多个键无效

Question

我通过使用freeglut函数面临密钥问题.所有按键都正常工作,除了ctrl+alt+D.我不知道为什么它不起作用我做错了.
这是代码:

#include<iostream>
#include<cstdlib>
#include <GL\freeglut.h>
using namespace std;

void Display(void) {
    glClear(GL_COLOR_BUFFER_BIT);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    glEnd();
    glFlush();
}

void SpecialKeys(int key, int xpos, int ypos) {

    if (key == GLUT_KEY_UP) {
        cout << "up key press" << endl;
    }

    else if (key == GLUT_KEY_DOWN) {

        cout << "down key press" << endl;
    }

    else if (key == GLUT_KEY_RIGHT) {

        cout << "Right key press" << endl;

    }
    else if (key == GLUT_KEY_LEFT) {

        cout << "left key press" << endl;

    }
    glutPostRedisplay();
}

void KeysFun(unsigned char key, int xpos, int ypos) {

    if (key == 'a' || key == 'a') {
        cout << "A Key press" << endl;
    }

    else if (key == 's' || key == 'S') {

        int mod = glutGetModifiers();

        if (mod == GLUT_ACTIVE_ALT) {

            cout << "Alt+S press" << endl;
        }

    }

    else if (key == 'd' || key == 'D') {

        int mod = glutGetModifiers();
        int mod2 = glutGetModifiers();
        if (mod == GLUT_ACTIVE_CTRL && mod2== GLUT_ACTIVE_ALT) {

            cout << "CTRL+Alt+D press" << endl;
        }

    }

    glutPostRedisplay();
}

void init(void) {

    glClearColor(0.0f,0.0f,0.0f,0.0f);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0);

}


int main(int argc, char**argv) {

    glutInit(&argc, argv);
    glutCreateWindow("Frame");
    init();
    glutDisplayFunc(Display);
    glutKeyboardFunc(KeysFun);
    glutSpecialFunc(SpecialKeys);
    glutMainLoop();

    return EXIT_SUCCESS;
}

Answer 1

当你按CTRL + D key不等于'd' or 'D'它等于EOT结束传输并等于此key == 0x04(这里有更多信息)所以你需要添加你的if表达式else

if (key == 'd' || key == 'D' || key == 0x04)

接下来当您按下ALT并同时按CTRL glutGetModifiers()将返回以下任何符号位掩码的组合:GLUT_ACTIVE_CTRL GLUT_ACTIVE_ALT ...更多信息在这里

如果按下按钮d的按钮可能如下所示:

else if (key == 'd' || key == 'D' || key == 0x04) {
    int mod = glutGetModifiers();
    if (mod == (GLUT_ACTIVE_CTRL|GLUT_ACTIVE_ALT)) {
      cout << "CTRL+Alt+D press" << endl;
    }
}

在Linux上适用于我.