MagickReadImage fails to read any image

Question

I'm using ImageMagick to build a C application. A sample code is:

#include <wand/MagickWand.h>
...
void * readPng(char *filename) {
    MagickWandGenesis();
    MagickWand * pngimgreader;
    pngimgreader = NewMagickWand();
    if (MagickReadImage(pngimgreader, "66666660_EAN-8.png")==MagickFalse) {
        int err = dump_error(pngimgreader);
        return -1;
    }
    return (void *)pngimgreader;
}

I'm always getting MagickFalse. I've tried with several images. The dump_error call says:

ERROR: unable to open image `66666660_EAN-8.png': No such file or directory @ error/blob.c/OpenBlob/2874

or similar message for other images

I'm stuck on that error. Any help is welcome.

Command: pkg-config --list-all | grep MagickWand gives

Wand-6.Q16             MagickWand - MagickWand - C API for ImageMagick (ABI Q16)
MagickWand-6.Q16       MagickWand - MagickWand - C API for ImageMagick (ABI Q16)
Wand                   MagickWand - MagickWand - C API for ImageMagick (ABI Q16)
GraphicsMagickWand     GraphicsMagickWand - GraphicsMagick Wand image processing library
Wand-im6               MagickWand - MagickWand - C API for ImageMagick (ABI Q16)
MagickWand             MagickWand - MagickWand - C API for ImageMagick (ABI Q16)
MagickWand-im6         MagickWand - MagickWand - C API for ImageMagick (ABI Q16)
MagickWand-im6.q16     MagickWand - MagickWand - C API for ImageMagick (ABI Q16)

Try a full, absolute filespec. – Martin James Aug 24 '22 at 01:03 — Martin James, Aug 24 '22 at 01:03

score 0 · Answer 1 · answered Aug 24 '22 at 07:52

0

It was an unexpected change in the working directory defined by my development environment.

answered Aug 24 '22 at 07:52

user10867087

51
4

The 'working directory' concept was designed for interactive, buman users. Do not use it in code. – Martin James Aug 24 '22 at 08:08
Windows has shell API calls to return useful folder specs. – Martin James Aug 24 '22 at 08:14

MagickReadImage fails to read any image

1 Answers1