How to Automatically Upload PDF to Your Server After Printing with a PDF Virtual Printer SDK
Many developers need more than just a Print to PDF feature.
They want to print a document, create a PDF automatically, upload the PDF to their server, and continue processing without asking the user to do anything.
Most PDF printers stop after creating the PDF.
A PDF Virtual Printer SDK can do much more. It can automatically start your own application after the PDF is created, making it easy to upload the PDF, call your REST API, archive documents, send faxes, run OCR, or trigger any custom workflow.
This article explains how to test this workflow before writing any Delphi code and how your own application fits into the process.
Common Problems Developers Want to Solve
Many software developers are looking for solutions like these.
| Problem | Solution |
|---|---|
| Print to PDF and upload to server automatically | PDF Virtual Printer SDK + RunEXE |
| Send PDF to a REST API after printing | Your own application |
| Automatically archive printed documents | Custom post-processing |
| Send printed PDF to a cloud service | Your upload program |
| Encrypt or sign PDF after printing | Automatic post-processing |
| Delete temporary PDF after upload | Your application |
These are common requirements for:
- Document Management Systems (DMS)
- Fax Server Software
- Medical Software
- Accounting Systems
- ERP Applications
- CRM Software
- Cloud Document Platforms
How the Automatic PDF Workflow Works
Instead of asking users to save a PDF manually, the entire process can run automatically.
Print Any Document
│
▼
PDF Virtual Printer
│
▼
Generate PDF
│
▼
Run Your Application
│
▼
Upload PDF to Server
│
▼
Delete Temporary PDFThe user only clicks Print.
Everything else happens automatically.
Test the Complete Workflow Without Delphi Code
Many developers think they need a Delphi sample project before evaluating a PDF Virtual Printer SDK.
Actually, you don't.
You can verify almost the entire workflow by changing only two lines in config.ini.
RunEXE-ShowWindow=0
RunEXE=<%APPFOLDER%\bin\RunAsUser.exe> <%WINDOWSDIR%\notepad.exe> <%FULL_FILENAME%>Now print any document to the virtual printer.
After the PDF is created:
- The virtual printer starts Notepad.
- The generated PDF filename is passed as a command-line parameter.
- You can verify that the post-processing workflow works correctly.
No Delphi code is required for this test.
Why Use Notepad?
Some developers ask why Notepad is used.
Notepad is only a simple test program.
Its purpose is to prove that:
- The PDF is created successfully.
- The PDF filename is passed correctly.
- Another application can be started automatically.
- The workflow is working.
Once this test succeeds, your own application can replace Notepad.
Replace Notepad with Your Delphi Application
After purchasing the SDK, simply replace Notepad with your own Delphi application.
For example:
RunEXE-ShowWindow=0
RunEXE=<%APPFOLDER%\MyDelphiApp.exe> <%FULL_FILENAME%>Now the workflow becomes:
Print
│
▼
Create PDF
│
▼
Start MyDelphiApp.exe
│
▼
Read PDF
│
▼
Upload to Server
│
▼
Delete PDFThis is the same workflow used by many commercial document management systems.
Reading the PDF in Delphi
Your Delphi application receives the PDF filename from the command line.
For example:
var
PDFFile: string;
begin
PDFFile := ParamStr(1);Your application can then:
- Open the PDF
- Load it into a MemoryStream
- Upload it using your own REST API
- Delete the temporary PDF
The SDK does not limit what your application can do.
Example Workflow
A typical Delphi application performs these steps.
| Step | Action |
|---|---|
| Receive PDF filename | ParamStr(1) |
| Load PDF | TMemoryStream.LoadFromFile() |
| Upload PDF | HTTP POST |
| Wait for server response | Success or failure |
| Delete temporary PDF | DeleteFile() |
The upload API can be:
- REST API
- HTTP API
- HTTPS API
- SOAP Web Service
- Cloud Storage API
- Your own custom protocol
Why Most PDF Printers Cannot Upload PDFs Automatically
Many desktop PDF printers only create PDF files.
They cannot:
- Upload PDFs automatically
- Call your REST API
- Start your application
- Process PDFs after printing
- Build an automated workflow
A PDF Virtual Printer SDK solves this problem by allowing your own application to run immediately after the PDF is created.
This gives you complete control over the next step.
Why Is the PDF Saved to Disk First?
Some developers ask if the PDF can stay entirely in memory.
Unfortunately, Windows printing does not work that way.
The Windows printing system always creates temporary spool files during printing.
This is part of the Windows print architecture, not a limitation of the SDK.
The normal workflow is:
- Windows receives the print job.
- The virtual printer creates the PDF.
- Your application reads the PDF.
- The PDF is uploaded.
- The temporary file is deleted.
This workflow is used by many commercial Windows applications.
Real Business Examples
Different industries use this workflow in different ways.
| Industry | Automatic Workflow |
|---|---|
| Healthcare | Print → PDF → Upload to EMR |
| Legal | Print → PDF → Archive |
| Accounting | Print → PDF → ERP System |
| Insurance | Print → PDF → Document Server |
| Manufacturing | Print → PDF → Workflow System |
| Fax Server | Print → PDF → Send by API |
| Government | Print → PDF → Records Management |
Why We Provide Delphi Samples After Purchase
Every customer has a different workflow.
Some customers:
- Upload PDFs
- Send faxes
- Archive documents
- Call REST APIs
- Encrypt PDFs
- Add digital signatures
- Perform OCR
Because every project is different, we prepare a Delphi sample based on your actual requirements after purchase.
This saves development time and gives you a sample that matches your own application instead of a generic demo.
Evaluation vs. Production
| Feature | Evaluation | After Purchase |
|---|---|---|
| Print to PDF | ✔ | ✔ |
| Automatic PDF creation | ✔ | ✔ |
| Run another application | ✔ | ✔ |
| Test with Notepad | ✔ | Optional |
| Use your own Delphi application | Optional | ✔ |
| Upload PDF to server | Optional | ✔ |
| Delphi 10/11 sample | Planned after purchase | ✔ |
| Technical support | ✔ | ✔ |
Frequently Asked Questions
1. Can I test the SDK without Delphi?
Yes. You can verify the complete workflow by launching Notepad or any executable after PDF creation.
2. Can I automatically upload PDFs after printing?
Yes. Your application can upload the generated PDF using your own API.
3. Can the virtual printer call my REST API directly?
The virtual printer starts your application. Your application then calls your REST API.
4. Can I replace Notepad with my own program?
Yes. Simply replace the executable in the RunEXE setting.
5. Can I use Delphi 10 or Delphi 11?
Yes. You can build your application with Delphi 10, Delphi 11, or other Delphi versions.
6. Can I use C#, C++, Python, or Java instead of Delphi?
Yes. The SDK is language independent. Any application that accepts command-line parameters can be used.
7. Can I upload PDFs to AWS, Azure, Google Cloud, or my own server?
Yes. Your application controls the upload process and can connect to any cloud service or server.
8. Can I delete the PDF after uploading?
Yes. This is a common workflow used to reduce disk usage and improve security.
9. Can I encrypt or sign the PDF before uploading?
Yes. Your application can process the PDF before sending it to the server.
10. Why isn't a Delphi sample required for evaluation?
Because the automatic workflow can be tested by launching any executable. This proves that PDF creation and post-processing work correctly.
11. Why is the Delphi sample provided after purchase?
Every customer has different business requirements. We prepare a Delphi sample that matches your actual workflow, making integration faster and easier.
12. What kinds of applications use this PDF Virtual Printer SDK?
It is commonly used in document management systems, fax servers, ERP software, CRM applications, healthcare systems, legal software, workflow automation, and cloud document processing platforms.
Conclusion
If your goal is simply to print to PDF, almost any PDF printer can do that.
If your goal is to automatically upload PDFs to your server, call your API, start your own application, and build a complete document workflow, you need a PDF Virtual Printer SDK that supports post-processing.
The evaluation is simple. Configure RunEXE, print a document, and verify that your application receives the generated PDF. After purchase, you can replace the test program with your own Delphi application and build a fully automated Print to PDF → Upload → Process → Archive workflow.
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