Here is my code, I need help with my def capture_and_save_screen function for capturing the screenshot and saving it to the controlling pc but I keep getting my "Error", "Invalid or incomplete image data received." comment I can't seem to find where I'm going wrong. I have a connect to scope function that already connect to the scope at GPIB address 5 and IDN's the scope successfully. Just can't get the screen capture. I've looked at all the tek forums but the SCIPI commands differ because their different scopes. This is for a TDS 7104 or a TDS 6604.
import tkinter as tk
from tkinter import messagebox, scrolledtext, filedialog
import pyvisa
import time
import warnings
class OscilloscopeAppEnhanced:
def __init__(self, master):
self.master = master
self.master.title("TDS 7704 Screen Capture Enhanced")
self.master.geometry("600x300")
# Label for GPIB address input
self.label_gpib_address = tk.Label(master, text="GPIB Address:")
self.label_gpib_address.pack()
# Input for GPIB address
self.entry_gpib_address = tk.Entry(master)
self.entry_gpib_address.pack()
# Create a button to initiate connection
self.connect_button = tk.Button(master, text="Connect", command=self.connect_to_scope)
self.connect_button.pack(pady=10)
# Create a button to initiate screen capture, now directly opens file dialog to save
self.capture_button = tk.Button(master, text="Capture and Save Screen", command=self.capture_and_save_screen, state=tk.DISABLED)
self.capture_button.pack(pady=10)
# Status/Command text area
self.text_status = scrolledtext.ScrolledText(master, height=5)
self.text_status.pack(pady=10)
# Initialize VISA resource manager
self.rm = pyvisa.ResourceManager()
self.scope = None
def connect_to_scope(self):
gpib_address_num = self.entry_gpib_address.get().strip()
try:
gpib_address = f"GPIB0::{gpib_address_num}::INSTR"
if not gpib_address_num.isdigit():
raise ValueError("Please enter a valid GPIB address number.")
self.scope = self.rm.open_resource(gpib_address)
self.scope.write("*CLS") # Clear any errors in the error queue.
self.scope.timeout = 5000 # Set timeout to 5000 ms (5 seconds) to allow time for response.
idn_response = self.scope.query("*IDN?").strip() # Query the instrument identity
if len(idn_response) == 0:
raise Exception("No response from instrument. Please check the connection and GPIB address.")
self.text_status.insert(tk.END, f"Successfully connected to the oscilloscope at {gpib_address}.\n")
self.text_status.insert(tk.END, f"Instrument IDN: {idn_response}\n")
self.capture_button["state"] = tk.NORMAL
except ValueError as ve:
self.text_status.insert(tk.END, f"Error: {str(ve)}\n")
except Exception as e:
self.text_status.insert(tk.END, f"Failed to connect to the oscilloscope: {str(e)}\n")
self.scope = None
def capture_and_save_screen(self):
fileSaveLocation = filedialog.asksaveasfilename(defaultextension=".png", filetypes=[("PNG files", "*.png"), ("All files", "*.*")])
if not fileSaveLocation:
messagebox.showerror("Error", "Operation cancelled or no file selected.")
return
if self.scope:
try:
# Assuming your oscilloscope is already configured to communicate over GPIB
self.scope.write('EXPort:IMAGe NORMal') # Set the export image to NORMAL
self.scope.write('EXPort:FORMat PNG') # Set the export format to PNG
self.scope.write('EXPort:VIEW FULLSCREEN') # Sets the exported view area to Full Screen
self.scope.write('HARDCopy:LAYout LANDscape') # Sets the hard copy page orientation to Landscape
self.scope.write('HARDCOPY:PORT GPIB') # Set the hardcopy port to GPIB
self.scope.write('HARDCOPY START') # Start the hardcopy process
time.sleep(10) # Adjust based on your oscilloscope's response time
# Read the image data from the oscilloscope
imgBytes = b""
while True:
try:
chunk = self.scope.read_raw()
if not chunk:
break # Break the loop if no more data is received
imgBytes += chunk
except pyvisa.errors.VisaIOError as e:
if e.error_code == pyvisa.constants.VI_ERROR_TMO: # Timeout error
break # Assume end of data on timeout
else:
raise # Re-raise the exception if it's not a timeout error
# Check if the received data is valid for a PNG image
if len(imgBytes) < 100: # Arbitrary minimum size check for a PNG file
messagebox.showerror("Error", "Invalid or incomplete image data received.")
return
with open(fileSaveLocation, "wb") as imgFile:
imgFile.write(imgBytes)
messagebox.showinfo("Success", f"Screen capture saved to {fileSaveLocation}.")
except Exception as e:
messagebox.showerror("Error", f"Failed to capture and save screen: {str(e)}")
# Run the application
def run_app_enhanced():
root = tk.Tk()
app = OscilloscopeAppEnhanced(root)
root.mainloop()
run_app_enhanced()