SDL_Surface 的外部编译错误
我在 Code::Block 中遇到 SDL_Surface 变量的编译错误。 奇怪的是，这是我第一次收到这种错误，因为我以前使用过这行代码并且运行得很好。
导致此问题的代码示例行之一（具有相同问题的代码行之一）是：
extern SDL_Surface *screen;
产生的错误是这样的：
expected init-declarator before "extern"|
expected `,' or `;' before "extern"|
||=== Build finished: 2 errors, 0 warnings ===|
我试图理解该错误，但我无法说出它是什么。 有谁知道可能出了什么问题？
I've been getting a compile error in Code::Block for an SDL_Surface variable. Strangely enough, this is the first time I have received this kind of error, as I have used this line of code previously and it has worked fine.
One (of several with the same problem) sample line of code that causes this problem is:
extern SDL_Surface *screen;
The resulting error is this:
expected init-declarator before "extern"|
expected `,' or `;' before "extern"|
||=== Build finished: 2 errors, 0 warnings ===|
I tried to understand the error, but I can not tell what it is. Does anyone know what might be wrong?
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这是一个疯狂的猜测，因为我没有太多工作可做。 在
extern之前，您是否拥有SDL_Surface所需的所有标头？It's a wild guess since I don't have much to work with. Do you have all the headers required for
SDL_Surfacebefore thatextern?您似乎缺少
SDL_Surface的定义。 确保#include定义了SDL_Surface的正确头文件。 或者，如果您实际上并未使用 screen 变量（即您未访问其任何字段），则可以使用不完整类型来声明它，如下所示：It looks like you're missing the definition of
SDL_Surface. Make sure to#includethe proper header file in whichSDL_Surfaceis defined. Alternatively, if you're not actually using thescreenvariable (i.e. you're not accessing any of its fields), you can declare it using an incomplete type as so: