I want to establish a IDE at my laptop to compile the source code of Network Management System. I have choose MinGW as C++ compiler and Code::Blocks as the IDE.

You can download Code::Blocks from http://www.codeblocks.org/downloads  and MinGW from https://sourceforge.net/project/showfiles.php?group_id=2435&package_id=240780, It should be noted that MinGW's installation package only contains a Web-stub, It means that the installation will download files from Internet according your options. In particular, you should install G++ to you laptop, otherwise you can not compile C++ source code.

Open Code::Blocks, click "setting"-"compiler and debugger"

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Select "GNU GCC Compiler" in the drop-down,and navigate to "Toolchain executable"

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You should confirm the MinGW path was set correctly.If so, you can begin your work now.