Erweiterung von Kurt Jungs gopdf, das leider nicht weiterentwickelt wird https://github.com/jung-kurt/gofpdf
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package gofpdi
import (
"bytes"
"github.com/jung-kurt/gofpdf"
"github.com/jung-kurt/gofpdf/internal/example"
"io"
"sync"
"testing"
)
func ExampleNewImporter() {
// create new pdf
pdf := gofpdf.New("P", "pt", "A4", "")
// for testing purposes, get an arbitrary template pdf as stream
rs, _ := getTemplatePdf()
// create a new Importer instance
imp := NewImporter()
// import first page and determine page sizes
tpl := imp.ImportPageFromStream(pdf, &rs, 1, "/MediaBox")
pageSizes := imp.GetPageSizes()
nrPages := len(imp.GetPageSizes())
// add all pages from template pdf
for i := 1; i <= nrPages; i++ {
pdf.AddPage()
if i > 1 {
tpl = imp.ImportPageFromStream(pdf, &rs, i, "/MediaBox")
}
imp.UseImportedTemplate(pdf, tpl, 0, 0, pageSizes[i]["/MediaBox"]["w"], pageSizes[i]["/MediaBox"]["h"])
}
// output
fileStr := example.Filename("contrib_gofpdi_Importer")
err := pdf.OutputFileAndClose(fileStr)
example.Summary(err, fileStr)
// Output:
// Successfully generated ../../pdf/contrib_gofpdi_Importer.pdf
}
func TestGofpdiConcurrent(t *testing.T) {
wg := sync.WaitGroup{}
for i := 0; i < 100; i++ {
wg.Add(1)
go func() {
defer wg.Done()
pdf := gofpdf.New("P", "mm", "A4", "")
pdf.AddPage()
rs, _ := getTemplatePdf()
imp := NewImporter()
tpl := imp.ImportPageFromStream(pdf, &rs, 1, "/MediaBox")
imp.UseImportedTemplate(pdf, tpl, 0, 0, 210.0, 297.0)
// write to bytes buffer
buf := bytes.Buffer{}
if err := pdf.Output(&buf); err != nil {
t.Fail()
}
}()
}
wg.Wait()
}
func getTemplatePdf() (io.ReadSeeker, error) {
tpdf := gofpdf.New("P", "pt", "A4", "")
tpdf.AddPage()
tpdf.SetFont("Arial", "", 12)
tpdf.Text(20, 20, "Example Page 1")
tpdf.AddPage()
tpdf.Text(20, 20, "Example Page 2")
tbuf := bytes.Buffer{}
err := tpdf.Output(&tbuf)
return bytes.NewReader(tbuf.Bytes()), err
}