Nice tips @Leon, many thanks for your help!

Hello all & Thanks for reading this, -I would have a question on you: -I have created a small application on MFC/C++ that draw different geometric shapes on screen using the mouse (like Paint). These shapes can be moved and rotated, so, I had to keep all these created shapes in a vector and draw all of them in OnDraw(). -My problem is, when I create many shapes (more than 50-60) and I try to move/rotate one of the shapes, these movements/rotations become very-very slow. -Could you give me some tips in order to make my application faster when moving/rotating?

OnDraw(CDC* pDC)
{

for (int i = 0; i < numberObjects; i++)
objects\[i\]->DrawShape(pDC);

}

Many thanks!

Actually the problem was related to the way of copying from srcHDC to ImageHDC. I have done like this:

HDC svgDC = cairo_win32_surface_get_dc(surface);

image.Create(width, height, 32);

image.SetHasAlphaChannel(TRUE);

HDC imageHDC = image.GetDC();

BLENDFUNCTION blend = { AC_SRC_OVER, 0, 255, AC_SRC_ALPHA };
AlphaBlend(imageHDC, 0, 0, width, height, svgDC, 0, 0, width, height, blend);

image.ReleaseDC();

Best regards!

Hi all, I need some help from you: I try to render an SVG image on the screen (with alpha channel). The problem is, when I try to draw the image on the screen, I see absolutely nothing. First of all, my SVG image is loaded correctly, and the ATL CImage from the below code, contains a correct image. The problem start when I try to use Gdiplus + alpha channel. For instance, if I use PixelFormat24bppRGB instead of PixelFormat32bppARGB, the image is drawn correctly, but alpha channel is not preserved - a black halo is shown around my image. Do you see any problem in my code? PS: I use Win7, 32 bit + Visual Studio 2013 Ultimate. Many thanks!

void CAppView::OnDraw(CDC* pDC)
{

int width = 600, height = 600;

GError\* pError = NULL;

rsvg\_init();
g\_my\_svg = rsvg\_handle\_new\_from\_file("d:\\\\myImage.svg", &pError);
rsvg\_handle\_get\_dimensions(g\_my\_svg, &g\_dimension);


cairo\_surface\_t \*surface = cairo\_win32\_surface\_create\_with\_dib(CAIRO\_FORMAT\_ARGB32, width, height);
cairo\_t\* cr = cairo\_create(surface);

rsvg\_handle\_render\_cairo(g\_my\_svg, cr);

HDC srcHDC = cairo\_win32\_surface\_get\_dc(surface);

// Create ATL CImage, then, copy the content of srcHDC in the CImage HDC
CImage image;
image.Create(width, height, 32);

HDC imageHDC = image.GetDC();

TransparentBlt(imageHDC, 0, 0, width, height, srcHDC, 0, 0, width, height, RGB(0, 0, 0));


// Initialize Gdiplus
Gdiplus::GdiplusStartupInput gdiplusStartupInput;
ULONG\_PTR gdiplusToken;
Gdiplus::GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);

// Problems starts from this point.

// Create a Gdiplus bitmap, and copy the content of CImage in bitmap, then write the bitmap on the screen.
Gdiplus::Bitmap bmp(image.GetWidth(), image.GetHeight(), image.GetPitch(), PixelFormat32bppARGB, static\_cast(image.GetBits()));
Gdiplus::Graphics graphics(pDC->GetSafeHdc());
graphics.DrawImage(&bmp, Gdiplus::Rect(0, 0, width, height));



Gdiplus::GdiplusShutdown(gdiplusToken);
image.ReleaseDC();
image.Destroy();
cairo\_surface\_flush(surface);
cairo\_destroy(cr);
cairo\_surface\_destroy(surface);

}

Hello all,

I need a little help: I want to create an application that automatize different applications in the sense that my application will be able to press automatically different buttons on another application.

For example: my application will start, let's say, Microsoft Office, will press some buttons in MSOffice, and will close MSOffice.

Could you give me an idea how to do that ? I have no clue... some code in C/C++ would be perfect.

Thank you very much!

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