG "Settings1.png"
IDB_PNG2 PNG "Settings2.png"
IDB_PNG3 PNG "Settings3.png"

So I tried the following:

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wxBitmap BitmapSettings(wxBITMAP_PNG("#107"));

or,

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wxBitmap BitmapSettings(wxBITMAP_PNG("107"));

or,

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wxBitmap BitmapSettings(wxBITMAP_PNG("Settings1.png"));

or,

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wxBitmap BitmapSettings(wxBITMAP_PNG("Settings1"));

or,

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wxBitmap BitmapSettings(wxBITMAP_PNG("IDB_PNG1"));

or,

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wxBitmap BitmapSettings(wxBITMAP_PNG(IDB_PNG1));

None of these work and I get this error:

error.png (5.88 KiB) Viewed 5024 times

Insanity.

[doublemax]

This worked for me:

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// .rc
SOMEPNG RCDATA "toucan.png"

// code
::wxInitAllImageHandlers();
wxBitmap bmp("SOMEPNG", wxBITMAP_TYPE_PNG_RESOURCE);

[purplex88]

Yes, I also changed "PNG" to "RCDATA":

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IDB_PNG1 RCDATA "Settings1.png"
IDB_PNG2 RCDATA "Settings2.png"
IDB_PNG3 RCDATA "Settings3.png"

and:

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wxInitAllImageHandlers();
wxBitmap BitmapSettings("IDB_PNG1", wxBITMAP_TYPE_PNG_RESOURCE);

I rebuilt the project and it still won't work and ends up with same error.

[purplex88]

Interestingly, it works only if I add the number ID with '#' with "RCDATA" string.

[PB]

Are you sure it is interesting and not by design, i.e., the difference between ordinal and string resource identifiers?

[purplex88]

I am not sure why the method specified by doublemax won't work. I just haven't seen any tutorial where they use # with number identifier from resource.h.

Edit: Okay, I figured that out as well. Doublemax's method will work if I delete the IDs from resource.h file.

[Asimov]

Hey I just got my icons to load from a resource file in Codeblocks using the same technique and I haven't even got a resource.h file.
I converted all my pngs to bin using Resource Hacker, saved them out and then just added the following lines to my resource.rc file.

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aaaa ICON "wx/msw/std.ico"

#include "wx/msw/wx.rc"

ARROW-DOWN RCDATA "rc/ARROW-DOWN.bin"

ARROW-UP RCDATA "rc/ARROW-UP.bin"

CREATE RCDATA "rc/CREATE.bin"

DELETE RCDATA "rc/DELETE.bin"

EDIT RCDATA "rc/EDIT.bin"

Now all I gotta do is work out how to load a font from the resource file LOL.

regards
Asimov