c++ opengl when i render object it doesn't rendering

I'm writting opengl code on c++ and I create an own class of object. But for some reason it doesn't rendering. I think problem in vector, which I use as coordinates of vertex. And i 100% sure problem is not in shaders.

Here is a code:

source.cpp

    //other shader code

    GLobject obj(Points);
    obj.SetBufferData(0, GL_ARRAY_BUFFER, 2, GL_FALSE);

    glClearColor(0.3, 0.5, 0.7, 1);

    while (!glfwWindowShouldClose(window)) {
        glfwSwapBuffers(window);

        glClear(GL_COLOR_BUFFER_BIT);

        glUseProgram(ShaderProgram);

        obj.Draw(0, GL_ARRAY_BUFFER, GL_TRIANGLES, 2);
    }
}

GLobject.cpp

#include "GLobject.h"

GLobject::GLobject(float points[])
{
    glGenVertexArrays(1, &this->VAO);
    glGenBuffers(1, &this->VBO);

    for (int i = 0; i < sizeof(points); i++)
        this->points.push_back(points[i]);

    p = this->points.data();
}

GLobject::~GLobject()
{
}

void GLobject::SetBufferData(int index, GLenum btype, int size, GLenum normalize)
{
    glBindVertexArray(this->VAO);
    glBindBuffer(btype, this->VBO);
    glVertexAttribPointer(index, size, GL_FLOAT, normalize, size*sizeof(float), (void*)0);

    glBufferData(btype, sizeof(p), p, GL_STATIC_DRAW);

    glBindVertexArray(0);
    glBindBuffer(btype, 0);
}

void GLobject::Draw(int index, GLenum btype, GLenum dtype, int size) {
    glBindVertexArray(this->VAO);
    glBindBuffer(btype, this->VBO);

    glEnableVertexAttribArray(index);

    glDrawArrays(dtype, 0, sizeof(p) / size);
}

I'm be very happy if you help me.

P.S. I'm from Ukraine so my English may be bad.