我如何 go 关于这个程序？

Question

I have a program that has a lot of.cpp, .h and.dfm files. I have just recently started learning about Visual C++ with MFC. The program doesn't have any.ncb or solution object files, because of which I am unable to understand as to how to start understanding the program. There are lots and lots of files and its quite confusing to understand the flow. There are two folders as well. One with.ac files and the other with text files. Could anyone suggest me an easier way to start off? Eventually, after looking at this program's code, I have to create my own program which is kind of similar to this but with added functionality.

Kindly help please.

Cheers.

Answer 1

While I dont use C++ Builder, but .dfm suggest it is for other IDE than Visual C++. My hints would be:

• Possibly it is the same source code for multiple IDEs. Quite possible that all source files are not applicable for all IDEs. They are selectively added for different IDEs. Some core files might be added for all projects (ie for in .SLN , .DSW , .VCPROJ , .DFM
• If it is really MFC project, search for: CWnd , CWinApp , InitInstance , CString , OnInitDialog , BEGIN_MESSAGE_MAP , ON_WM_ , afx_msg etc.
• In MFC project, there is no main or WinMain - program starts at InitInstance .

It is hard to gain knowledge of big VC++ project, and understanding MFC code would be quite troublesome for beginner!

Answer 2

Some tips:

Use the Find in Files button to find the characters main . If you find a main(), an _tmain(), or a WinMain this will tell you a lot about what you have. If there's an exe, run it - that will show you what to look for also.

Visual Studio 2010 has an option to create a solution from source files, so that may also help you.

If you think it's an MFC app, look for the View class, the Document class and so on.

In Visual Studio 2010 Navigate To (Ctrl,) is super helpful - using mixed case words in your search term will do a very clever search. So if you run it and see a button labelled Open Policy, then you search with Navigate To for OpenPolicy, it will find PolicyOpen and OpenNewPolicy and plenty more that Find in Files would not.

Good luck!

Answer 3

People are answering what IDE the project uses, I don't think figuring that out helps you understand what's going on in the project.

For reading the project, the path I might follow would be go through the calls in WinMain as a debugger, you need to go step by step to see what actually happens. Not Ad, but I find Source Insight is helpful on reading bunches of source files. Or if you're familiar with cygwin, the basic "find & grep" is also handy but powerful tools to help you go through source files.

To learn MFC, my own learning experience is create simple project and write code yourself. Don't rely too much on the IDE, although it has some fancy automation staff, such as double clicking on the control in UI design view and it automatically generates message handlers for you, but IMHO it does not help you to understand how MFC registers/handles this message. Write your own message handler and register it manually, will give you a better idea on why and how it works.

Hope this helps.

Answer 4

Create new Project in Visual Studio and then add that files to project.. then press CTRL+F5 and Bulid Project.