USE opengl load stl file problem(qml)

[lightwind]

Hello! I'm trying to load stl file by qtquick & opengl.
Now I can load a triangle. But how can I load complete .stl file by this framework?
I have tried add more points in vertices. Changed the setAttributeBuffer() function's value. But I still can't get more triangles.

void TriangleRender::initializeTriangle()
{
    VertexData vertices[] =
    {
        { QVector3D(-0.5f, -0.5f, 0.0f), QVector3D(1.0, 0.0, 0.0) },
        { QVector3D(0.0f, 0.5f, 0.0f),   QVector3D(0.0, 1.0, 0.0) },
        { QVector3D(0.5f, -0.5f, 0.0f),  QVector3D(0.0, 0.0, 1.0) }
    };

    m_vbo.create();

    m_vbo.bind();
    m_vbo.allocate(vertices, 3 * sizeof (VertexData));
}

void TriangleRender::render()
{
    static float angle = 0.0;

    glClearColor(0.2, 0.3, 0.3, 1.0);
    glClear(GL_COLOR_BUFFER_BIT);

    angle += 1.0f;
    QMatrix4x4 modelMatrix;
    modelMatrix.translate(0.0, 0.0, -5.0);
    modelMatrix.rotate(angle, 0.0f, 1.0f, 0.0f);

    m_program.bind();
    m_program.setUniformValue("mvp",  m_projection * modelMatrix);

    m_vbo.bind();

#ifdef Q_OS_WIN
    int location = 0;
    //position
    m_program.enableAttributeArray(location);
    m_program.setAttributeBuffer(location, GL_FLOAT, 0, 3, sizeof(VertexData));
    //color
    m_program.enableAttributeArray(location + 1);
    m_program.setAttributeBuffer(location + 1, GL_FLOAT, sizeof(QVector3D), 3, sizeof(VertexData));

#else
    int vertexLocation = m_program.attributeLocation("position");
    m_program.enableAttributeArray(vertexLocation);
    m_program.setAttributeBuffer(vertexLocation, GL_FLOAT, 0, 3, sizeof(VertexData));

    int colorLocation = m_program.attributeLocation("color0");
    m_program.enableAttributeArray(colorLocation);
    m_program.setAttributeBuffer(colorLocation, GL_FLOAT, sizeof(QVector3D), 3, sizeof(VertexData));
#endif

    glDrawArrays(GL_TRIANGLES, 0, 3);
}

GLSL:

#version 330 core

layout (location = 0) in vec4 position;
layout (location = 1) in vec3 color0;

out vec3 color;
uniform mat4 mvp;

void main(void)
{
    gl_Position = mvp * position;
    color = color0;
}