类的头:静态函数访问类的成员
#ifndef _APP_H_
#define _APP_H_
#include "glut.h"
#include "Declare.h"
class App {
private:
static float angle;
public:
App();
int OnExecute();
void OnLoop();
static void OnRender();
bool OnInit();
void OnCleanup();
static void OnResize(int w, int h);
};
#endif
我的OnRender的定义是
#include "App.h"
App::App() {
angle = 0.0f;
}
void App::OnRender() {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
gluLookAt(0.0f, 0.0f, 10.0f,
0.0f, 0.0f, 0.0f,
0.0f, 1.0f, 0.0f);
glRotatef(angle, 0.0f, 1.0f, 0.0f);
glBegin(GL_TRIANGLES);
glVertex3f(-2.0f,-2.0f,0.0f);
glVertex3f(2.0f,0.0f,0.0f);
glVertex3f(0.0f,2.0f,0.0f);
glEnd();
angle+=0.1f;
glutSwapBuffers();
}
错误:
1>App.obj : error LNK2001: unresolved external symbol "private: static float App::angle" ([email protected]@@0MA)
1>App_OnRender.obj : error LNK2019: unresolved external symbol "private: static float App::angle" ([email protected]@@0MA) referenced in function "public: static void __cdecl App::OnRender(void)" ([email protected]@@SAXXZ)
事做如何,我引用静态静态函数内部的变量。如果我没有将角度声明为static float angle
那么我当然无法通过static void OnRender()
访问它。我必须添加更多细节。如果我不把它声明为静态的,我得到这个错误illegal reference to non-static member App::angle
[关于静态类成员解析外部符号]的可能重复(http://stackoverflow.com/questions/195207/unresolved-external-symbol-on-static-class-members) –