怎样把PDA的屏幕捕捉下来保存JPG格式?

ryl_522

怎样把PDA的屏幕捕捉下来保存JPG格式? [复制链接]

如题:
要用到哪些函数?

kiney

可以想办法用Graphics获取当前屏幕的，生成BITMAP，可是，要转成文件，好象没有办法。
我已经研究BITMAP保存问题好几天了

zjl2050

我的BLOG中有 可是没有转JPG的   只能转BMP  我提供一个函数即可高顶

mxcb2008

抓取屏幕可以用下面代码
void SaveScreen(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 = fopen(filename, "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);
}

保存成BMP，可以用IJG的JpegLib。

alibj

好东西,看看.

ping1125

晕,这个例子我在网上早找到了,是EVC用的 ,但不知道怎么转成C#的