请教下libjpeg读取RGB的问题

[chp845]

#define WIDTHBYTES(bits) (((bits) + 31) / 32 * 4)

int nHeight = cinfo.image_height;  
	int nWidth  = cinfo.image_width; 
	int nBits = cinfo.num_components;

	unsigned char * pRGB = new unsigned char[cinfo.image_width *cinfo.image_height * cinfo.num_components];
	jpeg_start_decompress(&cinfo);  
	JSAMPROW row_pointer[1]; 
	while(cinfo.output_scanline < cinfo.output_height)  
	{  
		row_pointer[0]=&pRGB[cinfo.output_scanline*cinfo.image_width*cinfo.num_components];  
		jpeg_read_scanlines(&cinfo, row_pointer, 1);  
	}  

	int nWidthEx = WIDTHBYTES( 24 * nWidth);
	int nLineTailDest = nWidthEx - 3 * nWidth;
	unsigned char * pRGBA = new unsigned char[nHeight * nWidthEx];
	memset(pRGBA, 0, nHeight * nWidthEx);

	BYTE *p1 = (BYTE*)pRGBA;
	for (unsigned int i = 0; i < nHeight; i++)
	{
		unsigned char * pStart = pRGB + i * nWidth * cinfo.num_components; //num_components等于3
		for (unsigned int j = 0; j < nWidth; j++)
		{
			UINT b = *pStart++;
			UINT g = *pStart++;
			UINT r = *pStart++;
			*p1++ = r;
			*p1++ = g;
			*p1++ = b;
		}
		p1 += nLineTailDest;
	}

请问下,我用libjpeg读取jpeg(24位)图片,读取出位图RGB的数据,
我使用:
bitmap.CreateBitmap(GetImageW(pData), GetImageH(pData), 1, 24, GetImageBuf(pData));
BITMAP bim;
bitmap.GetBitmap(&bim);
但是在屏幕上面无法显示,但是bim又可以获取到值,请教下这是怎么回事呀?

[chp845]

有人可以帮助解答下吗?

[panyufeng000]

引用 楼主 chp845 的回复:

#define WIDTHBYTES(bits) (((bits) + 31) / 32 * 4) C/C++ code?123456789101112131415161718192021222324252627282930313233int nHeight = cinfo.image_height; int nWidth = cinfo.image_……

内存对齐不正确！