3/1/2023 0 Comments Base64 decode image![]() This command will read in the Document1.txt file and output the decoded PDF file to decoded1.pdf.$ base64 -decode ~/Dropbox/linux_stuff/Document1.txt > ~/Dropbox/linux_stuff/decoded1.pdf Run the base64 decode command (base64 is part of the coreutils package),.Open a Linux command line terminal window.Copy the docuemnt1.txt file to your Linux computer (you could use Dropbox for this).Save the new TextPad to a file, for example, document1.txt.Copy/paste the string into a new TextPad window.Select the string up to but do not include the quote " symbol.Do not include subsequent fields after it.Make sure you select it all the way to the end – but do not include subsequent fields after it. Go to a specific row in the data and select and copy the cell field string that contains the PDF Base64 encoded data. TextPad can handle the large data and respects any newlines characters, etc., when you open the file and also when you copy/paste the data.Ĥ. Don’t use Notepad because it cannot handle the large size data and truncates it.ģ. Use text editor, TextPad to open the csv file. Use Dataloader and export the QuoteDocument object with all fields and dataĢ.Of course, the Base64 encoding classes are found in the System.How to export the Salesforce Quote PDF file and read convert it from Base64 back to PDF using Linux command Line For this demo, I included the following units in my project file so that I can use JPEG and PNG: program prjImageToBase64 The stream then is loaded into the TPicture property.Īgain, be aware that this works for PNG, JPEG, … or whatever file format you include in your binary. Otherwise, we load the text into the memo, save its contents to a stream and then decode that stream. Instead of Encode, we call Decode for the Base64 class, of course. The other direction works just the same way: procedure TFrmMain.btnLoadTextClick(Sender: TObject) The memo then loads the data from the stream to display it. The Base64 algorithm does not care for the input as long as it is a TStream . Key is to save the picture to the stream. Of course, we could use a TPicture object that we create ourselves as well to make the method independent of our GUI. We use the TPicture property of the TImage component on the form. ![]() ![]() load image into image component (TPicture) Here’s the source code for encoding the image file: procedure TFrmMain.btnLoadImageClick(Sender: TObject) The two buttons will either load an image and generate the Base64 encoded text in the memo or load a Base64 text and show the decoded image. It looks nicer, but can also be replaced with a standard TMemo in this case. I used a TAdvMemo from TMS Software as it shows line numbers and a gutter. Let’s build a VCL Form application with the following main form: Still, it is possible to display the image after decoding as the VCL is pretty smart □ Obviously, we do not interpret the file format at any time. In order to encode images, one has to write the image data as binary. The solution I present here will allow you to encode any binary data as Base64. At that moment you become set on bitmaps. Developers often make the mistake to use TBitmap . The key lies in the polymorphism of TPicture that allows you to implement a solution that is not even depending on one file format. However, I have received a question multiple times and want to provide the solution: How can images be encoded and decoded? The post is still accessed on a regular basis. Quite some time ago, I blogged about how to encode and decode data as Base64.
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