How to make clone or extended mode

问题

I am having multiple monitors(virtual+real) and by default I wanted to put it in clone/dual mode from my program. Can some one suggest how do I achieve this? I am very new to this world:) sorry for this basic question.... even any doc or any link will be highly appreciable.

/sarbojit

回答1:

To set clone displays in Win7, this will work if there are 2 paths and 4 modes

UINT32 cPath=0;  //path count
UINT32 cMode=0;  //mode count
HRESULT hr;
hr = GetDisplayConfigBufferSizes(QDC_ALL_PATH, &cPath, &cMode);
std::vector<DISPLAYCONFIG_PATH_INFO> pathArray(cPath);
std::vector<DISPLAYCONFIG_MODE_INFO> modeArray(cMode);
hr =QueryDisplayConfig(QDC_ALL_PATHS, &cPath, &pathArray[0], &cMode, &modeArray[0], NULL);
if(hr != ERROR_SUCCESS) { problem in paradise }
if(cPath!=2 || cMode != 4) { anything else is too complex or a single display or already cloned }
// to change resolution also
// int ix=pathArray[0].sourceInfo.modeInfoIdx;  assuming path[0] is primary, it should be
// modeArray[ix].sourceMode.width = 320;       // :(
// modeArray[ix].sourceMode.hieght = 240;      // :(
pathArray[1].flags |= DISPLAYCONFIG_PATH_ACTIVE;
pathArray[1].sourceInfo.modeIdx = pathArray[0].sourceInfo.modeIdx;   //same source
pathArray[1].sourceInfo.id = pathArray[0].sourceInfo.id;       //same source
hr = SetDisplayConfig(cPath, &pathArray[0], cMode, &modeArray[0], SDC_APPLY | SDC_USE_SUPPLIED_DISPLAY_CONFIG | SDC_ALLOW_CHANGE | SDC_SAVE_TO_DATABASE));
if(hr != ERROR_SUCCESS) { so close!!! }

回答2:

Changing display settings programmatically
Example of attaching a monitor and its issues in earlier version of Windows

回答3:

//Extend
SetDisplayConfig(0, NULL,0, NULL,(SDC_APPLY | SDC_TOPOLOGY_EXTEND));
//Clone
SetDisplayConfig(0, NULL,0, NULL,(SDC_APPLY | SDC_TOPOLOGY_CLONE));

For more information: http://msdn.microsoft.com/en-us/library/ff569533%28v=VS.85%29.aspx

回答4:

If you happen to be on Windows XP and have an NVIDIA card you can use the following command line command

rundll32.exe NvCpl.dll,dtcfg setview 1 clone

rundll32.exe NvCpl.dll,dtcfg setview 1 dualview

and use CreateProcess to create a child process which runs that command. I have been unable to get NvAPI to set up clone or extended mode on Windows XP, but it seems to run fine on Windows 7.

来源：https://stackoverflow.com/questions/3625983/how-to-make-clone-or-extended-mode

标签

c++

winapi

windows-7