c++ - 使用 graphics.h 时 undefined reference ？

Question

我正在尝试在开发 C++ 5.7.1 中使用 graphics.h。

我已经在互联网上搜索了可用的选项。我在包含文件夹中下载了 graphics.h 库，并在参数选项中选择了以下内容:

-lbgi
-lgdi32
-lcomdlg32
-luuid
-loleaut32
-lole32

我仍然不明白为什么它会向我显示这些错误:

undefined reference to `initgraph'
undefined reference to `graphresult'
undefined reference to `grapherrormsg'
undefined reference to `getmaxx'
undefined reference to `getmaxy'
undefined reference to `getmaxcolor'
undefined reference to `getcolor'
undefined reference to `circle'
undefined reference to `closegraph'
[Error] ld returned 1 exit status.

这是我的代码:

#include<iostream>
#include<graphics.h>
#include<stdlib.h>
#include<stdio.h>
//#include<conio>
int main(void)
{
       /* request auto detection */
       int gdriver = DETECT, gmode, errorcode;
       int midx, midy;
       int radius = 100;
       /* initialize graphics and local variables */
       initgraph(&gdriver, &gmode, "C:\\Program Files (x86)\\Dev-Cpp\\MinGW64\\include\\winbgim");
       /* read result of initialization */
       errorcode = graphresult();
       if (errorcode != grOk)  /* an error occurred */
       {
           printf("Graphics error: %s\n", grapherrormsg(errorcode));
        printf("Press any key to halt:");
      getch();
      exit(1); /* terminate with an error code */
   }
   midx = getmaxx() / 2;
   midy = getmaxy() / 2;
   setcolor(getmaxcolor());
   /* draw the circle */
   circle(midx, midy, radius);
   /* clean up */
   getch();
   closegraph();
   return 0;
}

Answer 1

将以下文件下载到提到的目录:

这里我假设你安装了 Dev-Cpp 到 C:\Dev-Cpp

http://www.cs.colorado.edu/~main/bgi/dev-c++/graphics.h目录:> C:\Dev-Cpp\include http://www.cs.colorado.edu/~main/bgi/dev-c++/libbgi.a目录:> C:\Dev-Cpp\lib

创建一个新的C++项目并设置“Project Options->Parameters->Linker”为

-lbgi
-lgdi32
-lcomdlg32
-luuid
-loleaut32
-lole32

并尝试执行此示例代码；然后找到您在上面发布的代码。

#include<graphics.h>

int main( ){
        initwindow( 700 , 700 , "MY First Program");
        circle(200, 200, 150);
        getch();
        return 0;
}