Hey there, let's break down your questions step by step—first fixing that "Failed" error when opening .xlsx files, then covering the best ways to handle these files, and finally sharing top Qt books and tutorials.

1. Best Ways to Open .xlsx Files (Read-Only or Read-Write) #

Read-Only Scenarios #

• libxl: A lightweight library that doesn't require Office installed. It's fast for read-only operations, supports .xlsx natively, and has a straightforward API.
• Qt Xlsx Module (Read-Only Mode): If you're already working in the Qt ecosystem, this official extension integrates seamlessly. It's perfect for quick data extraction without extra dependencies.
• Pandas (Python辅助方案): If cross-language tools are acceptable, pandas can read .xlsx files in one line of code—great if you just need to pull data for analysis.

Read-Write Scenarios #

• Qt Xlsx Module: The most Qt-native option, supporting full read-write operations including styles, formulas, and sheet management. It's the go-to if you want to keep everything within your Qt project.
• LibreOffice SDK: Ideal for maximum format compatibility, as it leverages LibreOffice's backend. Note that users will need LibreOffice installed on their machines.
• Apache POI: An industry-grade Java library. If your project can use JNI calls or has a Java backend, it handles even the most complex .xlsx features (like macros or advanced formatting).

2. Troubleshooting the "Failed" Error #

Here are the most common reasons you might be seeing that error, and how to check them:

• Corrupted File: First test opening the file with native Excel or LibreOffice. If those fail too, the file itself is damaged—try Excel's built-in "Open and Repair" feature, or re-download/re-save the file.
• Mismatched Library Versions: For tools like Qt Xlsx Module, make sure your Qt version matches the module's supported version (e.g., Qt 5.15 requires a specific Xlsx module release).
• Missing Dependencies: Libraries like libxl need their corresponding dynamic libraries (.dll on Windows, .so on Linux) in your program's runtime directory. Double-check you've included all required files.
• Permission/Locking Issues: Ensure your program has read/write access to the file's directory. Also, make sure the file isn't open in another program (like Excel) which might lock it.
• Non-Standard .xlsx Format: Some files generated by third-party tools don't strictly follow the OOXML standard. Try re-saving the file as a standard .xlsx in Excel first, then test again.
• Incorrect File Path: If you're using code to open the file, verify the full file path is correct (relative paths can be tricky—print the full path in your debug logs to check).

3. Top Qt Books & Tutorials #

Books #

• 《C++ GUI Programming with Qt 5》: The definitive guide for Qt 5. It covers everything from basic UI building to advanced topics like multithreading and database integration, with practical example code you can reuse.
• 《Qt 6 Programming Guide》: Updated for Qt 6, this book dives into new features like improved QML, Qt Quick 3D, and Qt 6's modular architecture. Perfect for developers looking to transition to the latest version.
• 《Advanced Qt Programming: Creating Great Software with C++ and Qt 4》: Even though it's focused on Qt 4, many core concepts (signal-slot mechanism, model-view architecture) are still relevant for Qt 5/6. Great for deepening your understanding of Qt's underlying design.

Tutorials #

• Qt Official Getting Started Guides: Don't sleep on the official docs! The "Getting Started with Qt" series walks you through setting up projects, building basic UIs, and understanding key Qt concepts—this is the best starting point for beginners.
• Qt Quick/QML Practical Projects: Look for hands-on tutorials (like building a calculator, music player, or weather app) to learn QML. These projects help you apply syntax and component knowledge in real scenarios.
• Open Source Qt Projects on GitHub: Clone small, well-documented Qt projects (e.g., a simple text editor, serial port tool) and modify them. Reading and tweaking existing code is one of the fastest ways to learn.

内容的提问来源于stack exchange，提问作者Takahashi