这是Qt6.2.4版本的多屏代码，在同一品牌和同一型号时会存在BUG.
以下是Qt6.2.3的代码，经检查Qt5.15.2/Qt6.2.5/Qt6.8.2都不会存在该BUG
static bool monitorData(HMONITOR hMonitor, QWindowsScreenData *data)
{
MONITORINFOEX info;
memset(&info, 0, sizeof(MONITORINFOEX));
info.cbSize = sizeof(MONITORINFOEX);
if (GetMonitorInfo(hMonitor, &info) == FALSE)
return false;
data->hMonitor = hMonitor;
data->geometry = QRect(QPoint(info.rcMonitor.left, info.rcMonitor.top), QPoint(info.rcMonitor.right - 1, info.rcMonitor.bottom - 1));
data->availableGeometry = QRect(QPoint(info.rcWork.left, info.rcWork.top), QPoint(info.rcWork.right - 1, info.rcWork.bottom - 1));
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问题在这行开始，它通过getPathInfo()获取一个友名，然后如果是相同品牌且同一型号时，其友名是相同的。从而导致data->name被初始化为友名。
DISPLAYCONFIG_PATH_INFO pathInfo = {};
const bool hasPathInfo = getPathInfo(info, &pathInfo);
if (hasPathInfo) {
DISPLAYCONFIG_TARGET_DEVICE_NAME deviceName = {};
deviceName.header.type = DISPLAYCONFIG_DEVICE_INFO_GET_TARGET_NAME;
deviceName.header.size = sizeof(DISPLAYCONFIG_TARGET_DEVICE_NAME);
deviceName.header.adapterId = pathInfo.targetInfo.adapterId;
deviceName.header.id = pathInfo.targetInfo.id;
if (DisplayConfigGetDeviceInfo(&deviceName.header) == ERROR_SUCCESS)
data->name = QString::fromWCharArray(deviceName.monitorFriendlyDeviceName);
}
if (data->name.isEmpty())
data->name = QString::fromWCharArray(info.szDevice);
《《《《《《
if (wcscmp(info.szDevice, L"WinDisc") == 0) {
data->flags |= QWindowsScreenData::LockScreen;
} else {
if (const HDC hdc = CreateDC(info.szDevice, nullptr, nullptr, nullptr)) {
const QDpi dpi = monitorDPI(hMonitor);
data->dpi = dpi.first > 0 ? dpi : deviceDPI(hdc);
data->depth = GetDeviceCaps(hdc, BITSPIXEL);
data->format = data->depth == 16 ? QImage::Format_RGB16 : QImage::Format_RGB32;
data->physicalSizeMM = QSizeF(GetDeviceCaps(hdc, HORZSIZE), GetDeviceCaps(hdc, VERTSIZE));
const int refreshRate = GetDeviceCaps(hdc, VREFRESH);
if (refreshRate > 1) // 0,1 means hardware default.
data->refreshRateHz = refreshRate;
DeleteDC(hdc);
} else {
qWarning("%s: Unable to obtain handle for monitor '%s', defaulting to %g DPI.",
__FUNCTION__, qPrintable(QString::fromWCharArray(info.szDevice)),
data->dpi.first);
} // CreateDC() failed
} // not lock screen
以下是Qt6.2.3的代码，经检查Qt5.15.2/Qt6.2.5/Qt6.8.2都不会存在该BUG：
static bool monitorData(HMONITOR hMonitor, QWindowsScreenData *data)
{
MONITORINFOEX info;
memset(&info, 0, sizeof(MONITORINFOEX));
info.cbSize = sizeof(MONITORINFOEX);
if (GetMonitorInfo(hMonitor, &info) == FALSE)
return false;
data->hMonitor = hMonitor;
data->geometry = QRect(QPoint(info.rcMonitor.left, info.rcMonitor.top), QPoint(info.rcMonitor.right - 1, info.rcMonitor.bottom - 1));
data->availableGeometry = QRect(QPoint(info.rcWork.left, info.rcWork.top), QPoint(info.rcWork.right - 1, info.rcWork.bottom - 1));
data->name = QString::fromWCharArray(info.szDevice);
if (data->name == u"WinDisc") {
data->flags |= QWindowsScreenData::LockScreen;
} else {
if (const HDC hdc = CreateDC(info.szDevice, nullptr, nullptr, nullptr)) {
const QDpi dpi = monitorDPI(hMonitor);
data->dpi = dpi.first > 0 ? dpi : deviceDPI(hdc);
data->depth = GetDeviceCaps(hdc, BITSPIXEL);
data->format = data->depth == 16 ? QImage::Format_RGB16 : QImage::Format_RGB32;
data->physicalSizeMM = QSizeF(GetDeviceCaps(hdc, HORZSIZE), GetDeviceCaps(hdc, VERTSIZE));
const int refreshRate = GetDeviceCaps(hdc, VREFRESH);
if (refreshRate > 1) // 0,1 means hardware default.
data->refreshRateHz = refreshRate;
DeleteDC(hdc);
} else {
qWarning("%s: Unable to obtain handle for monitor '%s', defaulting to %g DPI.",
__FUNCTION__, qPrintable(QString::fromWCharArray(info.szDevice)),
data->dpi.first);
} // CreateDC() failed
} // not lock screen
