public WindowFactory(string existingClassName, string targetClassName,
IntPtr srcInstanceHandle, IntPtr targetInstanceHandle,
ClassInfoMutator mutator)
{
WindowClassExBlittable classInfo;
if (!User32Methods.GetClassInfoEx(srcInstanceHandle, existingClassName, out classInfo))
{
throw new Exception("Class is not registered - " + existingClassName);
}
var className = targetClassName ?? Guid.NewGuid().ToString();
var ciClassName = Marshal.SystemDefaultCharSize == 1
? Marshal.StringToHGlobalAnsi(className)
: Marshal.StringToHGlobalUni(className);
classInfo.Size = (uint)Marshal.SizeOf <WindowClassExBlittable>();
classInfo.ClassName = ciClassName;
classInfo.InstanceHandle = targetInstanceHandle;
try
{
mutator?.Invoke(ref classInfo);
this.ClassName = className;
this.InstanceHandle = classInfo.InstanceHandle;
this.m_windowProc = Marshal.GetDelegateForFunctionPointer <WindowProc>(classInfo.WindowProc);
classInfo.WindowProc = Marshal.GetFunctionPointerForDelegate <WindowProc>(this.ClassInitializerProc);
this.RegisterClass(ref classInfo);
}
finally {
Marshal.FreeHGlobal(ciClassName);
}
}