CAtlExeModuleT Class
This class represents the module for an application.
Syntax
template <class T>
class ATL_NO_VTABLE CAtlExeModuleT : public CAtlModuleT<T>
Parameters
T
Your class derived from CAtlExeModuleT.
Members
Public Constructors
| Name | Description |
|---|---|
| CAtlExeModuleT::CAtlExeModuleT | The constructor. |
| CAtlExeModuleT::~CAtlExeModuleT | The destructor. |
Public Methods
| Name | Description |
|---|---|
| CAtlExeModuleT::InitializeCom | Initializes COM. |
| CAtlExeModuleT::ParseCommandLine | Parses the command line and performs registration if necessary. |
| CAtlExeModuleT::PostMessageLoop | This method is called immediately after the message loop exits. |
| CAtlExeModuleT::PreMessageLoop | This method is called immediately before entering the message loop. |
| CAtlExeModuleT::RegisterClassObjects | Registers the class object. |
| CAtlExeModuleT::RevokeClassObjects | Revokes the class object. |
| CAtlExeModuleT::Run | This method executes code in the EXE module to initialize, run the message loop, and clean up. |
| CAtlExeModuleT::RunMessageLoop | This method executes the message loop. |
| CAtlExeModuleT::UninitializeCom | Uninitializes COM. |
| CAtlExeModuleT::Unlock | Decrements the module's lock count. |
| CAtlExeModuleT::WinMain | This method implements the code required to run an EXE. |
Public Data Members
| Name | Description |
|---|---|
| CAtlExeModuleT::m_bDelayShutdown | A flag indicating that there should be a delay shutting down the module. |
| CAtlExeModuleT::m_dwPause | A pause value used to ensure all objects are released before shutdown. |
| CAtlExeModuleT::m_dwTimeOut | A time-out value used to delay the unloading of the module. |
Remarks
CAtlExeModuleT represents the module for an application (EXE) and contains code that supports creating an EXE, processing the command line, registering class objects, running the message loop, and cleaning up on exit.
This class is designed to improve performance when COM objects in the EXE server are continually created and destroyed. After the last COM object is released, the EXE waits for a duration specified by the CAtlExeModuleT::m_dwTimeOut data member. If there is no activity during this period (that is, no COM objects are created), the shutdown process is initiated.
The CAtlExeModuleT::m_bDelayShutdown data member is a flag used to determine if the EXE should use the mechanism defined above. If it is set to false, then the module will terminate immediately.
For more information on modules in ATL, see ATL Module Classes.
Inheritance Hierarchy
CAtlExeModuleT
Requirements
Header: atlbase.h
CAtlExeModuleT::CAtlExeModuleT
The constructor.
CAtlExeModuleT() throw();
Remarks
If the EXE module could not be initialized, WinMain will immediately return without further processing.
CAtlExeModuleT::~CAtlExeModuleT
The destructor.
~CAtlExeModuleT() throw();
Remarks
Frees all allocated resources.
CAtlExeModuleT::InitializeCom
Initializes COM.
static HRESULT InitializeCom() throw();
Return Value
Returns S_OK on success, or an error HRESULT on failure.
Remarks
This method is called from the constructor and can be overridden to initialize COM in a manner different from the default implementation. The default implementation either calls CoInitializeEx(NULL, COINIT_MULTITHREADED) or CoInitialize(NULL) depending on the project configuration.
Overriding this method normally requires overriding CAtlExeModuleT::UninitializeCom.
CAtlExeModuleT::m_bDelayShutdown
A flag indicating that there should be a delay shutting down the module.
bool m_bDelayShutdown;
Remarks
See the CAtlExeModuleT Overview for details.
CAtlExeModuleT::m_dwPause
A pause value used to ensure all objects are gone before shutdown.
DWORD m_dwPause;
Remarks
Change this value after calling CAtlExeModuleT::InitializeCom to set the number of milliseconds used as the pause value for shutting down the server. The default value is 1000 milliseconds.
CAtlExeModuleT::m_dwTimeOut
A time-out value used to delay the unloading of the module.
DWORD m_dwTimeOut;
Remarks
Change this value after calling CAtlExeModuleT::InitializeCom to define the number of milliseconds used as the time-out value for shutting down the server. The default value is 5000 milliseconds. See the CAtlExeModuleT Overview for more details.
CAtlExeModuleT::ParseCommandLine
Parses the command line and performs registration if necessary.
bool ParseCommandLine(LPCTSTR lpCmdLine, HRESULT* pnRetCode) throw();
Parameters
lpCmdLine
The command line passed to the application.
pnRetCode
The HRESULT corresponding to the registration (if it took place).
Return Value
Return true if the application should continue to run, otherwise false.
Remarks
This method is called from CAtlExeModuleT::WinMain and can be overridden to handle command-line switches. The default implementation checks for /RegServer and /UnRegServer command-line arguments and performs registration or unregistration.
CAtlExeModuleT::PostMessageLoop
This method is called immediately after the message loop exits.
HRESULT PostMessageLoop() throw();
Return Value
Returns S_OK on success, or an error HRESULT on failure.
Remarks
Override this method to perform custom application cleanup. The default implementation calls CAtlExeModuleT::RevokeClassObjects.
CAtlExeModuleT::PreMessageLoop
This method is called immediately before entering the message loop.
HRESULT PreMessageLoop(int nShowCmd) throw();
Parameters
nShowCmd
The value passed as the nShowCmd parameter in WinMain.
Return Value
Returns S_OK on success, or an error HRESULT on failure.
Remarks
Override this method to add custom initialization code for the application. The default implementation registers the class objects.
CAtlExeModuleT::RegisterClassObjects
Registers the class object with OLE so other applications can connect to it.
HRESULT RegisterClassObjects(DWORD dwClsContext, DWORD dwFlags) throw();
Parameters
dwClsContext
Specifies the context in which the class object is to be run. Possible values are CLSCTX_INPROC_SERVER, CLSCTX_INPROC_HANDLER, or CLSCTX_LOCAL_SERVER.
dwFlags
Determines the connection types to the class object. Possible values are REGCLS_SINGLEUSE, REGCLS_MULTIPLEUSE, or REGCLS_MULTI_SEPARATE.
Return Value
Returns S_OK on success, S_FALSE if there were no classes to register, or an error HRESULT on failure.
CAtlExeModuleT::RevokeClassObjects
Removes the class object.
HRESULT RevokeClassObjects() throw();
Return Value
Returns S_OK on success, S_FALSE if there were no classes to register, or an error HRESULT on failure.
CAtlExeModuleT::Run
This method executes code in the EXE module to initialize, run the message loop, and clean up.
HRESULT Run(int nShowCmd = SW_HIDE) throw();
Parameters
nShowCmd
Specifies how the window is to be shown. This parameter can be one of the values discussed in the WinMain section. Defaults to SW_HIDE.
Return Value
Returns S_OK on success, or an error HRESULT on failure.
Remarks
This method can be overridden. However, in practice is it better to override CAtlExeModuleT::PreMessageLoop, CAtlExeModuleT::RunMessageLoop, or CAtlExeModuleT::PostMessageLoop instead.
CAtlExeModuleT::RunMessageLoop
This method executes the message loop.
void RunMessageLoop() throw();
Remarks
This method can be overridden to change the behavior of the message loop.
CAtlExeModuleT::UninitializeCom
Uninitializes COM.
static void UninitializeCom() throw();
Remarks
By default this method simply calls CoUninitialize and is called from the destructor. Override this method if you override CAtlExeModuleT::InitializeCom.
CAtlExeModuleT::Unlock
Decrements the module's lock count.
LONG Unlock() throw();
Return Value
Returns a value which may be useful for diagnostics or testing.
CAtlExeModuleT::WinMain
This method implements the code required to run an EXE.
int WinMain(int nShowCmd) throw();
Parameters
nShowCmd
Specifies how the window is to be shown. This parameter can be one of the values discussed in the WinMain section.
Return Value
Returns the executable's return value.
Remarks
This method can be overridden. If overriding CAtlExeModuleT::PreMessageLoop, CAtlExeModuleT::PostMessageLoop, or CAtlExeModuleT::RunMessageLoop doesn't provide enough flexibility, it's possible to override the WinMain function using this method.
See also
ATLDuck Sample
CAtlModuleT Class
CAtlDllModuleT Class
Class Overview