多个键不工作

本文介绍了多个键不工作的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我通过使用 freeglut 函数面临键的问题。除了 ctrl + alt + D ，所有键都可以正常工作。我不知道为什么它不工作我做错了。

这是代码：

I am facing a problem with keys by using freeglut functions. All keys are working fine except ctrl+alt+D. I don't know why it's not working what I'm doing wrong.
This is Code:

#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;
}

推荐答案

键不等于'd'或'D'它等于EOT传输结束， code> key == 0x04 （更多）所以你需要添加到你的if表达式else

When you press CTRL+D key doesn't equal 'd' or 'D' it equals to EOT End of transmission and equal to this key == 0x04 (more info here) so you need add to your if expression else

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

下一步同时按ALT和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

next when you press ALT and CTRL simultaneously glutGetModifiers() will return you combination of any of the following symbolic bitmasks: GLUT_ACTIVE_CTRL GLUT_ACTIVE_ALT... more info here

因此，如果按钮d的按钮可能看起来像这样：

resulting if block for button d press may look like this:

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。

Works for me on Linux.

这篇关于多个键不工作的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！

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