在本课中，我们将用C语言写一个 Windows 程序，程序运行时将弹出一个消息框并显示"hello world"。理论：Windows 为编写应用程序提供了大量的资源。其中最重要的是Windows API (Application Programming Interface)。 Windows API是一大组功能强大的函数，它们本身驻扎在 Windows 中供人们随时调用。这些函数的大部分被包含在几个动态链接库(DLL)中，譬如：kernel32.dll、 user32.dll 和 gdi32.dll。 Kernel32.dll中的函数主要处理内存管理和进程调度；user32.dll中的函数主要控制用户界面；gdi32.dll中的函数则负责图形方面的操作。除了上面主要的三个动态链接库，您还可以调用包含在其他动态链接库中的函数，当然您必须要有关于这些函数的足够的资料。-In this lesson, we will use the C language to write a Windows program, will pop up a message box and display "hello world" program runs. Theory: Windows provides a lot of resources for the preparation of the application. One of the most important is the Windows API (Application Programming Interface). The Windows API is a large group of powerful functions themselves at any time call for people stationed in Windows. Most of these functions are included in several dynamic link library (DLL), such as: kernel32.dll, user32.dll and gdi32.dll. Kernel32.dll function to handle memory management and process scheduling　the user32.dll function control user interface　gdi32.dll in function is responsible for the operation of the graphics. In addition to the above three main dynamic link library, you can also call the functions contained in the dynamic link library, of course, you must have enough information about these functions.