Examples with BITMAP com.sun.jna.platform.win32.WinGDI.BITMAP used on opensource projects

Example 1 with BITMAP

use of com.sun.jna.platform.win32.WinGDI.BITMAP in project jna by java-native-access.

the class GDI32Test method testGetObject.

public void testGetObject() throws Exception {
    final ICONINFO iconInfo = new ICONINFO();
    final HANDLE hImage = User32.INSTANCE.LoadImage(null, new File(getClass().getResource("/res/test_icon.ico").toURI()).getAbsolutePath(), WinUser.IMAGE_ICON, 0, 0, WinUser.LR_LOADFROMFILE);
    try {
        // obtain test icon from classpath
        if (!User32.INSTANCE.GetIconInfo(new HICON(hImage), iconInfo))
            throw new Exception("Invocation of User32.GetIconInfo() failed: " + Kernel32Util.getLastErrorMessage());
        iconInfo.read();
        // test GetObject method
        BITMAP bmp = new BITMAP();
        int nWrittenBytes = GDI32.INSTANCE.GetObject(iconInfo.hbmColor, bmp.size(), bmp.getPointer());
        bmp.read();
        if (nWrittenBytes <= 0)
            throw new Exception("Detection of bitmap information failed: " + Kernel32Util.getLastErrorMessage());
        // verify that bitmap information was successfully detected
        assertEquals(32, bmp.bmHeight.intValue());
        assertEquals(32, bmp.bmWidth.intValue());
    } finally {
        if (iconInfo.hbmColor != null && iconInfo.hbmColor.getPointer() != Pointer.NULL)
            GDI32.INSTANCE.DeleteObject(iconInfo.hbmColor);
        if (iconInfo.hbmMask != null && iconInfo.hbmMask.getPointer() != Pointer.NULL)
            GDI32.INSTANCE.DeleteObject(iconInfo.hbmMask);
    }
}

Example 2 with BITMAP

use of com.sun.jna.platform.win32.WinGDI.BITMAP in project jna by java-native-access.

the class GDI32Util method getScreenshot.

/**
	 * Takes a screenshot of the given window
	 * 
	 * @param target
	 *            The window to target
	 * @return the window captured as a screenshot, or null if the BufferedImage doesn't construct properly
	 * @throws IllegalStateException
	 *             if the rectangle from GetWindowRect has a width and/or height
	 *             of 0. <br>
	 *             if the device context acquired from the original HWND doesn't
	 *             release properly
	 */
public static BufferedImage getScreenshot(HWND target) {
    RECT rect = new RECT();
    if (!User32.INSTANCE.GetWindowRect(target, rect)) {
        throw new Win32Exception(Native.getLastError());
    }
    Rectangle jRectangle = rect.toRectangle();
    int windowWidth = jRectangle.width;
    int windowHeight = jRectangle.height;
    if (windowWidth == 0 || windowHeight == 0) {
        throw new IllegalStateException("Window width and/or height were 0 even though GetWindowRect did not appear to fail.");
    }
    HDC hdcTarget = User32.INSTANCE.GetDC(target);
    if (hdcTarget == null) {
        throw new Win32Exception(Native.getLastError());
    }
    Win32Exception we = null;
    // device context used for drawing
    HDC hdcTargetMem = null;
    // handle to the bitmap to be drawn to
    HBITMAP hBitmap = null;
    // original display surface associated with the device context
    HANDLE hOriginal = null;
    // final java image structure we're returning.
    BufferedImage image = null;
    try {
        hdcTargetMem = GDI32.INSTANCE.CreateCompatibleDC(hdcTarget);
        if (hdcTargetMem == null) {
            throw new Win32Exception(Native.getLastError());
        }
        hBitmap = GDI32.INSTANCE.CreateCompatibleBitmap(hdcTarget, windowWidth, windowHeight);
        if (hBitmap == null) {
            throw new Win32Exception(Native.getLastError());
        }
        hOriginal = GDI32.INSTANCE.SelectObject(hdcTargetMem, hBitmap);
        if (hOriginal == null) {
            throw new Win32Exception(Native.getLastError());
        }
        // draw to the bitmap
        if (!GDI32.INSTANCE.BitBlt(hdcTargetMem, 0, 0, windowWidth, windowHeight, hdcTarget, 0, 0, GDI32.SRCCOPY)) {
            throw new Win32Exception(Native.getLastError());
        }
        BITMAPINFO bmi = new BITMAPINFO();
        bmi.bmiHeader.biWidth = windowWidth;
        bmi.bmiHeader.biHeight = -windowHeight;
        bmi.bmiHeader.biPlanes = 1;
        bmi.bmiHeader.biBitCount = 32;
        bmi.bmiHeader.biCompression = WinGDI.BI_RGB;
        Memory buffer = new Memory(windowWidth * windowHeight * 4);
        int resultOfDrawing = GDI32.INSTANCE.GetDIBits(hdcTarget, hBitmap, 0, windowHeight, buffer, bmi, WinGDI.DIB_RGB_COLORS);
        if (resultOfDrawing == 0 || resultOfDrawing == WinError.ERROR_INVALID_PARAMETER) {
            throw new Win32Exception(Native.getLastError());
        }
        int bufferSize = windowWidth * windowHeight;
        DataBuffer dataBuffer = new DataBufferInt(buffer.getIntArray(0, bufferSize), bufferSize);
        WritableRaster raster = Raster.createPackedRaster(dataBuffer, windowWidth, windowHeight, windowWidth, SCREENSHOT_BAND_MASKS, null);
        image = new BufferedImage(SCREENSHOT_COLOR_MODEL, raster, false, null);
    } catch (Win32Exception e) {
        we = e;
    } finally {
        if (hOriginal != null) {
            // per MSDN, set the display surface back when done drawing
            HANDLE result = GDI32.INSTANCE.SelectObject(hdcTargetMem, hOriginal);
            // failure modes are null or equal to HGDI_ERROR
            if (result == null || WinGDI.HGDI_ERROR.equals(result)) {
                Win32Exception ex = new Win32Exception(Native.getLastError());
                if (we != null) {
                    ex.addSuppressed(we);
                }
                we = ex;
            }
        }
        if (hBitmap != null) {
            if (!GDI32.INSTANCE.DeleteObject(hBitmap)) {
                Win32Exception ex = new Win32Exception(Native.getLastError());
                if (we != null) {
                    ex.addSuppressed(we);
                }
                we = ex;
            }
        }
        if (hdcTargetMem != null) {
            // get rid of the device context when done
            if (!GDI32.INSTANCE.DeleteDC(hdcTargetMem)) {
                Win32Exception ex = new Win32Exception(Native.getLastError());
                if (we != null) {
                    ex.addSuppressed(we);
                }
                we = ex;
            }
        }
        if (hdcTarget != null) {
            if (0 == User32.INSTANCE.ReleaseDC(target, hdcTarget)) {
                throw new IllegalStateException("Device context did not release properly.");
            }
        }
    }
    if (we != null) {
        throw we;
    }
    return image;
}