pdf files in vb.net

Question

I'm creating a program to generate PDF files in VB.Net.

Everything is working fine except that the image is being displayed with a blue background while the image provided doesn't have any.

Following are the lines of code being used:

sColor = IIf(mvarEncodeASCII85, ToASCII85(ImgColor),
    (System.Text.Encoding.GetEncoding(1252).GetString(ImgColor)))
The image is a bitmap image.

How can i solve the problem?

Matt John · Answer

Hi readers, The following simple example demonstrates similarity in syntax between VB and VB.NET. Both examples pop up a message box saying "Hello, World" with an OK button. Classic VB example: Private Sub Command1_Click() MsgBox "Hello, World" End Sub A VB.NET example, MsgBox or the MessageBox class can be used: Public Class Form1 Private Sub Button1_Click ( ByVal sender As System. Object , ByVal e As System. EventArgs ) Handles Button1. Click MsgBox ( "Hello, World" ) End Sub End Class Public Class Form1 Private Sub Button1_Click ( ByVal sender As System. Object , ByVal e As System. EventArgs ) Handles Button1. Click MessageBox. Show ( "Hello, World" ) End Sub End Class Both Visual Basic 6 and Visual Basic .NET will automatically generate the Sub End Sub statements when the corresponding button is clicked in design view. Visual Basic .NET will also generate the necessary Class and End Class and statements. The developer need only add the statement to display the "Hello, World" message box. Note that all procedure calls must be made with parentheses in VB.NET, whereas in VB6 there were different conventions for functions (parentheses required) and subs (no parentheses allowed, unless called using the keyword Call ). Also note that the names Command1 and Button1 are not obligatory. However, these are default names for a command button in VB6 and VB.NET respectively. In VB.NET, the Handles keyword is used to make the sub Button1_Click a handler for the Click event of the object Button1 . In VB6, event handler subs must have a specific name consisting of the object's name ("Command1"), an underscore ("_"), and the event's name ("Click", hence "Command1_Click"). There is a function called MsgBox in the Microsoft.VisualBasic namespace which can be used similarly to the corresponding function in VB6. There is a controversy about which function to use as a best practice (not only restricted to showing message boxes but also regarding other features of the Microsoft.VisualBasic namespace). Some programmers prefer to do things "the .NET way", since the Framework classes have more features and are less language-specific. Others argue that using language-specific features makes code more readable (for example, using int (C#) or Integer System.Int32 ). (VB.NET) instead of In VB 2008, the inclusion of "Byval sender as Object, Byval e as EventArgs" has become optional. The following example demonstrates a difference between VB6 and VB.NET. Both examples close the active window. Classic VB Example: Sub cmdClose_Click() Unload Me End Sub A VB.NET example: Sub btnClose_Click ( ByVal sender As Object , ByVal e As EventArgs ) Handles btnClose. Click Me . Close ( ) End Sub Note the 'cmd' prefix being replaced with the 'btn' prefix, conforming to the new convention previously mentioned. Visual Basic 6 did not provide common operator shortcuts. The following are equivalent: VB6 Example: Sub Timer1_Timer() Me.Height = Me.Height - 1 End Sub VB.NET example: Sub Timer1_Tick ( ByVal sender As Object , ByVal e As EventArgs ) Handles Timer1. Tick Me . Height -= 1 End Sub In ccnp exam questions , there are a lot of question made in that paper; VB.Net is excellent language for applications; Thanks

renu yadav · Answer

thanks for your response..but this does not work in my case.I have developed a application in visual basic which dynamically generates pdf files.but i have now upgraded the application to vb.net.that is why i am getting the problems...i have provided the problamatic lines of code..if u can help i can provide u with the complete code..

Praveen Kumar · Answer

Try this Article http://www.c-sharpcorner.com/UploadFile/psingh/PDFFileGenerator12062005235236PM/PDFFileGenerator.aspx

pdf files in vb.net

Answers (3)