/// <summary>
/// PreMessageLoop is responsible for registering the COM class
/// factories for the COM classes to be exposed from the server, and
/// initializing the key member variables of the COM server (e.g.
/// _nMainThreadID and _nLockCnt).
/// </summary>
private void PreMessageLoop()
{
//
// Register the COM class factories.
//
Guid clsidSimpleObj = new Guid(SimpleObject.ClassId);
// Register the SimpleObject class object
int hResult = COMNative.CoRegisterClassObject(
ref clsidSimpleObj, // CLSID to be registered
new SimpleObjectClassFactory(), // Class factory
CLSCTX.LOCAL_SERVER, // Context to run
REGCLS.MULTIPLEUSE | REGCLS.SUSPENDED,
out _cookieSimpleObj);
if (hResult != 0)
{
throw new ApplicationException(
"CoRegisterClassObject failed w/err 0x" + hResult.ToString("X"));
}
// Register other class objects
// ...
// Inform the SCM about all the registered classes, and begins
// letting activation requests into the server process.
hResult = COMNative.CoResumeClassObjects();
if (hResult != 0)
{
// Revoke the registration of SimpleObject on failure
if (_cookieSimpleObj != 0)
{
COMNative.CoRevokeClassObject(_cookieSimpleObj);
}
// Revoke the registration of other classes
// ...
throw new ApplicationException(
"CoResumeClassObjects failed w/err 0x" + hResult.ToString("X"));
}
//
// Initialize member variables.
//
// Records the ID of the thread that runs the COM server so that
// the server knows where to post the WM_QUIT message to exit the
// message loop.
_nMainThreadID = NativeMethod.GetCurrentThreadId();
// Records the count of the active COM objects in the server.
// When _nLockCnt drops to zero, the server can be shut down.
_nLockCnt = 0;
// Start the GC timer to trigger GC every 5 seconds.
_gcTimer = new Timer(new TimerCallback(GarbageCollect), null,
5000, 5000);
}
private void PreMessageLoop()
{
Guid clsidSimpleObj = new Guid(CacheConnector.ClassId);
int hResult = COMNative.CoRegisterClassObject(
ref clsidSimpleObj,
new CacheConnectorClassFactory(),
CLSCTX.LOCAL_SERVER,
REGCLS.MULTIPLEUSE | REGCLS.SUSPENDED,
out _cookieSimpleObj);
if (hResult != 0)
{
throw new ApplicationException(
"CoRegisterClassObject failed w/err 0x" + hResult.ToString("X"));
}
hResult = COMNative.CoResumeClassObjects();
if (hResult != 0)
{
if (_cookieSimpleObj != 0)
{
COMNative.CoRevokeClassObject(_cookieSimpleObj);
}
throw new ApplicationException(
"CoResumeClassObjects failed w/err 0x" + hResult.ToString("X"));
}
_nMainThreadID = NativeMethod.GetCurrentThreadId();
_nLockCnt = 0;
_gcTimer = new Timer(new TimerCallback(GarbageCollect), null,
5000, 5000);
}
/// <summary>
/// PreMessageLoop负责注册COM类工厂，并且初始化COM服务器的关键成员变量
/// （比如_nMainThreadID和_nLockCnt）
/// </summary>
private void PreMessageLoop()
{
/////////////////////////////////////////////////////////////////
// 注册COM类工厂
//
Guid clsidSimpleObj = new Guid(CSSimpleObject.ClassId);
// 注册CSSimpleObject类对象
int hResult = COMNative.CoRegisterClassObject(
ref clsidSimpleObj, // 即将被注册的CLSID
new CSSimpleObjectClassFactory(), // 类工厂
CLSCTX.LOCAL_SERVER, // 执行代码块
REGCLS.MULTIPLEUSE | REGCLS.SUSPENDED,
out _cookieSimpleObj);
if (hResult != 0)
{
throw new ApplicationException(
"CoRegisterClassObject failed w/err 0x" + hResult.ToString("X"));
}
// 注册其他类对象
// ...
// 通知SCM所有的已注册类以及在服务器进程中开始激活请求。
hResult = COMNative.CoResumeClassObjects();
if (hResult != 0)
{
// 在失败时撤销 CSSimpleObject的注册
if (_cookieSimpleObj != 0)
{
COMNative.CoRevokeClassObject(_cookieSimpleObj);
}
// 撤销其他类的注册
// ...
throw new ApplicationException(
"CoResumeClassObjects failed w/err 0x" + hResult.ToString("X"));
}
/////////////////////////////////////////////////////////////////
// 初始化成员变量
// 记录COM服务器当前运行中的线程ID。这样，服务器可以知道哪里可以发送
// WM_QUIT消息，以便退出消息循环。
_nMainThreadID = NativeMethod.GetCurrentThreadId();
// 记录在服务器中激活的COM对象的数目。当_nLockCnt为0时，服务器可以关闭。
_nLockCnt = 0;
// 启动GC计时器以触发每5秒一次的GC。
_gcTimer = new Timer(new TimerCallback(GarbageCollect), null,
5000, 5000);
}
protected override void OnStart(string[] args)
{
Guid clsidSimpleObj = new Guid(SimpleObject.ClassId);
// Register the SimpleObject class object on start
int hResult = COMNative.CoRegisterClassObject(
ref clsidSimpleObj, // CLSID to be registered
new SimpleObjectClassFactory(), // Class factory
CLSCTX.LOCAL_SERVER, // Context to run
REGCLS.MULTIPLEUSE | REGCLS.SUSPENDED,
out _cookieSimpleObj);
if (hResult != 0)
{
throw new ApplicationException(
"CoRegisterClassObject failed w/err 0x" + hResult.ToString("X"));
}
// Register other class objects
// ...
// Inform the SCM about all the registered classes, and begins
// letting activation requests into the server process.
hResult = COMNative.CoResumeClassObjects();
if (hResult != 0)
{
// Revoke the registration of SimpleObject
if (_cookieSimpleObj != 0)
{
COMNative.CoRevokeClassObject(_cookieSimpleObj);
}
throw new ApplicationException(
"CoResumeClassObjects failed w/err 0x" + hResult.ToString("X"));
}
}