pressed atl

, locale_system_defaultdispid far * rgdispid // returns the queried interface function ID array); invoke function hresult invoke (dispid dispidmember, // interface function ID refiid riid, // reserved parameter, iid_nulllcid lcid, // language idword wflags, // type of the interface function dispparams far * pdispparams, // parameter variant far * pvarresult of the function, // The Return Value of the function is reset info far * pexcepinfo, // the error message unsigned int far * puargerr // err

Component Object Model and ATL implementation Addendum Cheungmine 2007-10-11 The component object model and the ATL implementation document have been written, but a key issue is missing. There is another place where you need to modify the atlcom. h file. I will change it here. Open atlcom0.h after correction in the previous article and find the following function: Stdmethodimp ienumonstlimpl Correct it to

Recently compiled a DLL using ATL, which always appears during compilation."Nafxcwd. Lib (dllmodul. OBJ): Error lnk2005: _ dllmain @ 12..." error!Later, we found that when we created the DLL, we did not use MFC. Later, we added something related to MFC in the project, which caused the above problem.Follow these steps to solve the problem:1. Change the project settings to "dynamic use of MFC"2. on the C ++ settings page, you can see that _ usrdll and _

Non-virtual function polymorphism used in ATL/wtl Template This is a method that uses the template mechanism to implement polymorphism in C ++. It avoids the overhead of virtual function vtable and is the most basic principle for understanding ATL/wtl.

// Method 1 Cstring STR = _ T ("teststr "); Uses_conversion; Lpwstr pwstr = new wchar_t [Str. getlength () + 1]; Wcscpy (pwstr, T2W (lpctstr) Str )); // Method 2Cstring STR = _ T ("teststr "); Uses_conversion; Lpwcstr pwcstr = a2cw (lpcstr) Str ); A2cw (lpcstr)-> (lpcwstr), user_conversion indicates that some intermediate variables are defined. This statement must be defined before the ATL conversion macro is used. It is easier to convert the lpcws

1. Pass in the base class and inherit the implementationWhen designing a COM interface, we often encounter the following situation: design a base interface, and other interfaces inherit this interface. A typical example is the iunknown interface. All com interfaces must be inherited from the iunknown interface, and the implementations of these interfaces are the same. We cannot write an iunknown interface implementation for each COM interface. The implementation of the iunknown interface is comp

I recently made an online banking project in Niit.bangalore. This project is written almost in VB, and only a small part of it involves the ATL component, which only teaches us to write distributed applications. I wrote a middle-tier component that used ATL and ADO to query back-end (SQL Server) and some of the code was shown here. I assume that the reader understands (at least) ATL's COM programming and V

Introduced So far, we haven't discussed anything about assembly language. But if we really want to get to the bottom of the ATL, we can't avoid this, because ATL uses some low-level technology and some inline assembly language to make it smaller and faster. Here, I assume that the reader already has the basics of assembly language, so I'll just focus on my topic and not write another assembly language tuto

Recently made an ATL-based control, designed an interface, want to return multiple parameters, but through JavaScript but can not get the return value, originally thought is the problem of their own interface, and later found on the Internet a lot to find that the original MSDN has a clear saying:JavaScript does not support passing parameters by reference. JavaScript would make copies of these variables and pass them by value when calling methods then

current author in the earliest Windows CE system Building tools software is completely written using WIN32 [at that time the size of the software requirements are very high], but through this to the entire window program operation mechanism is still very clear.The development tool was also popular at that time VC1.52 Borland c++[Levi in Borland's book has detailed introduction].Reference booksWin32 API Reference ManualWindows Programming (Charles Petzold)These can be said to be very classical i

Sometimes, we need to write the program without the user login, as long as the Windows system started running, then we can write our program as a Windows service. Services can be used by a variety of users, including local and remote users, with the ability to administer at a user's authorization level, and whether the user is physically connected to the computer running the application. Next, I'll use a simple example to illustrate how to write a Windows service program in

First, the introduction Recently, due to the requirements of the work, I need to do some development work on IE. So I went through some of the information on MSDN, and on the MSDN note I accomplished the "capitalist Boss" assignment with ATL. (and in the daytime sleep in the process of the dream of the boss gave me a pay increase ...) ） Now, I have translated the original information on MSDN and Fengxian the implementation of an

supports receiving drag-and-drop files.2. Listen for message wm_dropfiles on the window and implement the message listener function.LRESULT ondropfiles (UINT umsg, WPARAM WPARAM, LPARAM LPARAM, bool bhandled);https://msdn.microsoft.com/en-us/library/windows/desktop/bb774303 (v=vs.85). aspxThen implement the desired logic in the message handler function.TCHAR Szfilepathname[_max_path+1] = {0}; Hdrop Hdrop = (hdrop) WParam; UINT Nfilecount =::D ragqueryfile (Hdrop, 0xFFFFFFFF, NULL, 0);std::vecto

Atl_no_vtable does not allow the compiler to generate a vtable and does not set the vpointer value.Normally, when calling constructor and destructor, the compiler inserts the correspondingCode. This code can be omitted if atl_no_vtable is used. This is used in ATL because this class is an abstract class and vtable is not required. The real class is ccomobject -------------------------------------------------------------- # Define atl_no_vtable _ d

Scene:1. Zoom the picture, needless to say, is the need for thumbnails and painting on the interface of this kind.2. Cut, needless to say, is to cut a portion of the picture used to draw the control background.3. The wximage of Wxwidget is a direct method of bringing these functions.gdiplus::bitmap* cutimage (gdiplus::image* source,int x,int y,int width,int height) { Gdiplus::rect zoomrect (0, 0, width,height); gdiplus::bitmap* Pimagescale_ = new Gdiplus::bitmap (zoomrect.width, zoomrect.height)

Scene:1. CStatic supports an indefinite length of string, can also support the picture background, and of course the parent control responds to the wm_ctlcolorstatic message.2. CStatic that can respond to a click event can be used as a simple button without the need for custom drawing operations.3. Normal created cstatic can not respond to click Time, need to add ss_notify style, note that Aa_static_click is a custom event ID.#ifndef __dh_static#define __dh_static#include "Window/common/dh_win_m

= s_ OK){Ppict-> get_width ( cxsrc );Ppict-> get_height ( cysrc );Ppict-> render (Di. hdcdraw, RC. Left, RC. Top, RC. Right, RC. Bottom, 0, cxsrc, cysrc, rc );}}} //Hresult ondraw (atl_drawinfo di){Rect rc = * (rect *) Di. prcbounds;Rectangle (Di. hdcdraw, RC. Left, RC. Top, RC. Right, RC. Bottom ); Settextalign (Di. hdcdraw, ta_center | ta_baseline );Lpctstr psztext = _ T ("ATL 3.0: OBJ ");Textout (Di. hdcdraw,(RC. Left + RC. Right)/2,(RC. Top +

Understanding the atlnotable and template implementations in ATL without virtual function table Polymorphism Wentao sun Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> # Include Iostream > Using Namespace STD; Template Typename t > Class B1{ Public : Void Sayhi (){T * PT = Static_cast T *> ( This );PT -> Printclassname ();} VoidPrintclassname (){Cout"Th

Add ATL/wtl support for DLL

Compile ActiveX control that does not bring up warnings in the browser When we compile ActiveX controls, if we use them in a browser, a prompt indicating that the running scripts are not secure is often displayed. If we use them, this will cause great inconvenience. According to the description of msdn, there are usually two methods: Implementing the iobjectsafe interface and modifying the registry. Generally, if you use ATL to develop ActiveX control