急！怎样把内存中的数据块显示出来？？

einhep 2011-08-25 02:48:19



int CMyFile::Draw(PVOID pdata1)

{



	DATA* pd = (DATA*)pdata1;

	CDC* dc = pd->pdc;

	int data_h = pd->h;

	int dc_h   = pd->rby - pd->lty+1; 	

	int dc_w = pd->rbx - pd->ltx+1;

	int colorwidth = 4*((dc_w*8+31)/32);

	short* p = pd->pdata;



	LPBITMAPINFO bi;

	bi = (BITMAPINFO*)new BYTE[sizeof(BITMAPINFOHEADER)+256*sizeof(RGBQUAD)];//申请空间



	bi->bmiHeader.biBitCount = 8;

	bi->bmiHeader.biClrImportant = 0;

	bi->bmiHeader.biCompression = BI_RGB;

	bi->bmiHeader.biHeight = dc_h;

	bi->bmiHeader.biPlanes = 1;

	bi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);

	bi->bmiHeader.biSizeImage = 0;

	bi->bmiHeader.biWidth = dc_w;

	bi->bmiHeader.biXPelsPerMeter = 0;

	bi->bmiHeader.biYPelsPerMeter = 0;



	for (int ii = 0; ii < 256;ii++)

	{

		bi->bmiColors[ii].rgbBlue = ii;

		bi->bmiColors[ii].rgbGreen= ii;

		bi->bmiColors[ii].rgbRed = ii;

		bi->bmiColors[ii].rgbReserved = 0;

	}



	BYTE* lpBits;

	CDC* memdc=new CDC();

	memdc->CreateCompatibleDC(dc);

	HBITMAP hBitmap=::CreateDIBSection(memdc->m_hDC,bi,DIB_RGB_COLORS,(void**)&lpBits,NULL,0);

	if (!hBitmap)

	{

		AfxMessageBox(TEXT("111"));

	}

	ASSERT(hBitmap!=NULL);



	int j =0;

	float ratio = (float)pd->h/(float)dc_h;

	for(int i = 0; i < colorwidth;++i)

	{

		for (j = 0;j < dc_h;++j)

		{

			//lpBits[i*dc_h+j] = ((p[(int)( pd->h * i +j*ratio)]+32768)>>8);

		}

	}



	HBITMAP oldbitmap = (HBITMAP)memdc->SelectObject(hBitmap);

	dc->BitBlt(pd->ltx,pd->lty,dc_w,dc_h,memdc,0,0,SRCCOPY);

	memdc->SelectObject(oldbitmap);

	

	delete bi;

	DeleteObject(hBitmap);

	memdc->DeleteDC();

	delete memdc;



	return 1;

}

我用的CreateDIBSection函数总是得不到正确的图像

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einhep 2011-08-25

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[Quote=引用 4 楼 ndy_w 的回复:]

1 行
2 4byte aligned
[/Quote]

哦了谢谢

ndy_w 2011-08-25

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1 行
2 4byte aligned

einhep 2011-08-25

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[Quote=引用 1 楼 ndy_w 的回复:]

CreateDIBSection出来的不要selectObject，它不是compatiblebitmap。用SetDIBitsToDevice直接画到你的dc上就行了。
[/Quote]
1请问CreateDIBSection得到的内存中图像数据是按行存储的么，例如第一行，然后第二行。还是按列存储的
2请问每行需要4字节对齐么？

谢谢大神啦！

einhep 2011-08-25