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Go: How to split or truncate a large PDF file with QPDF
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package main | |
import ( | |
"fmt" | |
"io" | |
"io/ioutil" | |
"log" | |
"os" | |
"os/exec" | |
) | |
func main() { | |
r, err := os.Open("big.pdf") | |
if err != nil { | |
log.Fatal(err) | |
} | |
defer r.Close() | |
w, err := os.Create("small.pdf") | |
if err != nil { | |
log.Fatal(err) | |
} | |
err = TruncatePdf(w, r, 300) | |
if err != nil { | |
log.Fatal(err) | |
} | |
err = w.Close() | |
if err != nil { | |
log.Fatal(err) | |
} | |
} | |
func TruncatePdf(w io.Writer, r io.Reader, numPages int) error { | |
input, err := ioutil.TempFile("", "input-*.pdf") | |
if err != nil { | |
log.Fatal(err) | |
} | |
defer os.Remove(input.Name()) | |
_, err = io.Copy(input, r) | |
if err != nil { | |
return err | |
} | |
err = input.Sync() | |
if err != nil { | |
return err | |
} | |
output, err := ioutil.TempFile("", "output-*.pdf") | |
if err != nil { | |
return err | |
} | |
defer os.Remove(output.Name()) | |
cmd := exec.Command("qpdf", input.Name(), "--pages", ".", fmt.Sprintf("1-%d", numPages), "--", output.Name()) | |
out, err := cmd.CombinedOutput() | |
if err != nil { | |
log.Print(string(out)) | |
return err | |
} | |
_, err = io.Copy(w, output) | |
return err | |
} |
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