改变分辨率的问题(今天结帐)

Question

是何异常？也许是内存不够吧。或者是要在FillMemory之前加上pdm=new DEVMODE;

Answer 1

int  wd,hd;
    DEVMODE  dm;
      FillMemory  (&dm,  sizeof(DEVMODE),0);//此处异常
        dm.  dmSize  =  sizeof(DEVMODE);
      wd=GetSystemMetrics(SM_CXSCREEN);
      hd=GetSystemMetrics(SM_CYSCREEN);
      if(wd==1024&  &  hd==768)
      {
        
        dm.dmPelsWidth=1024;
                            dm.  dmPelsHeight=768;
                        dm.  dmFields=DM_PELSWIDTH|DM_PELSHEIGHT  ;
          ChangeDisplaySettingsEx(NULL,& dm,NULL,CDS_RESET,NULL);
      }

Answer 2

BOOL flag;
 LPDEVMODE  gpCurrentMode,gpNewMode;
 gpCurrentMode = new DEVMODE;
 flag = EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, gpCurrentMode);
 gpCurrentMode->dmFields = DM_BITSPERPEL | DM_PELSWIDTH | DM_PELSHEIGHT | DM
_DISPLAYFLAGS | DM_DISPLAYFREQUENCY ;
 gpCurrentMode->dmBitsPerPel = 24;
 gpCurrentMode->dmPelsWidth = 1024;
 gpCurrentMode->dmPelsHeight = 768;
 gpCurrentMode->dmDisplayFrequency = 0;
 if ((DM_BITSPERPEL      & gpCurrentMode->dmFields ||
          DM_PELSWIDTH      & gpCurrentMode->dmFields ||
          DM_PELSHEIGHT      & gpCurrentMode->dmFields ||
          DM_DISPLAYFLAGS  & gpCurrentMode->dmFields ||
          DM_DISPLAYFREQUENCY & gpCurrentMode->dmFields ) )
    {
  gpNewMode = gpCurrentMode;
    LONG lResult = ChangeDisplaySettings
                ( gpNewMode,
                  CDS_TEST );
  if (lResult == DISP_CHANGE_RESTART)
    {
        MessageBox("This mode requires a reboot which\n"  \
                         "is not supported in this sample.",
               NULL);
  }
  if (DISP_CHANGE_SUCCESSFUL ==lResult)
  {
         lResult = ChangeDisplaySettings
                     ( gpCurrentMode,
                       0 );
  }
 }