OpenGL -- glfwSetWindowUserPointer()

最新推荐文章于 2025-11-16 02:26:01 发布

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原文链接：https://stackoverflow.com/questions/27596861/give-static-function-access-to-data-without-passing-the-data-as-a-parameter

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本文介绍如何使用glfwSetWindowUserPointer()将自定义数据指针与窗口关联，以便在回调函数中通过glfwGetWindowUserPointer()检索。这种方法避免了在回调函数参数中显式传递数据的需要。

Use glfwSetWindowUserPointer() to associate your wrapper pointer to the window before you register your callback. When your callback is called, you can use glfwGetWindowUserPointer() to retrieve it.

https://stackoverflow.com/questions/27596861/give-static-function-access-to-data-without-passing-the-data-as-a-parameter

glfwSetWindowUserPointer()定义在window.c

GLFWAPI void glfwSetWindowUserPointer(GLFWwindow* handle, void* pointer)
{
    _GLFWwindow* window = (_GLFWwindow*) handle;
    assert(window != NULL);

    _GLFW_REQUIRE_INIT();
    window->userPointer = pointer;
}

GLFWAPI void* glfwGetWindowUserPointer(GLFWwindow* handle)
{
    _GLFWwindow* window = (_GLFWwindow*) handle;
    assert(window != NULL);

    _GLFW_REQUIRE_INIT_OR_RETURN(NULL);
    return window->userPointer;

通过glfwSetWindowUserPointer()把需要的data以指针的方式传递给window。

当需要在callBack函数中获取data时，调用glfwGetWindowUserPointer()