By J. P. Hamilton, Ron Petrusha
Whereas visible simple presents a great set of assets for swiftly constructing standalone functions, it lacks the assets that let you combine that program or its info documents with the home windows shell by way of including such positive factors as personalized context menu handlers, consistent with example icons (such as an information dossier icon that is in line with the contents of the file), or personalized estate sheets. commonly, those shell extensions that heavily combine an program with the home windows shell are written in C++, and all the to be had documentation specializes in utilizing C++ to create shell extensions. Even C++ programmers, in spite of the fact that, have trouble doing so, in view of the woefully insufficient country of the documentation. only a few programmers comprehend that writing shell extensions isn't tied to a unmarried language or improvement setting, and that visible simple is a superb instrument for developing shell extensions that extra heavily tie an software to the home windows shell. That, even if, is strictly the point of interest of visible simple Shell Programming: to teach you ways to exploit shell providers to boost the shell extensions that let you heavily combine your program with the home windows shell, and to supply the fundamental documentation you need to accomplish this. each one significant form of shell extension is roofed, together with: * Context menu handlers which may upload goods to the popup menu that looks whilst the person correct clicks a dossier. * Icon handlers for showing in keeping with example icons that, just like the ordinary Recycle Bin icon, fluctuate counting on a few situation * estate sheet pages, which look while the consumer selects the homes choice from a file's contextmenu. InfoTip handlers, which show tooltips, or "info" information for a dossier item on a according to example foundation. In exhibiting easy methods to combine your purposes with the home windows shell via development shell extensions, writer J.P. Hamilton additionally presents a concrete educational on COM programming with visible simple. whereas constructing your personal shell extensions, you will come upon a couple of complicated VB suggestions and methods: * guidelines. considering the fact that VB has a tendency to hides tips from the programmer, Hamilton indicates how you can make the most of the undocumented VarPtr, StrPtr, and ObjPtr services, in addition to the Win32 RtlMoveMemory functionality. * utilizing classification identifiers (CLSIDs) from visible simple. * VTable amendment, which lets you override the truth that visible easy prevents you from controlling the HRESULT (or prestige code) back by way of a decision to a COM strategy. visible simple Shell Programming ventures the place none have long gone sooner than via displaying you the way to improve shell extensions whereas supplying a complicated remedy of COM programming with visible uncomplicated.
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Then we will find the vtable entry for QueryContextMenu in our object (see Chapter 1). We will use the AddressOf operator, in conjunction with CopyMemory, and swap the two addresses. Our new function, QueryContextMenuVB, will be called instead of the class implementation. Of course, QueryContextMenuVB will be a function, and we can return any value we want. When the object is released, the two addresses will be swapped back for posterity's sake. Our troubles are solved. The addresses of the two functions need to be swapped as quickly as possible.
Rad file context menu handler is to compile the type library containing the interface definitions and constants that will be needed from VB. Constants and UDTs will also be put into the type library with their associated interfaces. But only the groups of constants that are needed will be put in the library. For instance, we need the menu constants MF_BYPOSITION, MF_STRING, and MF_SEPARATOR. Therefore, the library will contain all of the MF_ constants. We don't need any of the menu state constants (MFS_ ), so they will not be included with the library.
An index representing a valid insertion point for the menu item is also passed in. Adding the menu item is simply a matter of calling the InsertMenu API . You might want different menu items displayed based on whether one or multiple files have been selected. Since the number of files selected can be determined in IShellExtInit::Initialize, this becomes a trivial matter. You also have the ability to base the menu item on the file itself. In addition to the number of files selected, you would also already know the filenames in question.
Visual Basic Shell Programming by J. P. Hamilton, Ron Petrusha