Question

我试图找回号码。监视器连接到CPU。

假设我有一个系统，其中4个输出连接在拉伸模式，所有4个输出一起显示为单个屏幕。当我使用以下任何一种方法查询连接的输出计数时，我得到响应为＆＃34; 1＆＃34;。

＆＃34; EnumDisplayDevicesA＆＃34;方法仅将DISPLAY_DEVICE.StateFlag作为DISPLAY_DEVICE_ATTACHED_TO_DESKTOP返回给一个显示器。
＆＃34; EnumDisplayMonitors（NULL，NULL，MonitorEnumProc，（LPARAM）＆amp; Count）＆＃34;方法还返回1个连接的输出
GetSystemMetrics（SM_CMONITORS）方法也返回1个连接输出

是否有任何规定来确定号码。监视器是否连接，无论其连接的模式如何？

最终，我需要知道的是，有多少监视器连接到系统，无论其配置模式如何。

当在个人/扩展模式下连接3个显示器（对于QUAD输出PC）时，我得到以下输出：

Device: \\.\DISPLAY1 is active. Flags: 5
Device: \\.\DISPLAY1 is primary. Flags: 5
Device: \\.\DISPLAY1 is attached to the desktop. Flags: 5
Device: \\.\DISPLAY2 is active. Flags: 1
Device: \\.\DISPLAY2 is attached to the desktop. Flags: 1
Device: \\.\DISPLAY3 is active. Flags: 1
Device: \\.\DISPLAY3 is attached to the desktop. Flags: 1
Device: \\.\DISPLAY4 is not attached. Flags: 0
Device: \\.\DISPLAYV1 is a mirroring driver device. Flags: 8
Device: \\.\DISPLAYV2 is a mirroring driver device. Flags: 8
4 monitors detected, 3 attached to the desktop, mirroring devices: 2

当在跨度/拉伸/重复模式下连接相同的3个显示器（对于QUAD输出PC）时，我会低于输出：

Device: \\.\DISPLAY1 is active. Flags: 5
Device: \\.\DISPLAY1 is primary. Flags: 5
Device: \\.\DISPLAY1 is attached to the desktop. Flags: 5
Device: \\.\DISPLAY2 is not attached. Flags: 0
Device: \\.\DISPLAY3 is not attached. Flags: 0
Device: \\.\DISPLAY4 is not attached. Flags: 0
Device: \\.\DISPLAYV1 is a mirroring driver device. Flags: 8
Device: \\.\DISPLAYV2 is a mirroring driver device. Flags: 8
4 monitors detected, 1 attached to the desktop, mirroring devices: 2

我的代码片如下所示：

// I need to get the address of a few multi-monitor functions
//
HMODULE user32 = GetModuleHandle ("User32.DLL");
typedef BOOL WINAPI tEnumDisplayDevices (void*, DWORD, DISPLAY_DEVICE*, DWORD);
tEnumDisplayDevices* fEnumDisplayDevices = (tEnumDisplayDevices*) GetProcAddress (user32, "EnumDisplayDevicesA");
if (fEnumDisplayDevices == NULL) return false;

/*int fResult;
fResult = GetSystemMetrics(SM_CMONITORS);*/

// count the number of monitors attached to the system
//
int numMirrorDevices = 0, numMonitorsAttached = 0, numMonitorsTotal = 0;
DISPLAY_DEVICE dd;  dd.cb = sizeof(dd);
for (DWORD dev=0;  fEnumDisplayDevices (NULL, dev, &dd, 0);  ++dev)
{
    if (dd.StateFlags & DISPLAY_DEVICE_ACTIVE)
    {
        LOG_INFO (funcName << ": Device: " << dd.DeviceName << " is active. Flags: " << dd.StateFlags);
    }
    if (dd.StateFlags & DISPLAY_DEVICE_PRIMARY_DEVICE)
    {
        LOG_INFO (funcName << ": Device: " << dd.DeviceName << " is primary. Flags: " << dd.StateFlags);
    }
    if (dd.StateFlags & DISPLAY_DEVICE_REMOVABLE)
    {
        LOG_INFO (funcName << ": Device: " << dd.DeviceName << " is removable. Flags: " << dd.StateFlags);
    }
    if (dd.StateFlags & DISPLAY_DEVICE_VGA_COMPATIBLE)
    {
        LOG_INFO (funcName << ": Device: " << dd.DeviceName << " is VGA. Flags: " << dd.StateFlags);
    }
    if (dd.StateFlags & DISPLAY_DEVICE_MODESPRUNED)
    {
        LOG_INFO (funcName << ": Device: " << dd.DeviceName << " is more dsiplay modes. Flags: " << dd.StateFlags);
    }
    if (dd.StateFlags & DISPLAY_DEVICE_MIRRORING_DRIVER)
    {
        LOG_INFO (funcName << ": Device: " << dd.DeviceName << " is a mirroring driver device. Flags: " << dd.StateFlags);
        numMirrorDevices++;
        continue;
    }
    if (dd.StateFlags & DISPLAY_DEVICE_ATTACHED_TO_DESKTOP)
    {
        LOG_INFO (funcName << ": Device: " << dd.DeviceName << " is attached to the desktop. Flags: " << dd.StateFlags);
        numMonitorsAttached++;
    }
    else
    {
        LOG_INFO (funcName << ": Device: " << dd.DeviceName << " is not attached. Flags: " << dd.StateFlags);
    }
    numMonitorsTotal++;
}

LOG_INFO (funcName << ": " << numMonitorsTotal << " monitors detected, " << numMonitorsAttached 
    << " attached to the desktop, mirroring devices: " << numMirrorDevices);

请指导我确定合适的显示器数量。

如何检索拉伸/跨度模式的连接监视器？

0 个答案: