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bmp loading problem

Started by darksteel Nov 4, 2004 at 12:47 PM 5 replies 950+ views

Original Post

Nov 4, 2004 at 12:47 PM

I have been having some difficulty with a bmp loading fucntion i am trying to write using only c++. Here is the code for my function.



unsigned char *LoadBitmapFile(char *filename, BITMAPINFOHEADER *bitmapInfoHeader)
{
	fstream File;
	
	BITMAPFILEHEADER	bitmapFileHeader;	
	int			imageIdx = 0;		
	unsigned char		tempRGB;			

	File.open(filename, ios::in|ios::binary);

	if(File.is_open())
	{
	File.read((char*)&bitmapFileHeader, sizeof(BITMAPFILEHEADER));

		if (bitmapFileHeader.bfType != BITMAP_ID)
		{
			File.close();
			return 0;
		}

		File.seekg(bitmapFileHeader.bfOffBits, ios::beg);
		
		bitmapImage = new paul [bitmapInfoHeader->biSizeImage];

	    if (!bitmapImage)
		{
			delete[] bitmapImage;
			File.close();
			return 0;	
		}

		File.read((char*)bitmapImage,bitmapInfoHeader->biSizeImage);
	if(bitmapImage==NULL)
		{
			File.close();
			return 0;
		}
		for (imageIdx = 0; imageIdx < bitmapInfoHeader->biSizeImage; imageIdx+=3)
		{
			tempRGB = bitmapImage[imageIdx];
			bitmapImage[imageIdx] = bitmapImage[imageIdx + 2];
			bitmapImage[imageIdx + 2] = tempRGB;
		}
	File.close();
	}
	else
	{
		return 0;
	}
	return bitmapImage;
}

The call is made like this bitmapData=LoadBitmapFile("pic.bmp",&bitmapInfoHeader); I know the problem is not with displaying te texture as I have got the texture to display properly using someone elses function. DS [Edited by - darksteel on November 5, 2004 8:10:05 AM]

Android_s

Nov 4, 2004 at 5:13 PM

To pinpoint any problem it would be good to know if you got any error messages whn compiling. If your code look exactly like that you should have gotten a few [smile]

Oh, and use the[ source] and [ /souce] tags to post code (without the whitespaces of course...)

owiley

Nov 4, 2004 at 6:09 PM

hey man what your pproblem? do it compile or do it spit out a gazirion errors

darksteel

Nov 5, 2004 at 8:06 AM

It compiles and I get no errors it runs okay but the image isnt loaded. Thanks for the quick reply though.

CrystalClear

Nov 5, 2004 at 8:57 AM

Cant say what your problem is but this is a lot simpler

bool Texture::Load( char *name ){	HBITMAP hbmp;	BITMAP	bmp;	glGenTextures( 1, &texture[0] );	hbmp=(HBITMAP)LoadImage( NULL, name, IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE|LR_CREATEDIBSECTION );	if( hbmp!=NULL )	{		GetObject( hbmp, sizeof(bmp), &bmp );		glPixelStorei( GL_UNPACK_ALIGNMENT, 4 );		glBindTexture( GL_TEXTURE_2D, texture[0] );		glTexImage2D( GL_TEXTURE_2D, 0, 3, bmp.bmWidth, bmp.bmHeight, 0, GL_BGR_EXT, GL_UNSIGNED_BYTE, bmp.bmBits );		glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );		glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );		DeleteObject( hbmp );		return true;	}	return false;}

owiley

Nov 5, 2004 at 11:47 AM

do you get a message box from this

if (!bitmapImage)		{			MessageBox(/*your HWND*/,"error bitmap could not load!","eror!!!!!!",MB_OK);			delete[] bitmapImage;			File.close();			return 0;			}

darksteel

Nov 5, 2004 at 12:53 PM

Thanks for the help. I have solved the problem it was to do with the memory used to hold the image data but its working now thanks to everyone who replied Cheers

DS

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