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Semalt comparte un raspador de pantalla Guía de inicio rápido

Internet está lleno de datos, que van desde datos de ventas hasta tendencias del consumidor. Como tal, las empresas ahora están descubriendo qué tan crucial puede ser analizar tales datos. Pero antes de poder analizar estos datos, primero debe extraerlos y almacenarlos en un formato utilizable. Y eso es además del hecho de que debería filtrar los datos innecesarios para reducir el margen de error que surge durante la etapa de análisis.

Aquí es donde entra Screen Scraper, esta herramienta es capaz de extraer datos de sitios web y almacenarlos en varios formatos. Hoy veremos el tutorial de Screen Scraper. Aunque la herramienta es fácil de usar, algunos conocimientos de programación serán útiles, especialmente cuando se trata de proyectos de raspado complejos.

Descarga e instalación del software

Screen Scraper está disponible en todos los principales sistemas operativos; puede, por lo tanto, descargar una copia del programa desde su página oficial. Actualmente, el servicio se ofrece en tres paquetes diferentes: la versión gratuita básica, la versión pro que cuesta $ 549 y la versión empresarial que está disponible por $ 2799. Es importante tener en cuenta que puede probar la versión paga por 30 días y esto se recomienda para evitar pagar por un servicio que podría no satisfacer sus necesidades. Continúa e instala el programa y completa la configuración.

Configuración del servidor Proxy

Screen Scraper se basa en registrar las respuestas entre un servidor web y su navegador web. Para que esto suceda, deberá configurar un servidor proxy. Esencialmente, un servidor proxy se ubica entre un navegador y un servidor web, cada vez que haga clic en un enlace su navegador enviará una solicitud a un servidor de destino.

Continúe y configure su navegador para usar la sesión Proxy, hay tutoriales sobre cómo puede realizar esta tarea en cada navegador. Una vez configurado, su navegador enviará todas las solicitudes a través del proxy de Screen Scraper. Estas solicitudes son en las que se basa Screen Scraper. También se conocen como transacciones Proxy.

Se pueden contener múltiples transacciones proxy en un solo clic. El scrapper, por lo tanto, tiene que filtrar e identificar solo las transacciones útiles. Esto es lo que usará en el siguiente paso.

Grabación de transacciones HTTP

Inicie el navegador que está usando el servidor proxy y acceda a cualquier URL. Screen scraper registrará automáticamente esta operación y estará disponible en la tabla de transacciones HTTP.

Puede hacer clic en la transacción individual para ver detalles como encabezados HTTP y datos POST.

Generando un archivo raspable

Comience creando una nueva sesión de raspado. Esto contendrá todos los archivos y otros objetos que le permitirán extraer contenido de un sitio web determinado. Las transacciones relacionadas con este nuevo proyecto se visualizan haciendo clic en la pestaña de progreso. Es importante tener en cuenta que cada una de estas operaciones se puede usar para crear un archivo raspable simplemente seleccionando 'Generar archivo raspable' en el panel desplegable.

Creación de patrón de extractor

Un patrón de extractor es un bloque de código que contiene tokens especiales que coincidirán con los datos que desea extraer. Son etiquetas de texto rodeadas por delimitadores '@~'. Aquí es donde tendrá una buena comprensión de HTML, ya que tendrá que agregar tokens extractores seguidos por los nombres y los atributos individuales.

John O'Neil
Thank you all for reading my article! I'm excited to discuss the Quick Start Guide for the Semalt screen scraper. If you have any questions or comments, feel free to share them here.
Maria Hernandez
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John O'Neil
Thank you, Maria! I'm glad you found the guide helpful. Did you have any specific questions or challenges while using the scraper?
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John O'Neil
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Karen Miller
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John O'Neil
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John O'Neil
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John O'Neil
Thank you, Amy! I'm glad you found the guide helpful. If you have any suggestions or feedback for future improvements, please let me know.
Daniel Rodriguez
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John O'Neil
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John O'Neil
Thank you, Jackie! I appreciate your positive feedback. If there's anything you'd like to see covered in more detail in future updates of the guide, don't hesitate to let me know.
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John O'Neil
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Robert Taylor
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John O'Neil
You're welcome, Robert! I'm glad the guide made the setup process smooth for you. If you have any further questions or need assistance with any advanced features, feel free to reach out.
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John O'Neil
Thank you, Sophia! I appreciate your positive feedback. If you have any specific tips or tricks that you found useful while using the scraper, feel free to share with the community.
Thomas Clark
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John O'Neil
You're welcome, Thomas! I'm glad you found the guide comprehensive. If you have any suggestions for further improvements or any topics you'd like to see covered in more detail, please let me know.
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John O'Neil
Thank you, Emily! I'm glad the scraper has been saving you time. If you have any specific use cases or challenges you'd like to discuss, feel free to share.
Christopher Lewis
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John O'Neil
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John O'Neil
Thank you, Olivia! I'm glad the guide was helpful in understanding the features of the scraper. If you have any suggestions or feature requests, feel free to share.
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John O'Neil
You're welcome, Benjamin! I'm delighted that the guide provided you with the necessary information as a beginner. If you have any specific questions or need further assistance, feel free to ask.
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John O'Neil
Thank you, Victoria! It's great to know that the scraper has simplified your workflow. If you have any tips or best practices to share with others using the scraper, please do share.
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John O'Neil
You're welcome, Brandon! I'm glad the guide helped you overcome the initial difficulties. If you have any specific hurdles or common issues you encountered, it would be helpful to explore them and provide solutions.
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John O'Neil
Thank you, Hannah! I'm glad the scraper has been valuable for your research team. If you have any specific use cases or tips to share for research purposes, it would be beneficial for the community.
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John O'Neil
Thank you, Sophie! I'm glad the guide made the scraper accessible to users of all levels. If you have any additional suggestions or topics you'd like to see covered in the guide, please let me know.
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John O'Neil
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John O'Neil
Thank you, Natalie! I'm glad the guide was helpful for beginners. If there are any particular topics or examples you'd like to see covered in more detail, please let me know.
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John O'Neil
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John O'Neil
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John O'Neil
Thank you, Daniel! I appreciate your positive feedback. If there's anything specific you'd like to explore or have covered in future guides, let me know.
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John O'Neil
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John O'Neil
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John O'Neil
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John O'Neil
You're welcome, Benjamin! I'm glad the scraper is top-notch for you. If there are any particular use cases or challenges you'd like to discuss, feel free to share, and I'll be here to help.
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John O'Neil
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John O'Neil
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John O'Neil
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John O'Neil
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John O'Neil
You're welcome, Lily! I'm thrilled that the scraper has been a game-changer for your data analysis team. If there are any specific use cases or examples you'd like to share, it would be beneficial for others.
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Thank you, Sophia! I'm glad you find the scraper the best tool for data extraction. If there are any specific features or capabilities you'd like to see added, please let me know.
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John O'Neil
Thank you, Christian! I'm thrilled that the scraper exceeded your expectations. If there's anything specific you found most useful and would like to explore in more depth, please let me know.
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John O'Neil
Thank you, Oliver! I'm glad you find the scraper fantastic. If there are any specific features or use cases you'd like to discuss further, feel free to share and we can explore them in detail.
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John O'Neil
You're welcome, Mia! I'm thrilled that the scraper has been a savior for your data collection tasks. If there are any specific examples or challenges you faced, feel free to share and we can discuss solutions.
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John O'Neil
Thank you, Joseph! I appreciate your positive feedback. If there are any specific topics or functionality you'd like to explore in more detail, please let me know.
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John O'Neil
You're welcome, Emily! I'm thrilled that the scraper has been invaluable for your research projects. If there are any specific research use cases or best practices you'd like to discuss, feel free to share and we can explore them together.
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John O'Neil
Thank you, Jacob! I'm glad you find the scraper reliable for data extraction. If there are any specific features or data sources you found particularly useful, please let me know.
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John O'Neil
Thank you, Emma! I'm glad you find the scraper an excellent choice for data extraction. If there are any specific use cases or challenges you'd like to discuss, feel free to share so we can address them together.
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You're welcome, William! I'm glad you find the scraper the best tool you've used. If there are any specific features or capabilities that make it stand out for you, please share.
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Thank you, Ella! I appreciate your positive feedback. If there are any specific steps or sections in the guide that you found particularly useful, please let me know.
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John O'Neil
You're welcome, Jackson! I'm thrilled that the scraper has helped you save time and effort. If there are any specific time-saving features or techniques you'd like to explore, please share, and we can discuss them further.
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Thank you, Leah! I'm glad you find the scraper powerful and efficient. If there are any specific intricacies or advanced topics you'd like to explore further, please let me know.
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John O'Neil
You're welcome, William! I'm thrilled that the scraper is a game-changer for data extraction. If there are any specific features or use cases you'd like to discuss, feel free to share.
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John O'Neil
Thank you, Katherine! I'm glad you find the scraper perfect for automating data extraction. If there are any specific automation scenarios or challenges you'd like to discuss, feel free to share.
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John O'Neil
You're welcome, David! I'm thrilled to hear that the scraper has revolutionized your data extraction process. If there are any specific data extraction challenges or best practices you'd like to discuss, please share.
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