OpenGL显示空白屏幕。也许是因为着色器？

My OpenGL ES application isn't working. I'm using SDL for windowing management, and it holds the context. After looking around, I noticed that the vertex shader and the fragment shader showed up as 0 on the debugger. Even the program was 0. Could this be a reason? I followed my shader compiling and linking code to a template that was previously made.My OpenGL ES application isn't working. I'm usi