I'm currently evaluating quick pdf dll and met some potetionally problem.

So, i need to determine empty area (box) on each page at the exact position. For that purpose I use RenderPageToString method and then examin area pixels. The problem is that method RenderPageToString is too slow - for example, the page (A4) has some content on it and method execution for the area 100x30 going to 500 ms.

The pseudo code:

...

sWatch = new System.Diagnostics.Stopwatch();

QP.SetRenderArea(BoxLeftH, BoxTopH, BoxWidth, BoxHeight); //BoxWidth is about 190, BoxHeight is about 30

sWatch.Start();

byte[] K = QP.RenderPageToString(72, selectedPage, 0);

sWatch.Stop();

MS = new MemoryStream(K,false);

...

- sWatch.ElapsedMilliseconds is in range 40-500ms!, depending on the page.

Do I something wrong? Do you have some suggestion?

Thanks,

Miodrag

SetRenderArea is only going to work when you are rendering the page to an image format using a function such as RenderPageToFile. So it can crop a page when you are rendering to an image, but it won't let you crop an existing PDF and then save it as an update to the PDF. It's only for rendering, not for modifying existing documents.

Cheers,

- Rowan.

Is it mean I can now really crop page, as I was asking here:

http://www.quickpdf.org/forum/setpagebox-capturepageex-drawcapturedpage_topic3048.html

We have added a new function in version 12 called SetRenderArea which will let you render only a portion of the page. The difference between using the CropBox to do this and the SetRenderArea page is that while specifying a CropBox smaller than the actual page size will output the cropped page, the entire page behind the scenes is processed. The SetRenderArea will be faster because it will only process the area of the page that is specified.

Cheers,

- Rowan.

 

As far as i know that's the way...

 

Cheers and welcome here,

Ingo