使用 glui 菜单栏

Question

我是 glui 的新手。我无法创建 glui 菜单栏。每当我创建 glui 菜单栏时，我都会收到以下错误：

1.cpp:13: error: expected constructor, destructor, or type conversion before ‘*’ token
1.cpp: In function ‘void controlcallback(int)’:
1.cpp:42: error: ‘m’ was not declared in this scope
1.cpp:42: error: expected type-specifier before ‘GLUI_MenuBar’
1.cpp:42: error: expected `;' before ‘GLUI_MenuBar’

来源：

int main_window;
GLUI *w1;
GLUI_Listbox *l1;
GLUI_Button *b1,*b2,*b3,*b4,*b5,*b6,*b7,*b8;
GLUI_Panel *p1,*p2;
enum GLUI_MenuBar *m1;

int id;

void init()
{
    glClearColor(0,1,1,0);
}

void display()
{
    glClear(GL_COLOR_BUFFER_BIT);
    glFlush();
    glutPostRedisplay();
}

void reshape (int w, int h)
{ 
    GLUI_Master.auto_set_viewport(); 
}

 void  controlcallback( int val)
{ 

    if( val == 1) {
        w1->set_main_gfx_window(main_window);
        m=new GLUI_MenuBar(p1);
    } else {
        w1->set_main_gfx_window(main_window);
    }
}

int main(int a, char **b)
{
    glutInit(&a,b);
    glutInitWindowSize(3000,3000);
    glutInitWindowPosition(0,0);
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);

    main_window = glutCreateWindow("  practice");
    init();
    glutDisplayFunc(display);


    GLUI_Master.set_glutReshapeFunc(reshape);
    w1=GLUI_Master.create_glui_subwindow(main_window,GLUI_SUBWINDOW_TOP);
    id=w1->get_glut_window_id();
    p1=w1->add_panel("",GLUI_PANEL_RAISED);
    b1=w1->add_button_to_panel(p1,"navigator",1,controlcallback);
    w1->add_column_to_panel(p1,true);
    b2=w1->add_button_to_panel(p1,"naigator",2,controlcallback);
    w1->add_column_to_panel(p1,true);
    b3=w1->add_button_to_panel(p1,"navigator",3,controlcallback);
    w1->add_column_to_panel(p1,true);
    b4=w1->add_button_to_panel(p1,"naigator",4,controlcallback);
    w1->add_column_to_panel(p1,true);
    b5=w1->add_button_to_panel(p1,"navigator",5,controlcallback);
    w1->add_column_to_panel(p1,true);
    b6=w1->add_button_to_panel(p1,"naigator",6,controlcallback);
    w1->add_column_to_panel(p1,true);
    b7=w1->add_button_to_panel(p1,"navigator",7,controlcallback);
    w1->add_column_to_panel(p1,true);
    b8=w1->add_button_to_panel(p1,"naigator",8,controlcallback);
    w1->add_column_to_panel(p1,true);
    GLUI_MenuBar *m1 = new GLUI_MenuBar(id,GLUI_SUBWINDOW_TOP);

    w1->set_main_gfx_window(main_window);
    glutMainLoop();
}

Answer 1

好吧，该错误与编译器报告的完全一样 1.cpp:42: error: 'm' was not returned in this scope 因为 m 实际上没有在任何地方声明。

另一个错误 1.cpp:13: error: Expected constructor, destructor, or type conversion before '*' token 听起来像是您忘记为 GLUI_Listbox 包含一些 glui 标头。

顺便说一句，您正在使用 GLUI_MenuBar *m1 = new GLUI_MenuBar(id,GLUI_SUBWINDOW_TOP); 隐藏全局变量 m1 。