ID3DXTextureShader::GetConstantByName
    Gets a constant by looking up its name.
            
		
        
D3DXHANDLE GetConstantByName(
  D3DXHANDLE hConstant,
  LPCSTR pName
);
    
Parameters
      - hConstant
- [in]  A handle to the parent data structure. If the constant is a top-level parameter (there is no parent data structure), use NULL.
- pName
- [in]  A string containing the name of the constant.
Return Values
Returns a unique identifier to the constant.
Requirements
  Header: Declared in D3dx9shader.h.