Direct2D中DirectWrite处理WM_SIZE消息

对于DirectWrite程序，在窗口大小改变时，也要同步更新render target的尺寸，否则的话，所绘文本可能超出窗口之外。可以定义一个OnResize函数来更新render target的尺寸，然后再WM_SIZE中调用这个函数。

// When window size changed, we need to resize the render target as wellVOID OnResize(UINT width, UINT height){    if(g_pRenderTarget)    {        D2D1_SIZE_U size = D2D1::SizeU(width, height);        g_pRenderTarget->Resize(size);    }}

调用

case WM_SIZE:    {        UINT width = LOWORD(lParam);        UINT height = HIWORD(lParam);        OnResize(width, height);        break;    }