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screen coordinate not working with pixel values

I have a very simple effect file shown below. I am using this to draw 2D lines, however it is not behaving how I expected and I can't seem to get my head round why. If I draw a line that goes from ...
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1answer
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HLSL: how to get/set effectvariable to an array of structs with Direct3D10

HLSL Code: //Lights struct Light { float3 pos; float3 dir; int type; } m_aLights[3]; How can I get/set an effectvariable to m_aLights with Direct3D10? Thanks