本文解决在使用 DirectX8 SDK 编译 DirectInput 代码时遇到的未声明标识符错误问题。为确保代码兼容性，在包含 dinput.h 之前，需定义 DIRECTINPUT_VERSION 常量为特定值。
www.mvps.org/directx/faq/directx_general_issues.htm#dinputcreate
Q. When attempting to compile under the DirectX 8 SDK, I recieve a compiler error stating that DirectInputCreateEx or DirectInputCreate is an undeclared identifier.
Compiling code for previous versions of DirectInput under DirectX 8, you must define a constant specifying the required version support prior to including dinput.h. DefineDIRECTINPUT_VERSIONto be equal to0x300,0x0500, or0x0700, like this:
#define DIRECTINPUT_VERSION 0x0700
#include <dinput.h>
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