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我似乎無法獲得一些C++代碼來編譯。我翻轉顯示的方向,但VS2008告訴我的DMDO_90和DMDO_270身份不明:C++更改屏幕方向問題 - DEVMODE dmDisplayOrientation DMDO_90 undefined
error C2065: 'DMDO_90' : undeclared identifier
error C2065: 'DMDO_270' : undeclared identifier
我缺少something--一個包括什麼? 按照MSDN DEVMODE結構DMDO應(下dmDisplayOrientation部分)來定義 -
這裏是我的代碼有:
#include <iostream>
#include <string>
#include <windows.h>
using namespace std;
DISPLAY_DEVICE GetPrimaryDevice()
{
int index=0;
DISPLAY_DEVICE dd;
dd.cb = sizeof(DISPLAY_DEVICE);
while (EnumDisplayDevices(NULL, index++, &dd, 0))
{
if (dd.StateFlags & DISPLAY_DEVICE_PRIMARY_DEVICE) return dd;
}
return dd;
}
BOOL SetDisplayResolution(long degrees)
{
DISPLAY_DEVICE dd = GetPrimaryDevice();
DEVMODE dm;
ZeroMemory(&dm, sizeof(dm));
dm.dmSize = sizeof(DEVMODE);
if (!EnumDisplaySettings(dd.DeviceName, ENUM_CURRENT_SETTINGS, &dm))
{
printf("EnumDisplaySettings failed:%d\n", GetLastError());
return FALSE;
}
switch(degrees)
{
case 90:
dm.dmDisplayOrientation = DMDO_90; //error C2065: 'DMDO_90' : undeclared identifier
break;
case 270:
dm.dmDisplayOrientation = DMDO_270; //error C2065: 'DMDO_90' : undeclared identifier
break;
default:
break;
}
DWORD dwTemp = dm.dmPelsHeight;
dm.dmPelsHeight = dm.dmPelsWidth;
dm.dmPelsWidth = dwTemp;
dm.dmFields = (DM_PELSWIDTH | DM_PELSHEIGHT);
if (ChangeDisplaySettings(&dm, CDS_TEST) !=DISP_CHANGE_SUCCESSFUL)
{
printf("\nIllegal graphics mode: %d\n", GetLastError());
return FALSE;
}
return (ChangeDisplaySettings(&dm, 0)==DISP_CHANGE_SUCCESSFUL);
}
int main()
{
if (SetDisplayResolution(90))
{
return true;
}
else
{
return false;
}
}
感謝保羅,即固定它。 – user1211653 2014-09-04 11:38:40