File Viewer SUMMARY ======= The FILEVIEW sample demonstrates the basic steps to implement a simple text-based file viewer. This particular sample is a viewer for text files, those with the .TXT extension, as well as any compound file with the CLSID of CLSID_SampleTextFile, defined as 0x00021116-0000-C000-000000000046. The files FLATTEXT.TXT and COMPTEXT.TXT are two such files. If you build the sample viewer and register it via the FVTEXT.REG file, you will be able to use the sample viewer. Note that the system has a .TXT file viewer installed by default. To disable the default viewer, rename the vsasc8.dll file in the system\viewers subdirectory or edit FVTEXT.REG and change the .TXT extension to another extension not supported by QuickView, like XXX, and then use text files with the XXX extension. You can build the sample using Microsoft NMAKE. Be aware that building the sample produces a DLL. Once this DLL is registered, clicking with the right mouse button on one of the .TXT (XXX) files will display a context menu. Within this context menu, you will see the QuickView option. If you click on this menu item, the sample file viewer will be invoked. MORE INFORMATION ================ This sample was designed to require only small amounts of modification to build a custom viewer and the areas where you would need to make changes are clearly marked in the source code. The FileViewer component object itself used CLSID_FileViewerText:0x00021117-0000-C000-000000000046. Do not use this CLSID yourself! You will need to create your own unique CLSID using the GUIDGEN.EXE utility that comes with the SDK. This sample builds FVTEXT.DLL and places it in the C:\WINDOWS\SYSTEM\VIEWERS directory. You need to create a different name for your own Viewer and use your particular system path. Rename the following files to your custom name and make the indicated filename changes within those files. Files Description FVTEXT.CPP Main source file. Change occurrences of FVTEXT to your own name. FVTEXT.CPP Contains the CFileViewer object implementation, where most of the significant code is. There is not much in this file but the CFileViewer member functions. Most of the functions will require modification, depending on the type of viewer you plan to implement. For the most part, most of the functions and fields in CFileViewer need no modification. Those specific places needing modification are marked with MODIFY. FVTEXT.DEF Module definition file. Change the LIBRARY and DESCRIPTION lines to match your implementation. NOTE: You must export DllGetClassObject and DllCanUnloadNow. FVTEXT.H Main object header file. Change occurrences of FVTEXT to your own name. It is MOST IMPORTANT that you not use the CLSIDs defined here. These are strictly for use with this sample. Use the SDK tool GUIDGEN.EXE to generate your own unique CLSIDs. FVTEXT.ICO Icon to use for FileViewer window. Use your own icon. FVTEXT.RC Resources. Change the FVTEXT in the header and the references to fvtext.ico and fvtext.rcv to your own names. FVTEXT.RCV Version information. Change FVTEXT in the header to your own name. FVTEXT.REG Registry information for the FileViewer. Change the InprocServer32 entry (the last line) to your own DLL name. Change the extension from CPP to the extension you are supporting. MAKEFILE This is an external makefile for use with NMAKE. It is not a Visual C++ project file. In general, you will have to change the following macros definitions for a custom viewer: Macro Location Use DEFFILE Line 24 Indicates your .DEF file TARGET Line 42 Indicates the name of the FileViewer. MAKEFILE assumes you have .CPP, .H, .RC, .RCV, and .ICO files with this name and are building a .DLL with this name. The dependency list at the bottom of the file should not need any modifications unless you rename other files or add new files. If you add new files, add them to the OBJS macro at line 58. CSTATHLP.CPP Definition and implementation of a class called CStatusHelper CSTATHLP.H that simplifies WM_MENUSELECT processing. To utilize this object, create one and call its MessageMap function (see CSTATHLP.CPP for documentation). You can then call its MenuSelect function to handle all WM_MENUSELECT messages. You can also ask CStatusHelper to display a specific message in the message map by calling MessageDisplay. You pass an identifier of the message in the message map and the CStatusHelper will go locate the string and display it. CSTRTABL.CPP Definition and implementation of a CStingTable class that CSTRTABL.H simplifies stringtable management. DBGOUT.H Contains a number of macros that help keep source code clean when including debug output and conditional code. IFILEVW.CPP Implements the IFileViewer interface required of a FileViewer using a class CImpIFileViewer (defined in FVTEXT.H). You should not have to make any changes to this file. The IUnknown members are delegated to CFileViewer's IUnknown implementation. IPERFILE.CPP Implements the IPersistFile interface for a FileViewer using the class CImpIPersistFile. FILEVIEW.CPP FILEVIEW.H The master header file for the entire sample that most of the .CPP files include. It pulls in the other header files necessary for the specific viewer. In this sample, it brings in FVTEXT.H and RESOURCE.H. Your FileViewer should have a different name, so you'll want to change the reference to FVTEXT.H. FVPROC.CPP Contains the window procedures for the frame window, the viewport window, and the about box. ViewportWndProc is what generates the display of the file. This will require major modifications depending on what you plan to do.