Use aspose. pdf to change the PDF File Content

Source: huide Control Network http://www.evget.com/zh-CN/Info/catalog/18035.html

Aspose. pdf contains a pdffileeditor class resizecontents method that allows you to adjust the page content in the PDF file. The contentsresizeparameters class is used to specify the parameters to be used to adjust the page. You can use the resizecontents method to adjust the specific content of all pages or one page.

C #

//Create PdfFileEditor ObjectPdfFileEditor fileEditor = new PdfFileEditor();//Open PDF DocumentDocument doc = new Document("input.pdf");//Specify Parameter to be used for resizingPdfFileEditor.ContentsResizeParameters parameters = new PdfFileEditor.ContentsResizeParameters(//left margin = 10% of page widthPdfFileEditor.ContentsResizeValue.Percents(10),//new contents width calculated automatically as width - left margin - right margin (100% - 10% - 10% = 80%)null,//right margin is 10% of pagePdfFileEditor.ContentsResizeValue.Percents(10),//top margin = 10% of heightPdfFileEditor.ContentsResizeValue.Percents(10),//new contents height is calculated automatically (similar to width)null,//bottom margin is 10%PdfFileEditor.ContentsResizeValue.Percents(10));//Resize Page ContentsfileEditor.ResizeContents(doc, new int[] { 1, 2, 3 }, parameters);//save document into new location.doc.Save("output.pdf");

VB. NET

'Create PdfFileEditor ObjectDim fileEditor As New PdfFileEditor()'Open PDF DocumentDim doc As New Document("input.pdf")'Specify Parameter to be used for resizing'left margin = 10% of page width'new contents width calculated automatically as width - left margin - right margin (100% - 10% - 10% = 80%)'right margin is 10% of page'top margin = 10% of height'new contents height is calculated automatically (similar to width)'bottom margin is 10%Dim parameters As New PdfFileEditor.ContentsResizeParameters(PdfFileEditor.ContentsResizeValue.Percents(10), Nothing, PdfFileEditor.ContentsResizeValue.Percents(10), PdfFileEditor.ContentsResizeValue.Percents(10), Nothing, PdfFileEditor.ContentsResizeValue.Percents(10))'Resize Page ContentsfileEditor.ResizeContents(doc, New Integer() { 1, 2, 3 }, parameters)'save document into new location.doc.Save("output.pdf")