GetImageID not working?

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   I'm trying to resize all images in a PDF (using the dll-version from c#) and tried to use GetImageID to get the Id of the image that is being replaced. After consulting the manual I found out that GetImageID only returns IDs of images that have been added to the document. But how do you get the ID of an image already existing in the document?

for (int pageIdx = 0; pageIdx < qp.PageCount(); pageIdx++)
{
   qp.SelectPage(pageIdx);
   var imageListID = qp.GetPageImageList(0);
   for (int imageIdx = 1; imageIdx <= qp.GetImageListCount(imageListID); imageIdx++)
   {
      var image = new Bitmap(new MemoryStream(qp.GetImageListItemDataToString(imageListID, imageIdx, 0)));
      image = ResizeBitmap(ref image);
      int oldId = qp.GetImageID(imageIdx);
      int newId = qp.AddImageFromString(ImageToByte(image), 0);
      qp.ReplaceImage(oldId, newId);
      qp.ClearImage(oldId);
   }
}

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Bjarke Members Profile Find Members Posts Beginner Joined: 18 Feb 13 Status: Offline Points: 3	Post Options Post Reply Quote Bjarke Report Post Thanks(0) Quote Reply Topic: GetImageID not working? Posted: 19 Feb 13 at 3:07PM
	I'm trying to resize all images in a PDF (using the dll-version from c#) and tried to use GetImageID to get the Id of the image that is being replaced. After consulting the manual I found out that GetImageID only returns IDs of images that have been added to the document. But how do you get the ID of an image already existing in the document? for (int pageIdx = 0; pageIdx < qp.PageCount(); pageIdx++) { qp.SelectPage(pageIdx); var imageListID = qp.GetPageImageList(0); for (int imageIdx = 1; imageIdx <= qp.GetImageListCount(imageListID); imageIdx++) { var image = new Bitmap(new MemoryStream(qp.GetImageListItemDataToString(imageListID, imageIdx, 0))); image = ResizeBitmap(ref image); int oldId = qp.GetImageID(imageIdx); int newId = qp.AddImageFromString(ImageToByte(image), 0); qp.ReplaceImage(oldId, newId); qp.ClearImage(oldId); } }

Ingo Members Profile Find Members Posts Moderator Group Joined: 29 Oct 05 Status: Offline Points: 3530	Post Options Post Reply Quote Ingo Report Post Thanks(0) Quote Reply Posted: 19 Feb 13 at 8:37PM
	Hi! FindImage you'll need: http://www.debenu.com/docs/pdf_library_reference/FindImages.php Cheers and welcome here, Ingo

Bjarke Members Profile Find Members Posts Beginner Joined: 18 Feb 13 Status: Offline Points: 3	Post Options Post Reply Quote Bjarke Report Post Thanks(0) Quote Reply Posted: 20 Feb 13 at 8:23AM
	FindImages returns the number of images found - how can I access the images and get their ImageID?

Ingo Members Profile Find Members Posts Moderator Group Joined: 29 Oct 05 Status: Offline Points: 3530	Post Options Post Reply Quote Ingo Report Post Thanks(0) Quote Reply Posted: 20 Feb 13 at 9:36PM
	Yes... Sorry... You're right. Resizing images in an existing pdf won't work. Getting the data of all images in a pdf is possible. Anywhere (perhaps in the samples-section or an old newsletter) should be a sample. Cheers, Ingo

Bjarke Members Profile Find Members Posts Beginner Joined: 18 Feb 13 Status: Offline Points: 3	Post Options Post Reply Quote Bjarke Report Post Thanks(0) Quote Reply Posted: 21 Feb 13 at 3:08PM
	So ReplaceImage(oldID, newID) only works with images that you have added to a pdf? Is there really no other way of replacing images already existing in a pdf?

Ingo Members Profile Find Members Posts Moderator Group Joined: 29 Oct 05 Status: Offline Points: 3530	Post Options Post Reply Quote Ingo Report Post Thanks(0) Quote Reply Posted: 21 Feb 13 at 8:57PM
	Changing the content of a ready made pdf is hard stuff! There will be ways but not with QuickPDF in a comfortable way ;-) You should read the developer guid and the reference guide then you'll know more. The library has many functions for a low cost price. It's a good solution for many issues - for real pdf modifying not. Cheers, Ingo