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Selenium में Website Screenshot खाली आए तो Window और Wait Settings ठीक करें

Selenium screenshot खाली हो तो सही browser context, वास्तविक window size और page-specific render condition जाँचें—सिर्फ navigation पूरा होने पर निर्भर न रहें।
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अगर Selenium का screenshot खाली आ रहा है, तो पहले पुष्टि करें कि सही tab और URL सक्रिय हैं, browser window का आकार अपेक्षित है, और capture से पहले पेज का जरूरी content वास्तव में render हो चुका है। Navigation पूरा होना JavaScript-आधारित पेज के तैयार होने का प्रमाण नहीं है।

पहले जाँचें कि screenshot सही पेज और window से लिया जा रहा है

Selenium का screenshot मौजूदा browser context का capture होता है। इसलिए screenshot लेने से पहले current URL और active tab/window की पुष्टि करें; अगर navigation किसी दूसरी tab में गई है, तो capture में आपकी अपेक्षित page नहीं आएगी।

print("URL:", driver.current_url)
print("Window handles:", driver.window_handles)
print("Active handle:", driver.current_window_handle)

यदि target window का handle अलग है, तो उसी पर switch करें:

driver.switch_to.window(target_handle)
print("URL:", driver.current_url)

Selenium की window/tab handling और screenshot behavior की जानकारी Working with windows and tabs में है।

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Window size सेट करें और वास्तविक आकार पढ़ें

Viewport का आकार page layout और responsive rendering बदल सकता है। अपनी जरूरत के अनुरूप dimensions सेट करें, फिर session से मिले वास्तविक width और height पढ़ें—requested size को लागू हुआ मानकर न चलें।

driver.set_window_size(1024, 768)
size = driver.get_window_size()
print("Observed window size:", size["width"], "x", size["height"])

यह 1024 × 768 केवल उदाहरण है, कोई सार्वभौमिक सही आकार नहीं। उस viewport का उपयोग करें जिसमें page का अपेक्षित layout दिखना चाहिए। Selenium के Window interactions दस्तावेज़ में sizing API के उदाहरण हैं।

Navigation लौटने के बाद page-specific condition का इंतजार करें

Navigation का ready state और application का तैयार render अलग बातें हैं। JavaScript बाद में content जोड़ या बदल सकती है। इसलिए किसी तय sleep पर निर्भर रहने के बजाय उस element की visibility का explicit wait करें जो capture के लिए जरूरी content की मौजूदगी साबित करता है। Selenium conditions में element मौजूद होना, visible होना, text दिखाई देना और title जाँचना शामिल हैं।

from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.support.wait import WebDriverWait

wait = WebDriverWait(driver, timeout=10)
wait.until(EC.visibility_of_element_located((By.CSS_SELECTOR, "main")))
image = driver.get_screenshot_as_png()
with open("page.png", "wb") as file:
    file.write(image)

अपने page के लिए ऐसा CSS selector चुनें जो target content को दर्शाता हो; हर साइट पर main मौजूद या पर्याप्त नहीं होगा। 10 सेकंड उदाहरण है, सार्वभौमिक रूप से पर्याप्त timeout नहीं। Selenium के Expected Conditions में visibility, text और title जैसी शर्तें दी गई हैं।

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Fixed sleep के बजाय condition-based wait क्यों

एक fixed delay जल्दी खत्म हो सकता है, जिससे capture render से पहले हो जाए; बहुत लंबा हो तो अनावश्यक इंतजार कराता है। Explicit wait किसी निर्दिष्ट condition को poll करता है और condition पूरी होने पर आगे बढ़ता है। Selenium की Waiting Strategies के अनुसार implicit और explicit waits को मिलाने से बचें: Selenium चेतावनी देता है, “Do not mix implicit and explicit waits. Doing so can cause unpredictable wait times.”

Page-load strategy का मतलब समझें

Browser options में page-load strategy यह नियंत्रित करती है कि navigation कब लौटेगी; यह अपने-आप single-page application के बाद के rendering को तैयार नहीं करती।

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Strategy Navigation कब लौटती है Capture से पहले क्या करें
normal Load event के बाद जरूरी asynchronous content के लिए page-specific explicit wait रखें।
eager DOMContentLoaded के बाद Visible content या अन्य वास्तविक capture condition का इंतजार करें।
none Ready state का इंतजार किए बिना Navigation लौटते ही capture न करें; पर्याप्त explicit synchronization जोड़ें।

इन विकल्पों और timeouts का विवरण Selenium के Browser Options दस्तावेज़ में है। Strategy बदलना application-specific wait का विकल्प नहीं है।

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खाली screenshot के लिए जाँच क्रम

  1. URL और context: driver.current_url, active window handle और उपलब्ध handles देखें; target tab पर switch करें।
  2. आकार: window size सेट करें, फिर get_window_size() से प्राप्त dimensions जाँचें।
  3. Render condition: target page के प्रतिनिधि content की visibility, अपेक्षित text या title का explicit wait लगाएँ।
  4. Wait configuration: implicit और explicit waits को एक साथ सक्रिय न रखें।
  5. Browser और driver: समस्या बनी रहे तो दूसरे browser में वही flow देखें और browser-specific driver तथा version की जाँच करें।

इन जाँचों से किसी खास run का root cause पहले से तय नहीं होता; वास्तविक URL, context, dimensions और rendered state देखकर ही उसे अलग किया जा सकता है। Selenium के Troubleshooting Assistance में synchronization और driver समस्याओं पर मार्गदर्शन है; Understanding Common Errors visibility और interaction errors समझाता है।

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Or skip the browser setup

ScreenshotNeo एक website screenshot API है: एक GET request से PNG, JPEG, WebP या PDF capture माँगा जा सकता है। नीचे cURL उदाहरण है; API विकल्पों के लिए ScreenshotNeo docs देखें।

curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webp

ScreenshotNeo capture से पहले cookie/consent banners स्वीकार करता है और 60 से अधिक ज्ञात consent platforms, newsletter popups तथा chat widgets हटाता है; ये चरण बंद भी किए जा सकते हैं। Bot checks/CAPTCHAs, blank pages, timeouts, failed loads और cache hits के लिए शुल्क नहीं लगता, और response बताता है कि page verdict तथा billing स्थिति क्या रही। AI agents के लिए MCP server में take_screenshot, get_page_info और capture_pdf tools हैं। Free plan में बिना card के 1,000 screenshots प्रति माह हैं; paid plans $5 में 3,000 से शुरू होते हैं। विवरण और API उपयोग के लिए ScreenshotNeo देखें।

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