AddImageFromString() in C++ DLL Project (RESOLVED)

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   Thank you for your reply today, it helped!
Unfortunately, I remained my own worst enemy.  After the the RCDATA update, I was getting the data and length right, but it wasn't working.

After dinner I came back and took a look at the actual call to AddImageFromString() that I was making.  Turns out I wasn't getting all the data stuffed into the std::string I thought I was.  I only got the first chunk of bytes up to the first NULL.

Builidng my input parameter with this helped: std::string test( res_data, res_size );

So....Here's the working code block for anybody else that might stroll by:

      int result = 0;
      HINSTANCE Instance = AfxGetInstanceHandle();
      HRSRC res = FindResource( Instance,MAKEINTRESOURCE( IDB_BINARY ), RT_RCDATA );
      if( res )
      {
         HGLOBAL res_handle = LoadResource( Instance , res );
         if( res_handle )
         {
            char *res_data = (char *) LockResource( res_handle );
            if( res_data )
            {
               DWORD res_size = SizeofResource( Instance, res );
               if( res_size )
               {
                  std::string test( res_data, res_size );
                  result = m_PdfWriter->AddImageFromString( test, 0 );
                  m_PdfWriter->SelectImage( result );
                  m_PdfWriter->DrawImage( 550, 5, 60, 60 );
               } // got the length
            } // locked it..i.e. got pointer to 1st byte
         } // loaded the resource
      } // found the resource item

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barqyDev Members Profile Find Members Posts Beginner Joined: 10 Feb 12 Status: Offline Points: 7	Post Options Post Reply Quote barqyDev Report Post Thanks(0) Quote Reply Topic: AddImageFromString() in C++ DLL Project (RESOLVED) Posted: 11 Feb 12 at 8:03AM
	Thank you for your reply today, it helped! Unfortunately, I remained my own worst enemy. After the the RCDATA update, I was getting the data and length right, but it wasn't working. After dinner I came back and took a look at the actual call to AddImageFromString() that I was making. Turns out I wasn't getting all the data stuffed into the std::string I thought I was. I only got the first chunk of bytes up to the first NULL. Builidng my input parameter with this helped: std::string test( res_data, res_size ); So....Here's the working code block for anybody else that might stroll by: int result = 0; HINSTANCE Instance = AfxGetInstanceHandle(); HRSRC res = FindResource( Instance,MAKEINTRESOURCE( IDB_BINARY ), RT_RCDATA ); if( res ) { HGLOBAL res_handle = LoadResource( Instance , res ); if( res_handle ) { char res_data = (char ) LockResource( res_handle ); if( res_data ) { DWORD res_size = SizeofResource( Instance, res ); if( res_size ) { std::string test( res_data, res_size ); result = m_PdfWriter->AddImageFromString( test, 0 ); m_PdfWriter->SelectImage( result ); m_PdfWriter->DrawImage( 550, 5, 60, 60 ); } // got the length } // locked it..i.e. got pointer to 1st byte } // loaded the resource } // found the resource item

AndrewC Members Profile Find Members Posts Moderator Group Joined: 08 Dec 10 Location: Geelong, Aust Status: Offline Points: 841	Post Options Post Reply Quote AndrewC Report Post Thanks(0) Quote Reply Posted: 11 Feb 12 at 2:13AM
	AddImage from file expects a full BMP, JPG, PNG or TIFF file. It sounds like you are on the right track extracting the JPEG resource. Here is a post that gives some hope. The last reply indicates that it might work better when the JPG is marked as RCDATA in the resource file. http://www.sfml-dev.org/forum/viewtopic.php?p=33890&sid=ba955874d6e717c8b858ede78a74c029

barqyDev Members Profile Find Members Posts Beginner Joined: 10 Feb 12 Status: Offline Points: 7	Post Options Post Reply Quote barqyDev Report Post Thanks(0) Quote Reply Posted: 10 Feb 12 at 10:24PM
	Another update....loaded a JPG from disk into a PDF file: CImage image; image.LoadFromResource( AfxGetInstanceHandle(), MAKEINTRESOURCE(IDR_LOGO) ); image.Save( L"test.jpg" ); index = pdf.AddImageFromFile( L"test.jpg", 0 ); pdf.SelectImage( index ); pdf.DrawImage( 0, 0, 100, 100 ); // all that above works // now, let's what data got stuffed into the PDF index = pdf.GetPageImageList(0); std::string Grab = pdf.GetImageListItemDataToString( index, 1, 0 ); // and it looks like the exact same content as what's in my JPG file on disk. Assuming I have that right, I'm now chunking through some more API calls: FindResource LoadResource LockResource SizeofResource Hopefully I'm on the right track.

barqyDev Members Profile Find Members Posts Beginner Joined: 10 Feb 12 Status: Offline Points: 7	Post Options Post Reply Quote barqyDev Report Post Thanks(0) Quote Reply Posted: 10 Feb 12 at 9:19PM
	I do have a working project using AddImageFromFile() it just makes me unhappy for the reasons mentioned.

barqyDev Members Profile Find Members Posts Beginner Joined: 10 Feb 12 Status: Offline Points: 7	Post Options Post Reply Quote barqyDev Report Post Thanks(0) Quote Reply Posted: 10 Feb 12 at 8:30PM
	I'm using Visual Studio 2010 in a MFC Dialog App and I would like to be able to place images in my PDF that come from bitmaps stored in my resource file reason 1 - don't want to have files travelling with the app. I'd like it as standalone as possible reason 2 - don't want to create temporary files on disk just to load with AddImageFromFile() I've tried loading the image into memory with CImage: CImage Image; Image.LoadFromResource( AfxGetInstanceHandle(), MAKEINTRESOURCE(IDB_VESSIX) ); I have access to the bitmap data via Image.GetBits(), but it's not clear to me what format data AddImageFromString() actually wants. I know it takes a std::string parameter, but that doesn't say what it's expecting. Any help would be appreciated! Edited by barqyDev - 11 Feb 12 at 8:04AM