爱华网Open the project's Property Pages dialog box.Click the C/C++ folder.Click the Preprocessor property page.Modify the Preprocessor Definitions property.
/Dhas muchthe same effect as using the#definedirectiveat the beginning of the source file.However,/Dstrips[]quotes on the command line and#defineretainsthem.
vs 中的Preprocessor Definitions选项，是用来定义编译条件的，相当于在sourcefile的顶部使用#define一样。
The preprocessor definitions are usefor global pre-processor definitions for the current project;usually system or compiler pre-processor defintion.
for example, when in debug mode, oneof the definition will _DEBUG this will be used when compiling thecode if the user (programmer) wants to do something different whenbuilding in debug mode :
#ifdef _DEBUG/// do something ONLY in debug mode#endif
