SDL_Texture - 不完整类型 [英] SDL_Texture - Incomplete type

问题描述

一天前我安装了一个SDL2库。它不是在Debian Wheezy，所以我使用 configure，make，make install 命令。

a day ago I installed an SDL2 library. It is not in Debian Wheezy yet, so I used configure, make, make install commands.

当我尝试使用SDL_Texture，我得到这个错误：

After all, when I try to use SDL_Texture, I get this error:

error: forward declaration of ‘SDL_Texture {aka struct SDL_Texture}’
invalid use of incomplete type ‘SDL_Texture {aka struct SDL_Texture}’

我找到的是SDL_render.h中的这两行：

After looking for declaration, everything I found are these two lines in SDL_render.h:

struct SDL_Texture;
typedef struct SDL_Texture SDL_Texture; 

没有定义。我认为我的安装缺少文件SDL_sysrender.h。它是在源代码我下载的，但不是在SDL2包含路径。

No definition at all. I think my installation is missing file SDL_sysrender.h. It is in source code I downloaded, but not in SDL2 include path.

问题应该在哪里？它必须使用任何标志配置文件？
感谢您的帮助。

Where should be the problem? Its necessary to use any flag for configure file? Thank you for help.

推荐答案

安装没有问题。 SDL_Texture是一个不透明类型的设计（也就是说，设计为只能由SDL2内部操作），你可以传递作为一个指针，但你不能访问内部（或创建一个SDL_Texture自己，例如通过做一个malloc，因为你不知道结构的大小）。如果你坚持

There's nothing wrong with your install. SDL_Texture is an opaque type by design (that is, designed to only be operated on by SDL2 internally), you can "pass it around" as a pointer, but you can't access the internals (or create a SDL_Texture yourself, for example by doing a malloc, because you don't know the size of the structure). If you stick to

SDL_Texture *blah;

指针，并传递给SDL2函数，你应该很好。

pointers and pass them around to the SDL2 functions you should be fine.

SDL_sysrender.h是一个内部头，如前所述，实际上定义了SDL_Texture用于库的内部使用。

SDL_sysrender.h is an internal header which, as you mentioned, actually defines SDL_Texture for internal consumption of the library.

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