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How can I write data in a Word or PDF document using C++?
If you're just doing this on Windows, there is a way to do it in native code, using the Win32 API for interfacing with COM, but there's also a way to do this in .Net. I did it many years ago with Excel. I remember downloading an interface library to do it, but I don't remember the technical name for it now. You could probably find it by googling ".Net COM Microsoft Word." I used VB.Net inside a managed DLL for interfacing with Excel, since its language rules work nicely with Office COM. I then linked the DLL into a C# project I was working on. I often used VBA (Visual Basic for Applications) documentation when looking up Office COM API calls, since there was a reasonably good mapping between Office COM and VBA. It worked as Dragi described. I programmatically started up an instance of Excel, with a parameter to turn its UI off. In some cases I remember making calls that resembled the steps one would go through to go through Excel's menu system to do something. Doing what I'm describing used to be called "Office Automation." In other cases you work with the application's internal data structures. As when you're using the application yourself, you need to remember to have your program go through the steps to save the document you're working on, when you're done with it. When you want to shut the application down, you have to make sure to un-reference all Office COM objects before you tell the application to "exit." The application being automated will not exit until all of the COM objects that were used are not being referred to by the program automating them. In C++, this means making sure their reference counts are zero. In .Net, it was really important to null out all variables in my code that referred to the interface library's objects when I was ready to exit. Since .Net is garbage collected, I had to do a special step. I first told Excel to "exit." Then I explicitly ran the garbage collector. Then Excel finally shut down. Since my own code was using the .Net interface library I mentioned earlier, all of its objects needed to be garbage collected to finally release the COM objects. If you're using Managed C++ (or if that's a possibility), it would be possible to do what I described above with .Net, and integrate it into your C++ code.
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In this case, if you've ever used COM as a data type, you have to know when to pass in a string. Otherwise, your code just doesn't work right. But even in code that wasn't intended to be COM-based, you would need to be careful to pass along the right COM object to Excel when you did something involving it.