Inflating A Base64 String: Zlib Error: 3
Feb 8, 2012
My app receives a PDF as a base64, zLib deflated string in an xml file. At least that's the format I'm told it is in. It gets stored in a database, then I need to recreate the PDF from that string. I created a test app to figure it out. The function below takes the string and is supposed to return it in a decoded, inflated format which I believe I'll be able to use to rebuild the original PDF (I'm not there yet). I've done lots of research and found a few different libraries and ways to do this as well as received a java program from the developer who is sending me the PDF to use as an example. However I can not get the string to a usable format. Using the ManagedZLib.dll and the function below seems to get me the closest. As far as I can tell from debugging, everything works until I try to decompress:
zStream.Read(decompressedBytes, 0, decodedBytes.Length - 1)
This produces a "zLib error: -3". The only info I can find on that error is it is a 'data error'. There is very little other information on the web about it.
Public Function DecompressString4(ByVal origString As String) As String
Dim returnString = Nothing
' get the base64 content into String
ManagedZLib.ManagedZLib.Initialize()
[code]....
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May 8, 2012
So I've been going around the internet looking for a way to convert regular text(string) into base64 string and found many solutions. I'm trying to use:
Dim byt As Byte() = System.Text.Encoding.UTF8.GetBytes(TextBox1.Text)
TextBox2.Text = convert.ToBase64String(byt)
but it end up with an error saying
'ToBase64String' is not a member of 'System.Windows.Forms.Timer'.
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Jul 20, 2011
I am trying to convert a TIFF image to a base 64 string.I have seen so much code on the internet like the one below, but I don't understand it .I dont know what to change so it converts my image(s).I want the outcome (the bytes) as a variable that I can use outside this function. Know how to do that?
Private Function BytesToImage(ByVal ImageBytes() As Byte) As Image
Dim imgNew As Image
Dim memImage As New System.IO.MemoryStream(ImageBytes)[code]..........
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Jan 25, 2011
I have been having some problems trying to decrypt the string returned back from SagePay.I used their asp.net kit which included the encrypt and decrypt functions using base64 - sending the information to SagePay is not a problem but I am having a number of problems trying to descrypt the string.Here is the function I am using to descypt:
Private Function base64Decode(ByVal strEncoded As String) As String
Dim iRealLength As Integer
Dim strReturn As String
Dim iBy4 As Integer
[code]....
I don't think the web server is trying to encode anything as there are no + symbols within the url string and I have just glanced over the two to compair they are the same.This returns a blank string whereas when I use the sections commented out in the first loop i get a really weired string back and when I use their simpleXor function it just returns complete nonsense.
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Jun 16, 2009
I've been working on this challenge for a while now without much luck. What I'm attempting to do is split a MIME byte response into its individual images. I am given the boundary to split on in the HTTP header but when I attempt the following code it doesnt work.
'boundary to split on
Dim boundary as string = _
"boundarystring"
[Code]....
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Mar 12, 2011
I would like help to compress a file with zlib. I have have searched google for ages and found losts of examples but i can't get any to work in VB 2008 Express. I am also not sure which version of the dll to use as there seems to be a few for VB.Can someone post some code that will work in VB 2008 so i can see how to do it and also a link to the dll that you used.
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Dec 3, 2009
I need to Base64 encode a string, but the encoded string cannot contain "+". Wikipedia mentions a modified Base64 for URL, but I can't find a .NET class which uses this.For my application, I can't even URL encode "+" into "%2B". This is because I pass the encoded string to a service which I have no control over, and that service mangles any strings which contain "%2B". For this reason, I want my encoded string to only contain A-Z, a-z, 0-9, -, and _.
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Mar 24, 2012
I would like to decompress/compress text files in zlib format.
Here's what I tried:
- Downloaded zlibwipa.dll from [URL] and tried to add a reference to it but got an error saying it is an invalid assembly.
- Downloaded DotZLib from [URL] but can't get it to work, error message: Unable to load DLL 'zlib.DLL': The specified module could not be found. (Exception from HRESULT: 0x8007007E)
- Looked at this [URL] but couldn't do much with it
This files are textfiles created from flash with ActionScript 3.0, but compressed, using the ByteArray class's compress() method. I know Flash uses zlib algorithm for this, and I would like to open and use this file from vb.net.
I am using something like :
FileOpen(1, OpenMapDialog.FileName, OpenMode.Binary, OpenAccess.ReadWrite)
Dim a() As Byte = {}
FileGet(1, a)
[Code]....
How do I decompress a zlib compressed file with byte arrays?
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Mar 11, 2010
url...we get the encoded as alphapet base64..i want to talk as low level programming what will happen or this data how it will represent as binary and send it is it encoded again as ascii to binary or there is another idea.
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Apr 20, 2012
I am writing a little project to parse a CSS file, and base64 encode all the background images.While I am able to parse the CSS correctly, it seems that everytime I try to convert the image file into a base64Encoded string, the string returned is always exactly the same.Please assume that all image paths are passing correctly to the method. In this instance, all images are fully qualified urls, so the first section of the method is what is doing the conversion.[code]
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Dec 28, 2010
I'm trying to convert standard bytes like so:
00DEAD00BEEF0000
and convert it to base64.
I want it to go from bytes -> Base64.
Not
String -> Base64.
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Jul 29, 2010
Question: In order to store logos in a database and display them dynamically in ms-reporting service, I need to base64 encode the image. It doesn't work with binary saved images, due to MS limitations...
Now my question: Which datatype do I use? Varchar, nvarchar or text? I guess varchar would be good enough, since base64 encoded, but images might be larger than 4000 characters...
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Dec 6, 2011
I need to call a web service from .Net and the web service is authenticted through Base64 authentication.I tried with Web service proxy and it is failed.
[code]....
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Jul 13, 2010
I have some problems with converting the Image to Base64.
Functions:
Public Function ImageToString(ByVal im As Image) As String
Dim ms As New MemoryStream()
Dim.Save(ms, im.RawFormat)
Dim array As Byte() = ms.ToArray()
Return Convert.ToBase64String(array)
[Code] .....
I use this code for converting it:
StringToImage("Some Picture...")
But when I try to do the ImageToString, I need to enter something like this:
ImageToString(imageString)
How can I get that imageString?
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Dec 19, 2011
I have come across some Base64 conversion functions in .net(FromBase64.string etc). What i want is, for a sample, i have a base 64 encoded string as
"48YwojCi4yaiow==".
I need to convert this string to the corresponding Hexadecimal text(The sample stands for "Thisistest" in hex text) The below link is an online converter from base64 to hexadecimal text. If you give the same base64 encoded data in the link , click on convert, the one that is seen below "Hexadecimal text" is what I need.
[URL]
Is there a standard library function in vb.net which does this? Converting a base 64 data to a hexadecimal text?
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Mar 11, 2010
my code is :
[Code]...
The error is Value of type '1-dimensional array of string' cannot be converted to 'String'.
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Jan 17, 2010
I don't understand why the line final.join etc pops up with these errors!! Value of type 'String' cannot be converted to '1-dimensional array of String' And Access of shared member, constant member, enum member or nested type through an instance; qualifying expression will not be evaluated This is my code.
[Code]...
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Jan 15, 2010
I need to do this to every line in a file and save the # five Element in an array. I keep getting (error code 1 Value of type '1-dimensional array of String' cannot be converted to 'String'.)
NOTE: if I change ( Dim Lineoftext(1) to Dim Lineoftextt works) (It does't seem to work with arrays)
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[CODE]....
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Aug 5, 2011
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click Roles.AddUsersToRole(DropDownList1.SelectedValue, DropDownList2.SelectedValue) Label1.Text = DropDownList1.SelectedValue + "Was Add to the" + DropDownList2.SelectedValue + "Role"
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Apr 11, 2011
Background: I have a winForm app that registers a user in the database based on the information provided, auto-generates a random password and username, and e-mails the user a link to take an application based on the marketing company selected. Problem: hen the user clicks "Send Invitation" with data inputted iton all fields except the bundles listbox in debug, the NullReferenceException Error is thrown highlighting the line: Dim MCShort As String = Trim(splitMC(0))How do I fix this issue Here's a screenshot of the web app: Here's the code of the Send_Button_Click method off default.asx.vb:
Private Sub Send_Button_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Send_Button.Click
'TODO Add code to validate that all selections that are reaquired are met.
[code].....
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Jul 4, 2011
I make a query in coding. But I got conversion error.My query is below
Dim strSelect As String = ""
strSelect = "SELECT " & _
"Description As [Desc], " & _
[code].....
Exception error is like
Conversion from string "iif(CurCons = 0, " to type 'Double' is not valid
Actually, in my report, i wanna show if it's zero then '-'. If i set it in this string.I got another error like below The provider could not determine the Decimal value. For example, the row was just created, the default for the Decimal column was not available, and the consumer had not yet set a new Decimal value.
From da.Fill
Dim cmd As New OleDbCommand(strDynamic, m_DBConn)
Dim da As New OleDbDataAdapter(cmd)
da.Fill(ds, "tblCur")
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Feb 23, 2011
I am not the one who developed this tool, it's the previous programmer and they gave the project to me to update it however, when I try to run the application in my local computer I am getting this error: Argument not specified for parameter 'XLSFile' of 'Public Sub New(XMLFile As String, XLSFile As String)'.
The error points to the code below in bold letter:
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
Zym.ConnectionString = Web.Configuration.WebConfigurationManager.ConnectionStrings("cnworkload").ConnectionString
'Dim cn As System.Data.SqlClient.SqlConnection = New System.Data.SqlClient.SqlConnection(Zym.ConnectionString)
'Dim DA As New System.Data.SqlClient.SqlDataAdapter("SELECT * FROM SUMMARY_WORKLOAD", cn)
[code].....
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Sep 14, 2011
var queryString = string.Format("filename={0}&filestream={1}&append={2)", fileName, Convert.ToBase64String(b, 0, bytesRead).ToString(), 1);
above line of code giving error 'Input string was not in a correct format.'
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May 7, 2009
I keep getting sql string errors when I try to add records to an access database[code]...
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May 1, 2011
i want to connect a database to my project but i am getting an error on this line
"Data Source=.SQLEXPRESS;
AttachDbFilename="c:userscjdocumentsvisual
studio
[code].....
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Jun 4, 2012
This is my connection string when Im trying to install in other computer i have an error.[code]...
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Apr 9, 2009
symbol is put into my code, it is meant to be decoded as a /And when I put a % symbol into my code, it is meant to be decoded as a :I am using regex to do thisHere is my code to decode the coded adress (no pun intended):
Dim info As IO.FileInfo
Try
Dim SelectedLstItem As String
[code].....
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Aug 13, 2009
I created an application in vb.net 2005.It works fine on my machine. I tested several different test machines and all were working fine. As for the client, it's generating an error. My application reads from an excel sheet and imports the values to an oracle database. the error being generated is: "conversion from type string to type double is not valid". Why is it generating on on the client's computer and not mine?
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Nov 1, 2010
i'm trying to tokenize my text but while doing that i'm facing a problem
would anyone like to solve it
Public Function lexemes(ByVal str As String, ByVal seps As String) As String
Dim regexpression As String
regexpression = Regex.Split(str, seps)
Return regexpression
End Function
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Jan 21, 2009
i'm trying to tokenize my text but while doing that i'm facing a problem
Public Function lexemes(ByVal str As String, ByVal seps As String) As String
Dim regexpression As String
regexpression = Regex.Split(str, seps)
Return regexpression
End Function
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