RemoteGraphicsView.py 文件源码

def __init__(self, *args, **kwds):
        ## Create shared memory for rendered image
        #pg.dbg(namespace={'r': self})
        if sys.platform.startswith('win'):
            self.shmtag = "pyqtgraph_shmem_" + ''.join([chr((random.getrandbits(20)%25) + 97) for i in range(20)])
            self.shm = mmap.mmap(-1, mmap.PAGESIZE, self.shmtag) # use anonymous mmap on windows
        else:
            self.shmFile = tempfile.NamedTemporaryFile(prefix='pyqtgraph_shmem_')
            self.shmFile.write(b'\x00' * (mmap.PAGESIZE+1))
            fd = self.shmFile.fileno()
            self.shm = mmap.mmap(fd, mmap.PAGESIZE, mmap.MAP_SHARED, mmap.PROT_WRITE)
        atexit.register(self.close)

        GraphicsView.__init__(self, *args, **kwds)
        self.scene().changed.connect(self.update)
        self.img = None
        self.renderTimer = QtCore.QTimer()
        self.renderTimer.timeout.connect(self.renderView)
        self.renderTimer.start(16)