Question

我希望窗口标题在窗口调整大小时自动更新。它应该采用一种格式，以便显示标题窗口大小 - [宽度] x [高度] 但结果我得到一个标题显示_alloca已损坏。

int main(void)
{
    GLFWwindow *window = NULL; //initialise window with pointer to GLFW handle
    glfwSetErrorCallback(error_callback);

    //initialise GLFW
    if (!glfwInit())
    {
        //if failed to initialise GLFW
        exit(EXIT_FAILURE);
    }
    //minimum OpenGL version 3.3
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);

    //create the window here
    window = glfwCreateWindow(WINDOW_WIDTH, WINDOW_HEIGHT, "Window Size - " + WINDOW_WIDTH + "x" + WINDOW_HEIGHT, NULL, NULL);

    //if window fail, terminate GLFW
    if (window == NULL)
    {
        glfwTerminate();
        exit(EXIT_FAILURE);
    }

    glfwMakeContextCurrent(window); // set window context as the current context
    glfwSwapInterval(1);            // swap buffer interval

    // initialise GLEW
    if (glewInit() != GLEW_OK)
    {
        // if failed to initialise GLEW
        cerr << "GLEW initialisation failed" << endl;
        exit(EXIT_FAILURE);
    }

    //set key callback function
    glfwSetKeyCallback(window, key_callback);

    //render loop
    while (!glfwWindowShouldClose(window))
    {
        glClear(GL_COLOR_BUFFER_BIT);

        glfwSwapBuffers(window);    //swap buffers
        glfwPollEvents();           //poll for events
    }

    //close window, terminate GLFW
    glfwDestroyWindow(window);
    glfwTerminate();
    exit(EXIT_SUCCESS);
}

Answer 1

正如@NicoleBolas已经在评论中提到的，有问题的部分是

"Window Size - " + WINDOW_WIDTH + "x" + WINDOW_HEIGHT

这是合法的C ++，但没有按照您的预期执行。此处WINDOW_WIDTH的值会添加到"Window Size"常量的地址中。结果是一个新指针，它指向一个无效的内存地址。

如果要将宽度和高度附加为文本，则必须先将数字转换为文本，然后将结果字符串连接起来。一种简单的方法是使用stringstream：

std::stringstream s;
s << "Window Size - " << WINDOW_WIDTH << "x" << WINDOW_HEIGHT;

window = glfwCreateWindow(WINDOW_WIDTH, WINDOW_HEIGHT, s.str().c_str(), NULL, NULL);

调整大小时更新标题中的窗口尺寸

1 个答案: