directx 11 change texture using PSSetShaderResources - c++

Question

Hi I am just learning directx11 and have come across a problem with PSSetShaderResources
if I change textures before the call to swapchain->Present only the first texture is displayed.
if I change textures between Present calls both are displayed but on consecutive frames.
Is there anyway of changing textures with PSSetShaderResources so I can use both (or more) on a single frame?
I know I can use texture arrays but it appears to me that you must have same size textures?
also I could upload two textures (or more) at a time but I would then have to have conditional statements within shader.
Below is the drawing loop I am using. And the simple shader that I am using
any help would be appreciated.
Paul
24OCT2014
tempBool = false;
for (int j = 0; j < 2; j++) //change 2 to texCount
{
devcon->UpdateSubresource(pConstantBuffer, 0, NULL, &cb, 0, 0);
devcon->VSSetConstantBuffers(0, 1, &pConstantBuffer);
devcon->PSSetConstantBuffers(0, 1, &pConstantBuffer);
tempBool = !tempBool;
if (tempBool)
{
devcon->PSSetShaderResources(0, 1, &pTex[0]);
}
else
{
devcon->PSSetShaderResources(0, 1, &pTex[1]);
}
for (int i = 0; i < texRun[j]; i++)
{
devcon->Draw(obLens[curPos+i], obStarts[curPos+i]);
}
curPos += texRun[j];
}
swapchain->Present(0, 0);
Texture2D txDiffuse : register( t0 );
SamplerState samLinear : register( s0 );
cbuffer ConstantBuffer : register( b0 )
{
matrix World;
matrix View;
matrix Projection;
float4 vLightDir;
float4 vLightColor;
};
struct VOut
{
float4 Pos : SV_POSITION;
float3 Norm : NORMAL;
float2 Tex : TEXCOORD;
};
VOut VShader(float4 position : POSITION, float3 Norm : NORMAL, float2 Tex : TEXCOORD)
{
VOut output = (VOut)0;
output.Pos = mul( position, World );
output.Pos = mul( output.Pos, View );
output.Pos = mul( output.Pos, Projection );
output.Norm = mul(Norm, World);
output.Tex = Tex;
return output;
}
float4 PShader0(float4 position : SV_POSITION, float3 Norm : NORMAL,
float2 Tex : TEXCOORD ) : SV_TARGET
{
float4 diffuse = 0;
diffuse = txDiffuse.Sample( samLinear, Tex );
float4 finalColor = 0;
finalColor = diffuse; // * 0.2;
finalColor += saturate( dot((float3)vLightDir,Norm) * diffuse);
finalColor.a = 1.0;
return finalColor;
}

Answer 1

Finally tracked down the error it was in my object loading code and nothing to do width direct3d
I was Loading second lot of objects over the first lot
for first lot of objects I am reading into verts which is my vertex data pointer
for the second lot I was also reading into verts instead of &verts[firstVertsCount]
anyway thanks for the help
Paul