![]() ![]() Therefore, you must define these macros to use new functionality introduced in each major operating system release. The Windows header files use macros to indicate which versions of Windows support many programming elements. Otherwise, you will receive the C2065 error message. ![]() To compile an application that uses these functions, you must define the appropriate macros. This enables you to use the compiler to detect whether your application uses functions that are not supported on its target version(s) of Windows. Macros for Conditional DeclarationsĬertain functions that depend on a particular version of Windows are declared using conditional code. If you do not ensure that you are using the latest version of the SDK header files, you will receive the following error code when compiling code that uses features that were introduced after Visual C++ was released: error C2065: undeclared identifier. Therefore, if you install updated header files from an SDK, you may end up with multiple versions of the Windows header files on your computer. Microsoft Visual C++ includes copies of the Windows header files that were current at the time Visual C++ was released. Faster Builds with Smaller Header Files.Visual C++ and the Windows Header Files.Additional features include Header Annotations and STRICT Type Checking. For more information, see Getting Ready for 64-bit Windows. They use data types that enable you to build both 32- and 64-bit versions of your application from a single source code base. For more information, see Unicode in the Windows API. They include declarations for both Unicode and ANSI versions of the API. The header files for the Windows API enable you to create 32- and 64-bit applications. ![]()
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