c++ - SDL_rect 没有命名类型

Question

我一直在试用 SDL 2，但遇到了 SDL_Rect does not name a type 错误...代码:

#include <stdio.h>
#include <SDL.h>

using namespace std;


SDL_Window* gWindow = NULL;
SDL_Surface* gWSurface = NULL;
SDL_Surface* gFinalImage = NULL;
int screenW = 640;
int screenH = 480;

SDL_Rect stretchRect;
stretchRect.x = stretchRect.y = 0;
stretchRect.w = screenW;
stretchRect.h = screenH;

错误日志:

||=== Build: Debug in SDLEvents (compiler: GNU GCC Compiler) ===|
D:\My Works\SDL Stretching\TestingSDL.cpp|12|error: 'stretchRect' does not name a type|
D:\My Works\SDL Stretching\TestingSDL.cpp|13|error: 'stretchRect' does not name a type|
D:\My Works\SDL Stretching\TestingSDL.cpp|14|error: 'stretchRect' does not name a type|

我已经在线检查过这里的另一个问题，但到目前为止还没有解决问题......谢谢大家

Answer 1

如果我正确理解你显示的代码，你会尝试在全局范围内，在任何函数之外对矩形进行初始化。你这样做是不可能的，你不能在函数之外有赋值语句。

有两种解决方法:

1. 在声明中初始化，如

   SDL_Rect stretchRect = { values... };
   

2. 在全局范围内声明变量，并在函数中初始化:

   SDL_Rect stretchRect;
   
   ...
   
   int main()
   {
       stretchRect.x = stretchRect.y = 0;
       stretchRect.w = screenW;
       stretchRect.h = screenH;
   
       ...