MAIN.CPP (HELLO OLE Sample)
/*************************************************************************
-
- OLE Automation Hello 2.0 Application.
-
- main.cpp
-
- Written by Microsoft Product Support Services, Windows Developer Support
- (c) Copyright Microsoft Corp. 1994 All Rights Reserved
-
- ***********************************************************************/
#include <windows.h>
#include <windowsx.h>
#ifdef WIN16
#include <ole2.h>
#include <compobj.h>
#include <dispatch.h>
#include <variant.h>
#include <olenls.h>
#endif
#include <initguid.h>
#include "hello.h"
// Globals
CHello FAR* g_phello;
SCODE g_scodes[SCODE_COUNT] = // Array of SCODEs for easy lookup
{
HELLO_E_UNEXPECTED
};
/*
* WinMain
*
* Purpose:
* Main entry point of application.
*
*/
int APIENTRY WinMain (HINSTANCE hinst, HINSTANCE hinstPrev, LPSTR pCmdLine,
int nCmdShow)
{
MSG msg;
DWORD dwRegisterCF;
DWORD dwRegisterActiveObject;
// It is recommended that all OLE applications set
// their message queue size to 96. This improves the capacity
// and performance of OLE's LRPC mechanism.
int cMsg = 96; // Recommend msg queue size for OLE
while (cMsg && !SetMessageQueue(cMsg)) // take largest size we can get.
cMsg -= 8;
if (!cMsg)
return -1; // ERROR: we got no message queue
if (!hinstPrev)
if (!InitApplication(hinst)) // Register window class
return FALSE;
if (!InitInstance(hinst)) // Initialize OLE and create Hello application
object
return (FALSE);
// Determine if /Automation was specified in command line and register
class
// factory and active object. Show window if application was started stand
alone.
if (!ProcessCmdLine(pCmdLine, &dwRegisterCF, &dwRegisterActiveObject,
nCmdShow))
{
Uninitialize(dwRegisterCF, dwRegisterActiveObject);
return (FALSE);
}
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
Uninitialize(dwRegisterCF, dwRegisterActiveObject);
return (msg.wParam);
}
/*
* InitApplication
*
* Purpose:
* Registers window class
*
* Parameters:
* hinst hInstance of application
*
* Return Value:
* TRUE if initialization succeeded, FALSE otherwise.
*/
BOOL InitApplication (HINSTANCE hinst)
{
WNDCLASS wc;
wc.style = CS_DBLCLKS | CS_SAVEBITS | CS_BYTEALIGNWINDOW;
wc.lpfnWndProc = MainWndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = DLGWINDOWEXTRA;
wc.hInstance = hinst;
wc.hIcon = LoadIcon(hinst, MAKEINTRESOURCE(IDI_ICON));
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = HBRUSH(COLOR_WINDOW + 1);
wc.lpszMenuName = NULL;
wc.lpszClassName = TEXT("MainWndClass");
return RegisterClass(&wc);
}
/*
* InitInstance
*
* Purpose:
* Intializes OLE and creates Hello Application object
*
* Parameters:
* hinst hInstance of application
*
* Return Value:
* TRUE if initialization succeeded, FALSE otherwise.
*/
BOOL InitInstance (HINSTANCE hinst)
{
HRESULT hr;
TCHAR ach[STR_LEN];
// Intialize OLE
hr = OleInitialize(NULL);
if (FAILED(hr))
return FALSE;
// Create an instance of the Hello Application object. Object is
// created with refcount 0.
LoadString(hinst, IDS_HelloMessage, ach, sizeof(ach));
hr = CHello::Create(hinst, ach, &g_phello);
if (FAILED(hr))
return FALSE;
return TRUE;
}
/*
* ProcessCmdLine
*
* Purpose:
* Check if command line contains /Automation. If so, the class factory of
the
* application object is registered. If not, the application was started
stand-alone and
* so the window is shown. The application object is registered using
RegisterActiveObject.
*
* Parameters:
* pCmdLine Command line passed to application
* pdwRegisterCF Returns id returned after class factory registration. Can
be used to
* revoke class factory registration.
* pdwRegisterActiveObject Returns id returned after active object
registration. Can be used to
* revoke active object registration.
* nCmdShow Specifies how window is to be shown if application was
started stand alone.
*
* Return Value:
* TRUE if OLE initialization succeeded, FALSE otherwise.
*
*/
BOOL ProcessCmdLine(LPSTR pCmdLine, LPDWORD pdwRegisterCF, LPDWORD
pdwRegisterActiveObject, int nCmdShow)
{
LPCLASSFACTORY pcf = NULL;
HRESULT hr;
*pdwRegisterCF = 0;
*pdwRegisterActiveObject = 0;
// Expose class factory for application object if command line contains the
// Automation switch
if (_fstrstr(pCmdLine, "-Automation") != NULL
|| _fstrstr(pCmdLine, "/Automation") != NULL)
{
pcf = new CHelloCF;
if (!pcf)
goto error;
pcf->AddRef();
hr = CoRegisterClassObject(CLSID_Hello, pcf,
CLSCTX_LOCAL_SERVER, REGCLS_SINGLEUSE,
pdwRegisterCF);
if (hr != NOERROR)
goto error;
pcf->Release();
}
else g_phello->ShowWindow(nCmdShow); // Show window if started
stand-alone
// Register Hello application object in the Running Object Table (ROT).
This
// allows controllers to connect to a running application object instead of
creating
// a new instance. Use weak registration so that the ROT releases it's
reference when
// all external references are released. If strong registration is used,
the ROT will not
// release it's reference until RevokeActiveObject is called and so will
keep
// the object alive even after all external references have been released.
RegisterActiveObject(g_phello, CLSID_Hello, ACTIVEOBJECT_WEAK,
pdwRegisterActiveObject);
return TRUE;
error:
if (pcf)
pcf->Release();
return FALSE;
}
/*
* Uninitialize
*
* Purpose:
* Revoke class factory and active object registration and uninitialize OLE.
*
* Parameters:
* dwRegisterCF ID returned after class factory registration.
* dwRegisterActiveObject ID returned after active object registration.
*
*/
- oid Uninitialize(DWORD dwRegisterCF, DWORD dwRegisterActiveObject)
{
if (dwRegisterCF != 0)
CoRevokeClassObject(dwRegisterCF);
if (dwRegisterActiveObject != 0)
RevokeActiveObject(dwRegisterActiveObject, NULL);
OleUninitialize();
}
/*
* MainWndProc
*
* Purpose:
* Window procedure for main window. The main window is a dialog.
*
*/
LRESULT CALLBACK MainWndProc (HWND hwnd, UINT msg, WPARAM wParam, LPARAM
lParam)
{
switch (msg)
{
case WM_COMMAND:
{
switch(GET_WM_COMMAND_ID(wParam, lParam))
{
case IDC_SAYHELLO:
g_phello->SayHello();
break;
case IDC_HELLODISPLAY:
switch(GET_WM_COMMAND_CMD(wParam, lParam))
{
TCHAR ach[100];
case EN_CHANGE:
// Update HelloMsg property of Hello object
corresponding to this
// window when the contents of the edit control change.
GetDlgItemText(hwnd, IDC_HELLODISPLAY, ach, 100);
g_phello->put_HelloMessage(TO_OLE_STRING(ach));
}
return 0L;
default:
return 0L;
break;
}
}
break;
case WM_CLOSE:
// Hide the window to release the refcount added by
CoLockObjectExternal
// (See CHello::ShowWindow)
g_phello->ShowWindow(SW_HIDE);
return DefDlgProc(hwnd, msg, wParam, lParam);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefDlgProc(hwnd, msg, wParam, lParam);
}
return NULL;
}
/*
* LoadTypeInfo
*
* Purpose:
* Gets type information of an object's interface from type library.
*
* Parameters:
* ppunkStdDispatch Returns type information.
* clsid Interface id of object in type library.
*
* Return Value:
* HRESULT
*
*/
HRESULT LoadTypeInfo(ITypeInfo FAR* FAR* pptinfo, REFCLSID clsid)
{
HRESULT hr;
LPTYPELIB ptlib = NULL;
LPTYPEINFO ptinfo = NULL;
*pptinfo = NULL;
// Load Type Library.
hr = LoadRegTypeLib(LIBID_Hello, 2, 0, 0x0409, &ptlib);
if (FAILED(hr))
{
// if it wasn't registered, try to load it from the path
// if this succeeds, it will have registered the type library for us
// for the next time.
hr = LoadTypeLib(OLESTR("hello.tlb"), &ptlib);
if(FAILED(hr))
return hr;
}
// Get type information for interface of the object.
hr = ptlib->GetTypeInfoOfGuid(clsid, &ptinfo);
if (FAILED(hr))
{
ptlib->Release();
return hr;
}
ptlib->Release();
*pptinfo = ptinfo;
return NOERROR;
}
#ifdef WIN32
#ifndef UNICODE
char* ConvertToAnsi(OLECHAR FAR* szW)
{
static char achA[STRCONVERT_MAXLEN];
WideCharToMultiByte(CP_ACP, 0, szW, -1, achA, STRCONVERT_MAXLEN, NULL,
NULL);
return achA;
}
OLECHAR* ConvertToUnicode(char FAR* szA)
{
static OLECHAR achW[STRCONVERT_MAXLEN];
MultiByteToWideChar(CP_ACP, 0, szA, -1, achW, STRCONVERT_MAXLEN);
return achW;
}
#endif
#endif
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