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Forums » Prof-UIS Tech Support » Loading a PNG file. Collapse All
Subject Author Date
Krustys Donuts Jul 28, 2008 - 3:31 PM

Dear Product Support,

 

I am trying to load a PNG from a resource. The FindResourceHandle routine always returns hInst = 0. The code used to load the resource is as follows:

 

      CExtSkinBitmap _bmpTmp;

      HRSRC hRsrc = NULL;

      LPCTSTR strPngResourceSection = _T("PNG");

      HINSTANCE hInst = g_ResourceManager->FindResourceHandle( strPngResourceSection, IDB_pngJogJointSpace, NULL, &hRsrc );

      ASSERT( hInst );

      ASSERT( hRsrc );

      VERIFY( _bmpTmp.LoadPNG_Resource( hInst, hRsrc ) );

 

In the resource.h file there is:

 

#define IDB_pngJogJointSpace            411

 

In the Ziggy.rc file there is:

 

IDB_pngJogJointSpace    PNG                     "res\\JointSpace.png"

 

 

I have also included the PNG file.  Please tell me what I’m doing incorrectly.

 

Thanks,

 

Gil Ross
Technical Support Jul 30, 2008 - 4:03 AM

The PNG file is loaded successfully in the following simplest possible test project:

http://www.prof-uis.com/download/forums/TestPng.zip

It uses your PNG loading source code. So, the problem is hidden somewhere else. We suspect your project configures the resource manager in some special way so it cannot find the appropriate PNG resource
Jeremy Richards Jul 29, 2008 - 11:19 AM

Well, I recently tried doing this in a legacy Prof-UIS app.  Here is what I came up with:


bool CPngBitmap::LoadFromResource(UINT resID) {

    Empty();

    LPCTSTR strPngImageResourceID = MAKEINTRESOURCE( resID );

    LPCTSTR strPngResourceSection = _T("PNG");

    HINSTANCE hInst = ::AfxFindResourceHandle( strPngImageResourceID, strPngResourceSection );

    ASSERT( hInst );

    HRSRC hRsrc = ::FindResource( hInst, strPngImageResourceID, strPngResourceSection );

    ASSERT( hRsrc );



    bool retVal = LoadPNG_Resource( hInst, hRsrc );

    ASSERT(retVal);



    return retVal;



}


The only real difference that I can see is that I call ::AfxFindResourceHandle instead of using g_ResourceManager.  It seems clear we both copied the example code provided.


 


Mine works fine.  My resource is directly in the .exe itself, and not loaded by any DLLs.