问题描述
我有2个VC ++解决方案 A& B（VS2008）都具有相同的代码库（只有几行代码不同）。两者都使用DXVAHD.h。
Hi I am having 2 VC++ solutions "A" & "B" (VS2008) both are having the same codebase (with just few lines of code different). Using DXVAHD.h in both.
dxvahd.h是标准的Microsoft头文件。如果打开此头文件，则会看到条件条件，即
#if WINAPI_FAMILY_PARTITION（WINAPI_PARTITION_DESKTOP）
dxvahd.h is a standard Microsoft header file. If we open this header file, we see there is a conditional if"#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)"
而在另一个解决方案 B中，此条件#if为true，因此没有问题与
Whereas in another solution "B", this conditional #if is true,hence no issues & its working fine.
有人可以让我知道如何在解决方案 A中解决此问题，其中上面的#if变灰了/不编译。 PLz帮帮我。
谢谢。
推荐答案
查看，您会看到这些宏用于确定您拥有的平台以及适合您的平台的API。
Looking at winapifamily.h, you can see that these macros are used to determine what platform you have and what API's are suitable for your platform.
/*
* Windows APIs can be placed in a partition represented by one of the below bits. The
* WINAPI_FAMILY value determines which partitions are available to the client code.
*/
#define WINAPI_PARTITION_DESKTOP 0x00000001
#define WINAPI_PARTITION_APP 0x00000002
/*
* A family may be defined as the union of multiple families. WINAPI_FAMILY should be set
* to one of these values.
*/
#define WINAPI_FAMILY_APP WINAPI_PARTITION_APP
#define WINAPI_FAMILY_DESKTOP_APP (WINAPI_PARTITION_DESKTOP | WINAPI_PARTITION_APP)
/*
* A constant that specifies which code is available to the program's target runtime platform.
* By default we use the 'desktop app' family which places no restrictions on the API surface.
* To restrict the API surface to just the App API surface, define WINAPI_FAMILY to WINAPI_FAMILY_APP.
*/
#ifndef WINAPI_FAMILY
#define WINAPI_FAMILY WINAPI_FAMILY_DESKTOP_APP
#endif
/* Macro to determine if a partition is enabled */
#define WINAPI_FAMILY_PARTITION(Partition) ((WINAPI_FAMILY & Partition) == Partition)
/* Macro to determine if only one partition is enabled from a set */
#define WINAPI_FAMILY_ONE_PARTITION(PartitionSet, Partition) ((WINAPI_FAMILY & PartitionSet) == Partition)
所以您的 WINAPI_PARTITION_DESKTOP 仅在您在系统的桌面系列上运行时设置。
So your WINAPI_PARTITION_DESKTOP would only be set if you are running on a Desktop family of the the system.
这篇关于dxvahd.h中的#if WINAPI_FAMILY_PARTITION（WINAPI_PARTITION_DESKTOP）Microsoft头文件何时变为true的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！