Copy the current image of the screen to file

Someone at - it a code that will copy what is on the screen of an application and write it in an image file?  This way the user can save what is currently on the screen of the app for later.

It took some digging so I amo put my final code of work here for someone else:

void mainapp::write_bitmap_header(int nbytes, QByteArray& ba, const int size[])
{
    char header[54];

    /* Set standard bitmap header */
    header[0] = 'B';
    header[1] = 'M';
    header[2] = nbytes & 0xff;
    header[3] = (nbytes >> 8) & 0xff;
    header[4] = (nbytes >> 16) & 0xff;
    header[5] = (nbytes >> 24) & 0xff;
    header[6] = 0;
    header[7] = 0;
    header[8] = 0;
    header[9] = 0;
    header[10] = 54;
    header[11] = 0;
    header[12] = 0;
    header[13] = 0;
    header[14] = 40;
    header[15] = 0;
    header[16] = 0;
    header[17] = 0;
    header[18] = size[0] & 0xff;
    header[19] = (size[0] >> 8) & 0xff;
    header[20] = (size[0] >> 16) & 0xff;
    header[21] = (size[0] >> 24) & 0xff;
    header[22] = -size[1] & 0xff;
    header[23] = (-size[1] >> 8) & 0xff;
    header[24] = (-size[1] >> 16) & 0xff;
    header[25] = (-size[1] >> 24) & 0xff;
    header[26] = 1;
    header[27] = 0;
    header[28] = 32;
    header[29] = 0;
    header[30] = 0;
    header[31] = 0;
    header[32] = 0;
    header[33] = 0;
    header[34] = 0; /* image size*/
    header[35] = 0;
    header[36] = 0;
    header[37] = 0;
    header[38] = 0x9;
    header[39] = 0x88;
    header[40] = 0;
    header[41] = 0;
    header[42] = 0x9l;
    header[43] = 0x88;
    header[44] = 0;
    header[45] = 0;
    header[46] = 0;
    header[47] = 0;
    header[48] = 0;
    header[49] = 0;
    header[50] = 0;
    header[51] = 0;
    header[52] = 0;
    header[53] = 0;

    ba.append(header, sizeof(header));
}

void mainapp::capture()
{
        screen_pixmap_t screen_pix;
    screen_buffer_t screenshot_buf;
    char *screenshot_ptr = NULL;
    int screenshot_stride = 0;
    screen_context_t context;
    screen_create_context(&context, 0);
    int usage, format;
    int size[2];

    screen_create_pixmap(&screen_pix, context);

    usage = SCREEN_USAGE_READ | SCREEN_USAGE_NATIVE;
    screen_set_pixmap_property_iv(screen_pix, SCREEN_PROPERTY_USAGE, &usage);

    format = SCREEN_FORMAT_RGBA8888;
    screen_set_pixmap_property_iv(screen_pix, SCREEN_PROPERTY_FORMAT, &format);

    int width = 720 ;
    int height = 1280;
    size[0] = width;
    size[1] = height;
    screen_set_pixmap_property_iv(screen_pix, SCREEN_PROPERTY_BUFFER_SIZE, size);

    screen_create_pixmap_buffer(screen_pix);
    screen_get_pixmap_property_pv(screen_pix, SCREEN_PROPERTY_RENDER_BUFFERS,
                                  (void**)&screenshot_buf);
    screen_get_buffer_property_pv(screenshot_buf, SCREEN_PROPERTY_POINTER,
                                  (void**)&screenshot_ptr);
    screen_get_buffer_property_iv(screenshot_buf, SCREEN_PROPERTY_STRIDE,
                                  &screenshot_stride);

    screen_read_window(Application::instance()->mainWindow()->handle(), screenshot_buf, 0, NULL ,0);

    QByteArray array;

    int nbytes = size[0] * size[1] * 4;
    write_bitmap_header(nbytes, array, size);

    for (int i = 0; i < size[1]; i++)
    {
        array.append(screenshot_ptr + i * screenshot_stride, size[0] * 4);
    }

    QImage image = QImage::fromData(array, "BMP");
    QFile outFile("shared/photos/temp1.jpeg");
    outFile.open(QIODevice::WriteOnly);
    image.save(&outFile, "JPEG");

    screen_destroy_pixmap(screen_pix);
}

Tags: BlackBerry Developers

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