Go wrapper for a Poppler PDF rendering library
License: GNU General Public License v2.0
I would like to use go-poppler in one of my projects, but it doesn't have a license. Might I suggest the MIT license?
Lack of a license, also prevents pkg.go.dev from displaying the package documentation as seen here.
golang/src/github.com/cheggaaa/go-poppler/document.go:22: cannot use d.doc (type poppDoc) as type *C.struct__PopplerDocument in argument to _Cfunc_poppler_document_get_pdf_version_string
golang/src/github.com/cheggaaa/go-poppler/document.go:23: cannot use d.doc (type poppDoc) as type *C.struct__PopplerDocument in argument to _Cfunc_poppler_document_get_title
golang/src/github.com/cheggaaa/go-poppler/document.go:24: cannot use d.doc (type poppDoc) as type *C.struct__PopplerDocument in argument to _Cfunc_poppler_document_get_author
...
I changed code like this:
diff -ur go-poppler.orig/image.go go-poppler/image.go
--- go-poppler.orig/image.go 2015-10-15 17:26:17.000000000 +0200
+++ go-poppler/image.go 2015-10-15 17:27:27.565100316 +0200
@@ -11,7 +11,7 @@
type Image struct {
Id int
Area Rectangle
- p poppDoc
+ p poppPage
}
type Rectangle struct {
diff -ur go-poppler.orig/page.go go-poppler/page.go
--- go-poppler.orig/page.go 2015-10-15 17:26:17.000000000 +0200
+++ go-poppler/page.go 2015-10-15 17:27:06.805461872 +0200
@@ -8,7 +8,7 @@
//import "fmt"
type Page struct {
- p poppDoc
+ p poppPage
}
func (p *Page) Text() string {
diff -ur go-poppler.orig/poppler.go go-poppler/poppler.go
--- go-poppler.orig/poppler.go 2015-10-15 17:26:17.000000000 +0200
+++ go-poppler/poppler.go 2015-10-15 17:26:49.165219888 +0200
@@ -12,7 +12,8 @@
"path/filepath"
)
-type poppDoc *[0]byte
+type poppDoc *C.struct__PopplerDocument
+type poppPage *C.struct__PopplerPage
func Open(filename string) (doc *Document, err error) {
filename, err = filepath.Abs(filename)
But now I am getting this:
golang/src/github.com/cheggaaa/go-poppler/image.go:24: cannot use ci (type *C.struct__cairo_surface) as type *cairo.C.struct__cairo_surface in argument to cairo.NewSurfaceFromC
golang/src/github.com/cheggaaa/go-poppler/image.go:24: cannot use ctx (type *C.struct__cairo) as type *cairo.C.struct__cairo in argument to cairo.NewSurfaceFromC
It is the same type but with cairo. in front. Do you have an idea why and can it be cast? I use poppler-0.35.0 and cairo-1.14.2.
提供一个可以转出图片的函数，但是转出来的图片会模糊，暂时不知道怎么解决
func (p *Page) Convert2Image() image.Image {
// Render the PDF file
width, height := p.Size()
surface := cairo.NewSurface(cairo.FORMAT_ARGB32, int(width), int(height))
pattern := cairo.NewPatternForSurface(surface)
pattern.SetFilter(cairo.CAIRO_FILTER_NEAREST)
defer pattern.Destroy()
_, drawcontext := surface.Native()
surface.SetSource(pattern)
C.poppler_page_render_for_printing(p.p, (*C.cairo_t)(unsafe.Pointer(drawcontext)))
defer surface.Finish()
return surface.GetImage()
}Hi there, first I want to say thank you for writing this wrapper 👍
My file descriptor limit is 256 and this code will generate error on 252nd loop (i == 251)
for i := 0; i < 300; i++ {
fmt.Println(i)
doc, _ := poppler.Open("file.pdf")
doc.GetPage(0)
}
Error log:
(process:30447): Poppler-CRITICAL **: 19:37:52.120: int poppler_document_get_n_pages(PopplerDocument *): assertion 'POPPLER_IS_DOCUMENT (document)' failed
OS: macOS Catalina 10.15.4
Per golang/go#23749 (comment), cflags-only-I is no longer a whitelisted cgo option for the Go compiler, hence I was not able to build using go get. I set the environment variable as indicated as a temporary fix, but I'm not familiar enough with the flags and how you're using them to propose a permanent fix. If you could look into it for future users of your library, I'm sure folks would appreciate that. Thanks!
привет. я не нашел в твоей документации примеров как конвертировать целый пдф в несколько изображений. хотя сам poppler это умеет. это можно сделать с использованием твоей обертки?
In poppler it has "pdfseparate"
you can run something like:
pdfseparate main_pdf.pdf pdf_page_%d.pdf
This gives you pdf_page_1.pdf ..2..3.. etc
Or alternatively writing a page, right now you can grab a pdffile like:
pdf, err := poppler.Open("file.pdf");
pageCount := pdf.GetNPages();
for i := 0; i < pageCount; i++ {
pdfPage := pdf.GetPage(i);
//write pdfPage to a file?
}
above could allow you to write specific pages if you had an if statement searching for some text() or something as well..
Is there a way to do this? Thank you
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