问题
I found this page and was unable to get any useful information out of it (it searches the registry for something but never finds it and goes into an infinite loop).
As this question regarding getting the monitor serial UID ("EDID information") asks I would like the same information but from the point of view of Win32 C code (or C/C++ DDK code, or whatever) instead of Linux.
回答1:
WMI didn't support monitor classes in Windows XP. The documented way of getting the EDID was - and still is - with the Setup API.
Longer survey and a VC++ code sample are available here.
回答2:
First I got a C# version working using WMI Code Creator:
try
{
ManagementObjectSearcher searcher =
new ManagementObjectSearcher("root\\WMI",
"SELECT * FROM WmiMonitorID");
foreach (ManagementObject queryObj in searcher.Get())
{
Console.WriteLine("-----------------------------------");
Console.WriteLine("WmiMonitorID instance");
Console.WriteLine("-----------------------------------");
//Console.WriteLine("Active: {0}", queryObj["Active"]);
Console.WriteLine("InstanceName: {0}", queryObj["InstanceName"]);
dynamic snid = queryObj["SerialNumberID"];
Console.WriteLine("SerialNumberID: (length) {0}", snid.Length);
Console.WriteLine("YearOfManufacture: {0}", queryObj["YearOfManufacture"]);
dynamic code = queryObj["ProductCodeID"];
string pcid = "";
for (int i = 0; i < code.Length; i++)
{
pcid = pcid + Char.ConvertFromUtf32(code[i]);
//pcid = pcid +code[i].ToString("X4");
}
Console.WriteLine("ProductCodeID: " + pcid);
}
}
catch (ManagementException e)
{
Console.WriteLine("An error occurred while querying for WMI data: " + e.Message);
}
Below is the C++ code I found and tweaked to work with the InstanceName field in WmiMonitorID class (EDID structure) that I wanted to read. Don't forget to add setupapi.lib to your Linker > Additional Libraries build setting.
#define _WIN32_DCOM
#include <iostream>
using namespace std;
#include <wbemidl.h>
# pragma comment(lib, "wbemuuid.lib")
int EnumMonitorIDs()
{
ret.clear();
HRESULT hres = CoInitializeEx(0, COINIT_MULTITHREADED);
if (FAILED(hres))
{
cout << "Failed to initialize COM library. Error code = 0x"
<< hex << hres << endl;
return 1; // Program has failed.
}
hres = CoInitializeSecurity(
NULL,
-1, // COM authentication
NULL, // Authentication services
NULL, // Reserved
RPC_C_AUTHN_LEVEL_DEFAULT, // Default authentication
RPC_C_IMP_LEVEL_IMPERSONATE, // Default Impersonation
NULL, // Authentication info
EOAC_NONE, // Additional capabilities
NULL // Reserved
);
if (FAILED(hres))
{
cout << "Failed to initialize security. Error code = 0x"
<< hex << hres << endl;
CoUninitialize();
return 1;
}
IWbemLocator *pLoc = NULL;
hres = CoCreateInstance(
CLSID_WbemLocator,
0,
CLSCTX_INPROC_SERVER,
IID_IWbemLocator, (LPVOID *) &pLoc);
if (FAILED(hres))
{
cout << "Failed to create IWbemLocator object."
<< " Err code = 0x"
<< hex << hres << endl;
CoUninitialize();
return 1; // Program has failed.
}
IWbemServices *pSvc = NULL;
BSTR AbackB = SysAllocString(L"root\\WMI");
// Connect to the root\cimv2 namespace with
// the current user and obtain pointer pSvc
// to make IWbemServices calls.
hres = pLoc->ConnectServer(
AbackB, // Object path of WMI namespace
NULL, // User name. NULL = current user
NULL, // User password. NULL = current
0, // Locale. NULL indicates current
NULL, // Security flags.
0, // Authority (e.g. Kerberos)
0, // Context object
&pSvc // pointer to IWbemServices proxy
);
SysFreeString(AbackB);
if (FAILED(hres))
{
cout << "Could not connect. Error code = 0x"
<< hex << hres << endl;
pLoc->Release();
CoUninitialize();
return 1; // Program has failed.
}
hres = CoSetProxyBlanket(
pSvc, // Indicates the proxy to set
RPC_C_AUTHN_WINNT, // RPC_C_AUTHN_xxx
RPC_C_AUTHZ_NONE, // RPC_C_AUTHZ_xxx
NULL, // Server principal name
RPC_C_AUTHN_LEVEL_CALL, // RPC_C_AUTHN_LEVEL_xxx
RPC_C_IMP_LEVEL_IMPERSONATE, // RPC_C_IMP_LEVEL_xxx
NULL, // client identity
EOAC_NONE // proxy capabilities
);
if (FAILED(hres))
{
cout << "Could not set proxy blanket. Error code = 0x"
<< hex << hres << endl;
pSvc->Release();
pLoc->Release();
CoUninitialize();
return 1; // Program has failed.
}
BSTR wql = SysAllocString(L"WQL");
BSTR select = SysAllocString(L"SELECT * FROM WmiMonitorID");
IEnumWbemClassObject* pEnumerator = NULL;
hres = pSvc->ExecQuery(
wql,
select,
WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY,
NULL,
&pEnumerator);
SysFreeString(wql);
SysFreeString(select);
if (FAILED(hres))
{
cout << "Query for operating system name failed."
<< " Error code = 0x"
<< hex << hres << endl;
pSvc->Release();
pLoc->Release();
CoUninitialize();
return 1; // Program has failed.
}
IWbemClassObject *pclsObj = 0;
ULONG uReturn = 0;
while (pEnumerator)
{
HRESULT hr = pEnumerator->Next(WBEM_INFINITE, 1,
&pclsObj, &uReturn);
if (0 == uReturn)
{
break;
}
// ok, we have the EDID record, pull some fields out of it
VARIANT vtProp;
hr = pclsObj->Get(L"InstanceName", 0, &vtProp, 0, 0);
wcout << "----------------" << endl << "InstanceName : " << vtProp.bstrVal << endl;
VariantClear(&vtProp);
pclsObj->Release();
}
pSvc->Release();
pLoc->Release();
pEnumerator->Release();
CoUninitialize();
return 0;
}
回答3:
Based on Ofek Shilon's blog post, and tweaked to get all the device IDs (manufacturer ID + product ID strings):
DISPLAY_DEVICE dd;
dd.cb = sizeof(dd);
DWORD dev = 0; // device index
int id = 1; // monitor number, as used by Display Properties > Settings
Str DeviceID;
while (EnumDisplayDevices(0, dev, &dd, 0))
{
DISPLAY_DEVICE ddMon;
ZeroMemory(&ddMon, sizeof(ddMon));
ddMon.cb = sizeof(ddMon);
DWORD devMon = 0;
while (EnumDisplayDevices(dd.DeviceName, devMon, &ddMon, 0))
{
DeviceID.Sprintf("%s", ddMon.DeviceID);
DeviceID = DeviceID.Slice(8);
if (DeviceID.Index("\\") > 0)
DeviceID = DeviceID.Slice(0, DeviceID.Index("\\"));
printf ("DEVICEID = %s --------\n", DeviceID.utf8());
}
devMon++;
ZeroMemory(&ddMon, sizeof(ddMon));
ddMon.cb = sizeof(ddMon);
}
ZeroMemory(&dd, sizeof(dd));
dd.cb = sizeof(dd);
dev++;
}
N.B. Str here is a custom string class but should be easy to refactor to use anything.
来源：https://stackoverflow.com/questions/6363699/win32-code-to-get-edid-in-windows-xp-7