NewSurfaceFromC issue

[gen2brain]

I am trying to use https://github.com/cheggaaa/go-poppler to extract images from pdf, but I am getting this during build: 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

Do you have and idea how it can be fixed? I also filled issue there https://github.com/cheggaaa/go-poppler/issues/1 .

[gen2brain]

I think this may be related https://github.com/golang/go/issues/7958#issuecomment-66094578

[gen2brain]

I fixed it like this:

diff -ur go-cairo.orig/surface.go go-cairo/surface.go
--- go-cairo.orig/surface.go    2015-10-16 03:31:51.000000000 +0200
+++ go-cairo/surface.go 2015-10-15 18:49:33.000000000 +0200
@@ -16,10 +16,13 @@
    "github.com/ungerik/go-cairo/extimage"
 )

+type Cairo_surface *C.cairo_surface_t
+type Cairo_context *C.cairo_t
+
 // Golang struct to hold both a cairo surface and a cairo context
 type Surface struct {
-   surface *C.cairo_surface_t
-   context *C.cairo_t
+   surface Cairo_surface
+   context Cairo_context
 }

 func NewSurface(format Format, width, height int) *Surface {
@@ -30,7 +33,7 @@
 // NewSurfaceFromC creates a new surface from C data types.
 // This is useful, if you already obtained a surface by
 // using a C library, for example an XCB surface.
-func NewSurfaceFromC(s *C.cairo_surface_t, c *C.cairo_t) *Surface {
+func NewSurfaceFromC(s Cairo_surface, c Cairo_context) *Surface {
    return &Surface{surface: s, context: c}
 }

And then I called it in go-poppler like this:

return cairo.NewSurfaceFromC((cairo.Cairo_surface)(unsafe.Pointer(ci)), (cairo.Cairo_context)(unsafe.Pointer(ctx)))