When I build by build.sh got these errors, could you help me ? thank you !

[wzhsunn]

ocrad.js:54319 Uncaught Error: abort(Assertion failed: you need to wait for the runtime to be ready (e.g. wait for main() to be called)) at Error
    at jsStackTrace (ocrad.js:54516)
    at stackTrace (ocrad.js:54533)
    at abort (ocrad.js:54313)
    at assert (ocrad.js:53378)
    at Module._OCRAD_open (ocrad.js:57469)
    at ccall (ocrad.js:53431)
    at Object.open (ocrad.js:53440)
    at Object._simple (ocrad.js:58053)
    at Function._simple (ocrad.js:58273)
    at OCRAD (ocrad.js:58264)
    at abort (ocrad.js:54319)
    at assert (ocrad.js:53378)
    at Module._OCRAD_open (ocrad.js:57469)
    at ccall (ocrad.js:53431)
    at Object.open (ocrad.js:53440)
    at Object._simple (ocrad.js:58053)
    at Function._simple (ocrad.js:58273)
    at OCRAD (ocrad.js:58264)
    at recognize_image (numbers.html:39)
    at HTMLImageElement.onclick (numbers.html:51)

[kba]

Can you run bash -ex build.sh and post the output to see where the build fails. What version of emscripten are you using? Do you have it installed in the right place ($HOME/emsdk_portable)?

[wzhsunn]

Thank you for your reply. the demo.html work well .

But the examples/browser/simple.html dosen't work

56f257e7-1625-4a15-b046-8544dc405fdd:13 Uncaught ReferenceError: Module is not defined
    at createOcradInstance (56f257e7-1625-4a15-b046-8544dc405fdd:13)
    at 56f257e7-1625-4a15-b046-8544dc405fdd:79000

Maybe something not init well, but the ocrad.js in the origin repo work well .

what should I do ?

This is my build.sh

# Define your emscripten path. Change it you don't use emscripten portable
#PATH="$HOME/emsdk_portable:$HOME/emsdk_portable/clang/fastcomp/build_master_64/bin:$HOME/emsdk_portable/node/4.1.1_64bit/bin:$HOME/emsdk_portable/emscripten/master:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games"
PATH="$HOME/emsdk_portable:$HOME/emsdk_portable/fastcomp/bin:$HOME/emsdk_portable/node/12.9.1_64bit/bin:$HOME/emsdk_portable/fastcomp/emscripten:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games"
#EMSCRIPTEN="$HOME/emsdk_portable/emscripten/master"
EMSCRIPTEN="$HOME/emsdk_portable/fastcomp/emscripten"
# autogenerate some parts of the postcode
python src/generate.py
# compile ocrad
cd ocrad-0.25
emconfigure ./configure
emmake make
emcc -02 --memory-init-file 0   -s WASM=0   -v  -s TOTAL_MEMORY=33554432  -s EXTRA_EXPORTED_RUNTIME_METHODS='["cwrap"]'   -s EXPORTED_FUNCTIONS="[  '_OCRAD_set_exportfile', '_OCRAD_transform', '_OCRAD_add_filter', '_OCRAD_version', '_OCRAD_open', '_OCRAD_close', '_OCRAD_get_errno', '_OCRAD_set_image', '_OCRAD_set_image_from_file', '_OCRAD_set_utf8_format', '_OCRAD_set_threshold', '_OCRAD_scale', '_OCRAD_recognize', '_OCRAD_result_blocks', '_OCRAD_result_lines', '_OCRAD_result_chars_total', '_OCRAD_result_chars_block', '_OCRAD_result_chars_line', '_OCRAD_result_line', '_OCRAD_result_first_character']"   ocradlib.o page_image_io.o page_image.o rectangle.o textpage.o bitmap.o blob.o textblock.o character_r11.o ucs.o character.o textline.o track.o rational.o profile.o mask.o feats.o common.o feats_test0.o feats_test1.o segment.o character_r12.o character_r13.o textline_r2.o  arg_parser.o user_filter.o iso_8859.o -o ../ocrad.js  --pre-js  ../src/pre.js  --post-js ../src/post.js

#-s EXTRA_EXPORTED_RUNTIME_METHODS='["cwrap"]'

make clean

[kba]

This is definitely an issue with the current (>=2015) version of emscripten. A workaround could be something like https://github.com/jedisct1/libsodium.js/commit/8f6c6a816eb608e9e18b77faacbb8e60fef119dd with a dummy definition of Module global.

[wzhsunn]

I compile ocradjs ， add --closure 1

emcc -02 --memory-init-file 0   -s WASM=0  --closure 1  -v  -s TOTAL_MEMORY=33554432  -s EXTRA_EXPORTED_RUNTIME_METHODS='["cwrap"]'   -s EXPORTED_FUNCTIONS="[  '_OCRAD_set_exportfile', '_OCRAD_transform', '_OCRAD_add_filter', '_OCRAD_version', '_OCRAD_open', '_OCRAD_close', '_OCRAD_get_errno', '_OCRAD_set_image', '_OCRAD_set_image_from_file', '_OCRAD_set_utf8_format', '_OCRAD_set_threshold', '_OCRAD_scale', '_OCRAD_recognize', '_OCRAD_result_blocks', '_OCRAD_result_lines', '_OCRAD_result_chars_total', '_OCRAD_result_chars_block', '_OCRAD_result_chars_line', '_OCRAD_result_line', '_OCRAD_result_first_character']"   ocradlib.o page_image_io.o page_image.o rectangle.o textpage.o bitmap.o blob.o textblock.o character_r11.o ucs.o character.o textline.o track.o rational.o profile.o mask.o feats.o common.o feats_test0.o feats_test1.o segment.o character_r12.o character_r13.o textline_r2.o  arg_parser.o user_filter.o iso_8859.o -o ../ocrad.js  --pre-js  ../src/pre.js  --post-js ../src/post.js

and numbers.html:

<body>
        <h1>Numeric Ocrad.js Example</h1>

        <script>
            var Module = typeof Module !== 'undefined' ? Module : {};

            function recognize_image(){
                document.getElementById('transcription').innerText = "(Recognizing...)";

                var text = OCRAD(document.getElementById("pic")
                , {
                    numeric: true
                }, function(text){
                    document.getElementById('transcription').className = "done"
                    document.getElementById('transcription').innerText = text;
                });
            }
        </script>
        <script src="../../ocrad.js"></script>
        <div id="main">
            <img id="pic" src="img/numbers.png" onclick="recognize_image()">
            <div id="transcription"></div>
        </div>
    </body> 

but the problem is as same as before :

a0c13ace-408a-49b9-ae49-00b05c4e63be:13 Uncaught ReferenceError: Module is not defined
    at createOcradInstance (a0c13ace-408a-49b9-ae49-00b05c4e63be:13)
    at a0c13ace-408a-49b9-ae49-00b05c4e63be:79000

Also in ocrad.js define Modue by pre.js

// The Module object: Our interface to the outside world. We import
// and export values on it. There are various ways Module can be used:
// 1. Not defined. We create it here
// 2. A function parameter, function(Module) { ..generated code.. }
// 3. pre-run appended it, var Module = {}; ..generated code..
// 4. External script tag defines var Module.
// We need to check if Module already exists (e.g. case 3 above).
// Substitution will be replaced with actual code on later stage of the build,
// this way Closure Compiler will not mangle it (e.g. case 4. above).
// Note that if you want to run closure, and also to use Module
// after the generated code, you will need to define   var Module = {};
// before the code. Then that object will be used in the code, and you
// can continue to use Module afterwards as well.
var Module = typeof Module !== 'undefined' ? Module : {};

// --pre-jses are emitted after the Module integration code, so that they can
// refer to Module (if they choose; they can also define Module)
var OCRAD = (function(){
function createOcradInstance(){

// more code ...

[wzhsunn]

And the performance is not very well on safari on iPhone X, recognize took 500 seconds.

[kba]

Sorry, I'm out of ideas. ocrad.js is a cool hack but it's a hack. ocrad itself can only do so much (try it on the command line, it's available for all major linux distros). If you have to do the OCR within a browser, maybe try tesseract.js. If it can be a client-server app, you have a wide variety of more modern choices.

[wzhsunn]

thank you very much. Could you help me with the module is not defined problem ? I try it a lot times , but it dose not work .