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/DynaPDF/Web Edition/WebPicture from PDF Page Web
Required plugins for this example: MBS DynaPDF Plugin
You find this example project in your Plugins Download as a Xojo project file within the examples folder: /DynaPDF/Web Edition/WebPicture from PDF Page Web
This example is the version from Mon, 16th Jan 2022.
Project "WebPicture from PDF Page Web.xojo_binary_project"
Class App Inherits WebApplication
End Class
Class Session Inherits WebSession
Const ErrorDialogCancel = "Do Not Send"
Const ErrorDialogMessage = "This application has encountered an error and cannot continue."
Const ErrorDialogQuestion = "Please describe what you were doing right before the error occurred:"
Const ErrorDialogSubmit = "Send"
Const ErrorThankYou = "Thank You"
Const ErrorThankYouMessage = "Your feedback helps us make improvements."
Const NoJavascriptInstructions = "To turn Javascript on, please refer to your browser settings window."
Const NoJavascriptMessage = "Javascript must be enabled to access this page."
End Class
Class MainPage Inherits WebPage
Control ImageView1 Inherits WebImageViewer
ControlInstance ImageView1 Inherits WebImageViewer
End Control
Control Timer1 Inherits WebTimer
ControlInstance Timer1 Inherits WebTimer
EventHandler Sub Run()
Start
End EventHandler
End Control
Function FindFile(name as string) As FolderItem
// Look for file in parent folders from executable on
dim parent as FolderItem = app.ExecutableFile.Parent
while parent<>Nil
dim file as FolderItem = parent.Child(name)
if file<>Nil and file.Exists then
Return file
end if
parent = parent.Parent
wend
End Function
Function RenderPDFWebPicture(file as FolderItem, pageIndex as integer, width as integer, height as integer) As WebPicture
Dim pdf As New DynaPDFMBS
// create PDF environment and setup
If pdf.CreateNewPDF(Nil) Then
if pdf.SetImportFlags(pdf.kifImportAsPage + pdf.kifImportAll) then
// open source file
If pdf.OpenImportFile(file) >= 0 Then
// import file
if pdf.Append then
If pdf.ImportPageEx(PageIndex, 1.0, 1.0) >= 0 Then
if pdf.EndPage then
// make a jpeg
If pdf.SetJPEGQuality(80) Then
// render 1x
If pdf.RenderPageToImage(pageIndex, Nil, 72, width, height, pdf.krfDefault, pdf.kpxfRGB, pdf.kcfJPEG, pdf.kifmJPEG) Then
Dim LowData As String = pdf.GetImageBuffer
// render 2x
If pdf.RenderPageToImage(pageIndex, Nil, 144, width, height, pdf.krfDefault, pdf.kpxfRGB, pdf.kcfJPEG, pdf.kifmJPEG) Then
Dim HighData As String = pdf.GetImageBuffer
// now build 1x picture
Dim w As New WebPicture(LowData, "page.jpg")
// and put in 2x data
w.data = HighData
// and return with HiDPI content
Return w
end if
end if
end if
end if
end if
end if
end if
end if
End If
End Function
Function RenderPDFWebPicture(PDFData as String, pageIndex as integer, width as integer, height as integer) As WebPicture
Dim pdf As New DynaPDFMBS
// create PDF environment and setup
If pdf.CreateNewPDF(Nil) Then
if pdf.SetImportFlags(pdf.kifImportAsPage + pdf.kifImportAll) then
// open source file
If pdf.OpenImportBuffer(PDFData) >= 0 Then
// import file
if pdf.Append then
If pdf.ImportPageEx(PageIndex, 1.0, 1.0) >= 0 Then
if pdf.EndPage then
// make a jpeg
If pdf.SetJPEGQuality(80) Then
// render 1x
If pdf.RenderPageToImage(pageIndex, Nil, 72, width, height, pdf.krfDefault, pdf.kpxfRGB, pdf.kcfJPEG, pdf.kifmJPEG) Then
Dim LowData As String = pdf.GetImageBuffer
// render 2x
If pdf.RenderPageToImage(pageIndex, Nil, 144, width, height, pdf.krfDefault, pdf.kpxfRGB, pdf.kcfJPEG, pdf.kifmJPEG) Then
Dim HighData As String = pdf.GetImageBuffer
// now build 1x picture
Dim w As New WebPicture(LowData, "page.jpg")
// and put in 2x data
w.data = HighData
// and return with HiDPI content
Return w
end if
end if
end if
end if
end if
end if
end if
end if
End If
End Function
Sub Start()
// quickly render one PDF with given page
dim w as integer = ImageView1.Width
dim h as integer = ImageView1.Height
dim file as Folderitem = FindFile("license.pdf")
if file = nil or file.Exists = false then
MessageBox "Please change path to test file."
else
dim wp as WebPicture = RenderPDFWebPicture(file, 1, w, h)
ImageView1.Picture = wp
end if
End Sub
End Class
Class MyDynaPDFMBS Inherits DynaPDFMBS
EventHandler Function Error(ErrorCode as integer, ErrorMessage as string, ErrorType as integer) As integer
// output all messages on the console:
System.DebugLog str(ErrorCode)+": "+ErrorMessage
Return 0 // ignore
End EventHandler
Property IgnoreWarnings As Boolean
End Class
End Project
See also:
The items on this page are in the following plugins: MBS DynaPDF Plugin.