image save button improved, so that it wont overwrite

cameraGui.py

@@ -18,6 +18,7 @@ from subclasses.controllayouts import LaserControlLayout, LaserScanLayout
 from subclasses.cameraParameterFrame import CameraParameterFrame
 from resources.scanFunctions import create_measurement_array
 from resources.storage import get_date_string
+from resources.messages import show_warning
 from appsettings import WORKING_DIR
 from measurement import MeasurementFrame
 import sys, os
@@ -316,7 +317,7 @@ class CameraGuiMainWindow(QMainWindow):
         measure_params['comment'] = self.measurementFrame.comments.toPlainText()
         for l in LaserControlLayout._registry:
             for sb_name, sb in l.spinboxes.items():
-                measure_params['sb_name'] = sb.value()
+                measure_params[sb_name] = sb.value()
 
         for roi in self.rois:
             measure_params['Roi Pos'] = roi.pos()
@@ -324,11 +325,22 @@ class CameraGuiMainWindow(QMainWindow):
         self.signalWithMeasurementParameters.emit(measure_params)
 
     def save_current_image(self):
+        if self.cameraParamFrame.imagePrefix.text()=='':
+            show_warning('You have to write a filename')
+            return
+        if '.' in self.cameraParamFrame.imagePrefix.text():
+            show_warning('No points in your filename please')
+            return
         saving_directory = WORKING_DIR + get_date_string()
         if not os.path.exists(saving_directory):
             os.makedirs(saving_directory)
             os.makedirs(saving_directory + '/images')
-        np.save(saving_directory+'/images/'+self.cameraParamFrame.imagePrefix.text(), self.current_image)
+
+        filename = saving_directory+'/images/'+self.cameraParamFrame.imagePrefix.text()
+        if os.path.isfile(filename+'.npy'):
+            show_warning('File already exists!')
+        else:
+            np.save(filename, self.current_image)
         
     def __del__(self):
         print("chau gui")