转到项目 - > 属性 - > C / C ++ - > 命令行。您最可能在您的 / DWIN32之前有 / I。由于某种原因，一个空的include指令导致/ D蒸发，因此你的错误。

Go to Project-->Properties-->C/C++-->Command line. You most probably have a /I"" before your /D "WIN32". For some reason an empty include directive causes the /D to evaporate hence your error.

转到项目 - > 属性 - > C / C ++ - > 一般 - > 其他包含目录，并确保没有冗余的字符。

Go to Project-->Properties-->C/C++-->General-->Additional include directories and make sure there are no redundant chars there.

例如，当最后一个include目录是对不存在的环境变量的引用时。

It can for example arise when the last include directory is a reference to an environement variable that doesn't exist.