来自HDC的C ++ EnumDisplayMonitors

Question

为什么DisplayMonitors从HDC出现故障？

HDC monitorDC = (CreateDC(displayDevices[0].DeviceName, displayDevices[0].DeviceName, NULL, NULL));
// Generates valid HDC from EnumDisplayDevices
EnumDisplayMonitors(NULL, NULL, MonitorEnumProc, 0)
// Returns true
EnumDisplayMonitors(monitorDC, NULL, MonitorEnumProc, 0)
// Returns false

EnumDisplayMonitors MSDN