How to remove a Toolbox component, an OLE Control, or a Component Gallery component from a Visual C++ project

MORE INFORMATION

Step-by-step procedure

1. If you are attempting to remove a Toolbox component from your project, you may delete the component from the Visual Studio .NET designers. Any event handlers that you have added, such as the Click event handler for a button, must be manually deleted from your code (both the .cpp and .h files) because the designer does not delete the event handlers automatically.
2. In Visual C++ 6.0, if you are attempting to remove a Component Gallery component from your project, read the Results section of the component's Help file to find out what the component inserts into your application. If you are attempting to remove an OLE Control from your project, locate the wrapper classes for the OLE Control that have been inserted into your project.
3. Remove the source code files that were inserted into your project. Generally, these are source files that define the class and relevant code for the OLE Control or Component. For example, the Password Dialog Component creates and adds the PWDLG1.CPP and PWDLG1.H files to your project.
4. If you are attempting to remove a Component Gallery component, remove any code that is inserted into existing code files. For example, several Components insert code into a project's InitInstance() function. To find all occurrences of inserted code, search for "// CG:" in your .cpp files. This comment precedes each code insertion that was made to your application. Also, be sure to remove any added member declarations in the .h files, and make sure your remove all appropriate header files from these same source files. For example, to remove the Password Dialog Component from your project, remove the following from all files in your project:

         #include "pwdlg1.h"
   						

   When you remove code, be sure to remove any associated message map entries. For example, the Clipboard Assistant Component adds a number of message map entries to a project.
5. Remove any added resources. For example, the Password Dialog Component inserts a dialog resource into the project's resource file (.rc).

In addition to the previous steps, some OLE Controls and Component Gallery components insert data at the end of your project's .mak file for Visual C++, versions 4.x. This data does not affect your project but might prevent you from reinserting the Control or Component later. Developer Studio uses this data to determine which controls to display in its Controls toolbar.

In Visual C++, versions 5.0 and 6.0, this information is stored in the .dsp file, and the following instructions do not apply. Similar troubleshooting methods can remove this information from the .dsp file, but directly modifying the project file is unsupported.

In Visual C++, versions 4.x, you can identify this data by the Section keyword. For example, inserting the Splash Screen Component adds the following text to your project's .mak or file:

   #####################################################################
   # Section SplashIt : {21FFBCBF-33A6-11CF-9420-00AA00C14AF9}
   #   0:8:Splash.h:C:\SplashIt\Splash.h
   #   0:10:Splash.cpp:C:\SpashIt\Splash.cpp
   #   1:10:IDB_SPLASH:102
   #   2:10:ResHdrName:resource.h
   #   2:11:ProjHdrName:stdafx.h
   #   2:10:WrapperDef:_SPLASH_SCRN_
   #   2:12:SplClassName:CSplashWnd
   #   2:21:SplashScreenInsertKey:4.0
   #   2:10:HeaderName:Splash.h
   #   2:10:ImplemName:Splash.cpp
   #   2:7:BmpID16:IDB_SPLASH
   # End Section
   #####################################################################
				

To allow for re-inserting the Splash Screen Component, this section of text must first be removed from the project's .mak or file.

Warning Remove only the entries for the component you want to delete. Do not delete another component's entry that you may still need to keep.

To determine which Section entries belong to a particular component, you should create a new MFC project, insert the component in question, and examine this new project's .mak file. Then you can remove the identical Section entries from the original project.