from pyscreenshot.imcodec import codec
from pyscreenshot.procutil import run_in_childprocess
import os,sys
from easyprocess import EasyProcess
import logging
from pyscreenshot.loader import FailedBackendError
from pyscreenshot.tempdir import TemporaryDirectory

log = logging.getLogger(__name__)

# 0 = multiprocessing (fork)
# 1 = popen (spawn)
POPEN=1

def childprocess_backend_version(_backend_version, backend):
    if POPEN:
        return childprocess_backend_version_popen(backend)
    else:
        return run_in_childprocess(_backend_version, None, backend)

def childprocess_backend_version_popen(backend):
    python=sys.executable
    cmd=[python,'-m','pyscreenshot.cli.print_backend_version' ,backend]
    p = EasyProcess(cmd).call()

    if p.return_code!=0:
        log.error(p)
        raise FailedBackendError(p)

    return p.stdout

def childprocess_grab(_grab_simple, backend, bbox):
    if POPEN:
        return childprocess_grab_popen(backend,bbox)
    else:
        return run_in_childprocess(_grab_simple, codec, backend, bbox)

def childprocess_grab_popen(backend,bbox):
    if not bbox:
        bbox=(0,0,0,0)
    x1,y1,x2,y2=map(str,bbox)
    python=sys.executable
    with TemporaryDirectory(prefix='pyscreenshot') as tmpdirname:
        filename = os.path.join(tmpdirname, 'screenshot.png')

        cmd=[python,'-m','pyscreenshot.cli.grab_to_file' ,filename ,x1,y1,x2,y2 ,'--backend',backend]
        p = EasyProcess(cmd).call()

        if p.return_code!=0:
            #log.debug(p)
            raise FailedBackendError(p)

        data = open(filename,'rb').read()
        data = codec[1](data)
        return data
@@ -1085,24 +1085,65 @@
 kend,bbox):%0A
+    if not backend:%0A        backend = ''%0A
     if not b

fix default backend