How to detect Windows Aero theme on Delphi 7?

Question

您如何通过Delphi 7上的代码检测到用户正在其操作系统上运行Windows Aero主题？

Answer 1

The function we need to use is Dwmapi.DwmIsCompositionEnabled , but that is not included in the Windows header translations that ship with Delphi 7 and was added in Vista, released after Delphi 7. Also it crashes the application on Windows XP - so call it after check if Win32MajorVersion >= 6 .

function IsAeroEnabled: Boolean;
type
  TDwmIsCompositionEnabledFunc = function(out pfEnabled: BOOL): HRESULT; stdcall;
var
  IsEnabled: BOOL;
  ModuleHandle: HMODULE;
  DwmIsCompositionEnabledFunc: TDwmIsCompositionEnabledFunc;
begin
  Result := False;
  if Win32MajorVersion >= 6 then // Vista or Windows 7+
  begin
    ModuleHandle := LoadLibrary('dwmapi.dll');
    if ModuleHandle <> 0 then
    try
      @DwmIsCompositionEnabledFunc := GetProcAddress(ModuleHandle, 'DwmIsCompositionEnabled');
      if Assigned(DwmIsCompositionEnabledFunc) then
        if DwmIsCompositionEnabledFunc(IsEnabled) = S_OK then
          Result := IsEnabled;
    finally
      FreeLibrary(ModuleHandle);
    end;
  end;
end;