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* Watermark examples. * Simplified pdf_watermark_image.go * Updated unipdf version. * updated README.md
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,81 @@ | ||
| /* | ||
| * Remove watermark image to each page of a PDF file. | ||
| * | ||
| * Run as: go run pdf_remove_watermark_image.go input.pdf output.pdf | ||
| */ | ||
|
|
||
| package main | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "os" | ||
|
|
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| "github.com/unidoc/unipdf/v3/common/license" | ||
| "github.com/unidoc/unipdf/v3/model" | ||
| ) | ||
|
|
||
| func init() { | ||
| // Make sure to load your metered License API key prior to using the library. | ||
| // If you need a key, you can sign up and create a free one at https://cloud.unidoc.io | ||
| err := license.SetMeteredKey(os.Getenv(`UNIDOC_LICENSE_API_KEY`)) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| } | ||
|
|
||
| func main() { | ||
| if len(os.Args) < 3 { | ||
| fmt.Printf("go run pdf_remove_watermark_image.go input.pdf output.pdf\n") | ||
| os.Exit(1) | ||
| } | ||
|
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| inputPath := os.Args[1] | ||
| outputPath := os.Args[2] | ||
|
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| pdfReader, f, err := model.NewPdfReaderFromFile(inputPath, nil) | ||
| if err != nil { | ||
| fmt.Printf("Error: %v\n", err) | ||
| os.Exit(1) | ||
| } | ||
| defer f.Close() | ||
|
|
||
| numPages, err := pdfReader.GetNumPages() | ||
| if err != nil { | ||
| fmt.Printf("Error: %v\n", err) | ||
| os.Exit(1) | ||
| } | ||
|
|
||
| for i := 0; i < numPages; i++ { | ||
| pageNum := i + 1 | ||
|
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| // Read the page. | ||
| page, err := pdfReader.GetPage(pageNum) | ||
| if err != nil { | ||
| fmt.Printf("Error: %v\n", err) | ||
| os.Exit(1) | ||
| } | ||
|
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| // For watermarks applied by Adobe, just pass nil as argument. | ||
| // For custom watermarks use pdf_list_images.go to figure out the name of watermark object. | ||
| err = page.RemoveWatermarkImage("Img1") | ||
| if err != nil { | ||
| fmt.Printf("Error: %v\n", err) | ||
| os.Exit(1) | ||
| } | ||
| } | ||
|
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| // Generate a PDFWriter from PDFReader. | ||
| pdfWriter, err := pdfReader.ToWriter(nil) | ||
| if err != nil { | ||
| fmt.Printf("Error: %v\n", err) | ||
| os.Exit(1) | ||
| } | ||
|
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| err = pdfWriter.WriteToFile(outputPath) | ||
| if err != nil { | ||
| fmt.Printf("Error: %v\n", err) | ||
| os.Exit(1) | ||
| } | ||
|
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| fmt.Printf("Complete, see output file: %s\n", outputPath) | ||
| } |
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