PyQt4, QThread and opening big files without freezing the GUI
- by jmrbcu
Hi, I would like to ask how to read a big file from disk and maintain the PyQt4 UI responsive (not blocked). I had moved the load of the file to a QThread subclass but my GUI thread get freezed. Any suggestions? I think it must be something with the GIL but I don't know how to sort it?
EDIT:
I am using vtkGDCMImageReader from the GDCM project to read a multiframe DICOM image and display it with vtk and pyqt4. I do this load in a different thread (QThread) but my app freeze until the image is loaded. here is an example code:
class ReadThread(QThread):
def __init__(self, file_name):
super(ReadThread, self).__init__(self)
self.file_name = file_name
self.reader.vtkgdcm.vtkGDCMImageReader()
def run(self):
self.reader.SetFileName(self.file_name)
self.reader.Update()
self.emit(QtCore.SIGNAL('image_loaded'), self.reader.GetOutput())
