exe or .obj.) /DBUILDING_DLL defines the PRINT_API macro for this particular building process so that the printHello symbol is exported from this DLL.

/DBUILDING_DLL 为这个特定的构建过程定义了 PRINT_API 宏，以便从这个 DLL 导出 printHello 符号。

youdao

Consider the example in Listing 1, where you try to create a small.dll file that has a single function, printHello, which is called from the main routine in the main.cpp file.

请考虑清单1中的示例，在这个示例中，您尝试创建一个小的. dll文件，其中仅包含一个函数printhello，并且在main . cpp文件的main例程中调用了这个函数。

youdao