wince下全屏截图并保存为bmp格式
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最初使用的截屏方法说来还真有些丢人,一个一个点的取得颜色值,再保存到bmp文件中去,这样程序运行的速度超慢,保存一个800X600的bmp差不多要一两分钟(研华8251板),觉得有些不对头,决定想办法改进一下,就使劲地看了一下Charles Petzold先生的《Programming Windows》(这本书很经典,值得好好研究一下),终于把时间缩短到几秒钟了,下面这个函数在evc和vc下都test pass(不用更改),有不足之处欢迎指正,函数:
// this function create a bmp file to save the current screen;
// supported eVC++ 4.0 (wince 4.0) and vc++ 6.0 , test pass;
void CSnapDlg::OnScreenSave(const char *filename)
{
HDC hScrDC, hMemDC;
int width, height;
//the pointer will save all pixel point's color value
BYTE *lpBitmapBits = NULL;
//creates a device context for the screen device
hScrDC = CreateDC(_T("DISPLAY"), NULL, NULL, NULL);
//get the screen point size
width = GetDeviceCaps(hScrDC, HORZRES);
height = GetDeviceCaps(hScrDC, VERTRES);
//creates a memory device context (DC) compatible with the screen device(hScrDC)
hMemDC = CreateCompatibleDC(hScrDC);
//initialise the struct BITMAPINFO for the bimap infomation,
//in order to use the function CreateDIBSection
// on wince os, each pixel stored by 24 bits(biBitCount=24)
//and no compressing(biCompression=0)
BITMAPINFO RGB24BitsBITMAPINFO;
ZeroMemory(&RGB24BitsBITMAPINFO, sizeof(BITMAPINFO));
RGB24BitsBITMAPINFO.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
RGB24BitsBITMAPINFO.bmiHeader.biWidth = width;
RGB24BitsBITMAPINFO.bmiHeader.biHeight = height;
RGB24BitsBITMAPINFO.bmiHeader.biPlanes = 1;
RGB24BitsBITMAPINFO.bmiHeader.biBitCount = 24;
//use the function CreateDIBSection and SelectObject
//in order to get the bimap pointer : lpBitmapBits
HBITMAP directBmp = CreateDIBSection(hMemDC, (BITMAPINFO*)&RGB24BitsBITMAPINFO,
DIB_RGB_COLORS, (void **)&lpBitmapBits, NULL, 0);
HGDIOBJ previousObject = SelectObject(hMemDC, directBmp);
// copy the screen dc to the memory dc
BitBlt(hMemDC, 0, 0, width, height, hScrDC, 0, 0, SRCCOPY);
//if you only want to get the every pixel color value,
//you can begin here and the following part of this function will be unuseful;
//the following part is in order to write file;
//bimap file header in order to write bmp file
BITMAPFILEHEADER bmBITMAPFILEHEADER;
ZeroMemory(&bmBITMAPFILEHEADER, sizeof(BITMAPFILEHEADER));
bmBITMAPFILEHEADER.bfType = 0x4d42; //bmp
bmBITMAPFILEHEADER.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);
bmBITMAPFILEHEADER.bfSize = bmBITMAPFILEHEADER.bfOffBits + ((width*height)*3); ///3=(24 / 8)
//write into file
FILE *mStream = NULL;
if((mStream = fopenfilename, "wb")))
{
//write bitmap file header
fwrite(&bmBITMAPFILEHEADER, sizeof(BITMAPFILEHEADER), 1, mStream);
//write bitmap info
fwrite(&(RGB24BitsBITMAPINFO.bmiHeader), sizeof(BITMAPINFOHEADER), 1, mStream);
//write bitmap pixels data
fwrite(lpBitmapBits, 3*width*height, 1, mStream);
//close file
fclose(mStream);
}
//delete
DeleteObject(hMemDC);
DeleteObject(hScrDC);
DeleteObject(directBmp);
DeleteObject(previousObject);
}
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