VS 2008 - How To Convert Image To Base64
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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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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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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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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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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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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Sep 12, 2009
I want to convert an image file into text and then text to image.
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Jul 17, 2010
My project theme is "JPG image will contains text", i need to pick text only from JPG image. Is there any possibility to do this application using VB.Net.
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Feb 3, 2010
i'm trying to convert an image into bytes in vb.net but i failed, i searched the web and threads over here, but seems that i couldn't find any working example or code.
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Jan 16, 2011
I have a program that was created in VB6. I converted it to vb 2008. In the program there is a picture box that is pretty small. I had a command that would resize the picture box after importing an image. It no longer works.
[Code]....
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Jan 29, 2010
I have created a form in Visual Basic with two buttons, a PictureBox and a TextBox. I made the first button to load an image from my hard disk and show it in the PictureBox.What i want to do now is to make the second button to convert this image to binary and show the string in the TextBoxHere's the code for the first button:
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Mar 6, 2009
i've created a new access 2007 database + added a OLE Object field, that i've then pasted images into.
in vb2008 i've connected to the database + put the table into a datatable. so far it works ok.
when i try to convert the byte array to an image, it causes an error:
'A first chance exception of type 'System.ArgumentException' occurred in System.Drawing.dll'
heres the code i'm using:
vb
Dim arr() As Byte = DirectCast(record.Item(5), Byte())
pic.Image = Image.FromStream(New IO.MemoryStream(arr))
its loading the byte array properly, but the Image.FromStream line causes the error. i've used this method before with an earlier access database + it works.
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Jun 28, 2011
i've entered image path from vb.net to oledb but can't convert it as an image to thedatagridview column.
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Apr 28, 2010
The coding below is to retrieve the Raw Image Data from the Database and then write as a JPG image file. The problem is the image file (image.jpg) is "nothing" after file created. I guess there is something wrong in the following coding.
fs.Write(rawData, 0, fileSize)
No any runtime errors I can find, and I double check rawData (i.e. Buffer) contains data. But don't know why there is "nothing" inside the image (image.jpg).
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim fileSize As Integer
Dim rawData() As Byte
[code]....
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Sep 6, 2009
How do you convert a System.Drawing.Bitmap image to any other type of image? I tried CType, which failed, since I do not know the type for .png or .jpg. I cannot find it anywhere on google either.What is the most efficient method to do this, which keeps the quality of the image as high as possible?
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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 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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May 23, 2012
I have a black & white image (find below)I want to print that image by clearing the background(i.e black dots in the form of rectagle)If i print the below bank check it is printing completly black (unable to read the content). Pls do the needful. Many Thanks
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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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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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Aug 14, 2011
I'd like to verify if an image control has an image loaded . If it does , I want to unload that image (and load no image) , but if the image control has no image loaded , I want to load an image . Is it possible ?
If ImageMY.Image.Equals(Nothing) Then
ImageMY.Image = System.Drawing.Image.FromFile("C:ImageBlaBlaBla.jpg")
Else
[code].....
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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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Feb 16, 2011
The following is the code i m using to convert doc file to image.this works well for a file that contains only one page but if there are more than one page in doc file then it converts only first page of file to image.Can some one suggest me how to convert all pages of doc file to seperate images.
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim objWord As New Microsoft.Office.Interop.Word.Application
[code].....
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Feb 9, 2010
Is there any way to convert image(jpg) files to pdf in VB .net ???
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Jul 11, 2009
I'm working on a blackjack card game but i can't convert the resulting string into an image.
Imports BlackJackLib.Class1
Public Class Form1
Dim oBlackJackLib As New BlackJackLib.Class1
[Code]....
Also is there an easier way to check for a card that is dealt twice?
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Feb 14, 2012
how to convert an image into an icon? Is that possible with any image type? I read about image editor which also helps. Where does one get or download this?
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Dec 14, 2009
i have table that has column of type "Image" in my DB. in BLL datarow[5] will fetch Image in that column. according to intellissense this returns an object. In my BLL i've assigned this to class member image of type object. then i return an object of the class .
In my front end i have a DataGridView control i'v asigned the return object from the BLL to DataGridView control. In the Image column it display as System,.Byte[ ]... how can i make the DataGridView control display this image?
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Jan 8, 2011
I need to convert any file (word, excel, pdf...) to an image (jpg/tiff..).Because I intend to preview the content of the first page of the file/document in a small frame (small window).
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Feb 10, 2009
How can we convert any image to any other format e.g BMP to Jpg or emf.I am able to convert only bmp to some of these format by using this code which i found.
[Codie].....
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