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Three, purely manually create a COM component 1, from the construction project to the implementation of registration In this process we will complete three steps: Create DLL entry function, define interface file, implement registration function 1.1 Create a type Win32 DLL project Create a Win32 DLL project called Mathcom. In the second step of the wizard, select the "A smiple DLL project" option. Of course, if you choose an empty project, then you complete the DllMain definition yourself.

catalog=mydb;data source=li5ch\\sqlexpress"; the -HRESULT hr = M_pconnection->open (strsrc,l"", L"",-1); - } - Catch(_com_error e) + { - CString errormsg; +ErrorMsg. Format (L"Close Connection--operation Error! \ r \ n Error message:%s", E.errormessage ()); A AfxMessageBox (errormsg); at - } - - } - returnTRUE; - in}2. How ADO executes SQL statementsBOOL cdateoperator::excutesql (CString strsql

DoDragDrop.Ole32!DoDragDropThe main logic is as follows:#!c++ HRESULT __stdcallDoDragDrop(LPDATAOBJECT pDataObj, LPDROPSOURCE pDropSource, DWORD dwOKEffects, LPDWORD pdwEffect) { CDragOperationdrgop; HRESULT hr; CDragOperation::CDragOperation(drgop, pDataObj, pDropSource, dwOKEffects, pdwEffect, hr); if ( hr>= 0 ){ while ( CDragOperation::UpdateTarget(drgop) CDragOperation::DragO

with HRESULT:0X80073CFA, removal failed. Please contact your software vendor.(Exception from HRESULT:0X80073CFA)Error 0x80070032:appx Deployment Remove operation on packageMicrosoft.xboxgamecallableui_1000.10240.16384.0_neutral_neutral_cw5n1h2txyewy from:C:\Windows\SystemApps\Microsoft.XboxGameCallableUI_cw5n1h2txyewy failed. This app was part of the Windows and cannot beUninstalled on a per-user basis. An

window. Save the project file as contextmenu. DPR, unit1 as contextmenuhandle. Pas, and formOpwindow. Pas.The contextmenu. DPR program list is as follows:Library contextmenu;UsesComserv,Contextmenuhandle in 'contextmenuhandle. pa ',Opwindow in 'opwindow. pa' {form2 }; ExportsDllgetclassobject,Dllcanunloadnow,Dllregisterserver,Dllunregisterserver; {$ R *. TLB} {$ R *. Res} Begin End. The contextmenuhandle program list is as follows:Unit contextmenuhandle; InterfaceUses Windows, ActiveX, comobj,

parameter 1 callback ...... Too many ...... Too many ...... Struct (a). Common Function (B). member function (c). Return Value of the member function with the userdata parameter ~~~~~~~~~~~~~~~~ For the process (VB syntax): Sub proc (byval N as long) VB is actually processed as (IDL syntax): hresult proc ([in] int N ); after the this pointer is added, it is actually changed to (C syntax): hresult proc (voi

call the COM object will occur. // open the Word document worddoc = wordapp. documents. open (wordpath); // Insert the text range wordrange = worddoc to the word. range (0, 0); wordrange. TEXT = "this is the inserted text"; // Save the worddoc. save ();} catch (exception ex) {// obtain the hresult value corresponding to the exception // The Int hresult = successful Al returned by the method in COM. gethrfo

, add the voice class. Note that the header file of the custom voice class contains "sphelper. H" and the custom voice recognition message and type. # Define gid_1__gr 333333 # Define wm_recoevent wm_user+ 102 The rest is to supplement the function body to the functions initsr () and recoevent () of the CPP file. 3) For details, see the following: Code : (1) void cspeech: initsr () { Hresult hR = s_ OK; HR = m_cprecoeng

Variable type is Boolean; True =-1, False = 0. VT_VARIANT Variable type isVARIANTFAR *. VT_UNKNOWN Variable type isIUnknownFAR *. VT_UI1 Variable type is unsigned char. VT_RESERVED This element is reserved. VT_BYREF Variable type is a pointer to data. VT_ARRAY Variable type is a safe array. 4. Write Data SafeArrayPutElement(pSArray, l, inqReport[l]); Instance Program (COM method ): AA: Shiel

nTouchOptions, BOOL bEnable){ATLASSERT(::IsWindow(m_hWnd));::SendMessage(m_hWnd, EM_SETTOUCHOPTIONS, nTouchOptions, bEnable);}HRESULT InsertTable(TABLEROWPARMS* pRowParams, TABLECELLPARMS* pCellParams){ATLASSERT(::IsWindow(m_hWnd));return (HRESULT)::SendMessage(m_hWnd, EM_INSERTTABLE, (WPARAM)pRowParams, (LPARAM)pCellParams);}HRESULT GetTableParams(TABLEROWPARMS

DeclarationDeclare_interface _ (itimelog, iunknown){Stdmethod (outputlog) (BSTR * varlogtext) pure;}; Note: 1.macro define_guidcan be associated with progidof the group and interface. It can be generated using the guidgen.exe tool. 2. Macro declare_interface _ declares the interface. The first parameter of the macro is the interface name, and the second parameter is the base class of the interface. The declare_interface macro is used to declare interfaces without the base class. 3. the ma

to record pin pointers. Int m_ipins; number of pins. Method: Hresult addpin (csourcestream *); add a pin. Hresult removepin (csourcestream *); remove the pin. Stdmethodimp findpin (lpcwstr ID, ipin ** pppin); find the pin. Int getpincount (void); returns the number of pins. It can be seen that the csource class is the management of the pin. More functions are implemented by cbasefilter. To implement your o

CComPtr #ifndef _EXTERNALUIHANDLER_H_#define _EXTERNALUIHANDLER_H_#pragma onceclass CExternalDisp:public CComObjectRoot,public IDispatch{public:CExternalDisp(void);~CExternalDisp(void);BEGIN_COM_MAP(CExternalDisp)COM_INTERFACE_ENTRY(IDispatch)END_COM_MAP()virtual HRESULT STDMETHODCALLTYPE GetTypeInfoCount( /* [out] */ UINT *pctinfo);virtual HRESULT STDMETHODCALLTYPE GetTypeInfo( /* [in] */ UINT iTInfo,/*

. 3. Ccolorfilter is the key, and this is a minimal realization. HRESULT CheckInputType(const CMediaType *pmtin);　　HRESULT GetMediaType(int iPosition, CMediaType *pMediaType);　　HRESULT CheckTransform(const CMediaType *mtin,const CMediaType *mtout);　　HRESULT DecideBufferSize(IMemAllocator *pAlloc,ALLOCATOR_PROPERTIES

The simplest language to call COM components is, of course, C + +, but in some cases it has to be in C language. This article describes the methods for calling COM components in C language.To better understand C's approach, let's take a look at how C + + calls COM components.First, C + + modeStarting with Windows 7, the taskbar can display a progress bar, which is an example of this interface.ITaskbarList4 *ptaskbar = nullptr; HRESULT

project type is MFC Appwizard (exe) Add the following in stdafx. h: # Import "addcom. TLB" using namespace addcom;Program code: Void cusecomdlg: onbuttonuse () {// todo: add your control notification handler code here int dresult; float fresult; cstring strresult; coinitialize (null ); // if the value of null is 0, addcom: addcominterfaceptr p_add (_ uuidof (addcomservice); dresult = p_add-> iadd (1.2); fresult = p_add-> FADD, 2.3); strresult. format ("int: % d/nfloat: % F", dresult, fresult);

Grid 2 ID3DXBuffer The ID3DXBuffer interface is a generic data structure. This interface has two methods. · LPVOID GetBufferPointer (); returns the pointer pointing to the starting position of data in the cache. · DWORD GetBufferSize (); return the cache size, in bytes. To ensure the versatility of this interface, this interface uses the void type pointer, which means that we must implement the data type to be stored. For example, the D3DXLoadMeshFromX function returns the adjacent information

function to register the drag-and-drop form: Write a callback function to notify the main form file to be dragged. The circle of the callback function is as follows, where CFrameWnd is your form class: typedef void (*DROPCALLBACK)(CFrameWnd*, HDROP);The method for writing callback functions is similar to that for processing WM_DROPFILES messages. You need to declare the callback function as a friend of the Form class. This adds the drag function. The code for the CDropFileEx class is

use this function. The program must register a filter graph instance in the running object table (ROT. Rot is a globally searchable table to keep running tracking. The object is registered with an alias in the rot. To link graph, graphedit finds the aliases in the rot that match the specific format: ! FiltergraphXPIDY X is the address of the hex fiter graph manager, and Y is the process ID and hexadecimal. When your program creates fiter graph for the first time, it calls the following functio

encapsulates a connection management class and test code, which clearly shows what operations Windows Mobile needs to do before socket programming. First, you need to enumerate the currently available connections. Void cconnectmanager: enumnetidentifier (Out cstringarray strary){Connmgr_destination_info networkdestinfo = {0 };// Obtain the Network ListFor (DWORD dwenumindex = 0; dwenumindex ++){Memset ( networkdestinfo, 0, sizeof (connmgr_destination_info ));If (connmgrenumdestinations (dwenum