Advanced MFC Programming

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Chapter 16. Context Sensitive Help Button used to implement context sensitive help, whose ID is ID_CONTEXT_HELP Figure 16-2. Button used to implement context sensitive help By default, contents of help are stored in a rich text format file generated by the Application Wizard: “AfxCore.rtf”. We can find many footnotes within this file, each footnote corresponds to one help page. To implement the context sensitive help for a custom menu command, we need to add a new footnote to file “AfxCore.rtf”, and link it to the command. If the context sensitive help is enabled within the Application Wizard in step 4 (see Figure 1-1), the help project will be generated automatically. All the files used to build the help will be contained in a “hlp” directory under the project directory. For example, if we use the Application Wizard to generate an SDI application named “Help”, the help project will be generated under “Help\hlp\” directory. There will be a batch file “Makehelp.bat” under the “Help” directory. Also, there are some other important files under “Help\hlp” directory that are used to build the help. The following table lists the usages of these files: File name MakeHelp.bat *.hpj *.cnt *.hm AfxCore.rtf AfxPrint.rtf Description Batch file, make the help Help project file Help contents file Help ID mapping file Rich text format file, which need to be updated by the user to support new commands Rich text format file, which will be used to generate *.hlp file for print commands The help is compiled by a utility named “Microsoft Help Workshop”. The executable file “Hcw.exe” can be found under Visual C directory “~DevStudio\Vc\Bin\”. This utility can compile “*.hpj” file to generate a target help file. By double clicking on the “*.hpj” file or “*.cnt” file (In “Explorer”, they are described as “Help project file” and “Help contents file” respectively), we can compile the help project in the help workshop environment. Also, when we compile the application in Developer Studio, the help project will also be compiled. The help project file (“.hpj) is similar to a make file when we execute C compilers, it contains information about how to generate the target help file. The help contents file (“.cnt”) contains the information of “help topics”. If we execute Help | Help Topics command from the application, the help contents will be displayed in a “Help Topics” property sheet (Figure 16-3). All the descriptions about the commands and the application are included in “AfxCore.rtf” and “AfxPrint.rtf” files, we must edit them in order to add custom help descriptions. Sample Because the default help project already has many help items, without the knowledge of the help project, it is difficult for a programmer to add items for the newly added commands. Sample 16.1\Help is a standard SDI application generated by Application Wizard, which demonstrates how to add new help items and link them to the application commands to support context sensitive help. 482
Chapter 16. Context Sensitive Help New Commands Figure 16-3. “Help Topics” property sheet First, after the standard project is generated, four new commands are added to the application. These commands are implemented in both the mainframe menu and the tool bar, and their IDs are ID_HELPTEST_TESTA, ID_HELPTEST_TESTB, ID_HELPTEST_TESTC and ID_HELPTEST_TESTD respectively. In IDR_MAINFRAME menu, the new commands are Help Test | Test A, Help Test | Test B, Help Test | Test C, and Help Test | Test D. In the IDR_MAINFRAME tool bar, we also have four buttons corresponding to the four command IDs. The message handlers of these commands are all blank, because we just want to demonstrate how to implement context sensitive help for them. Editing “AfxCore.rtf” We must add four items to the help file in order to link a command to the help. In order to do this, we must modify file “AfxCore.rtf”. The rich text format file can be edited by a word processor like Microsoft Word (WordPad is not powerful enough for this purpose, because it does not support footnote editing). Within this file, each help item is managed as a footnote. If we want to add a new help item, we just need to add a new footnote. To show how to add a footnote to the “.rtf” file, lets assume that we want to add a footnote for ID_HELPTEST_TESTA command. Each footnote must be associated with a tag, so that it can be referenced from inside or outside the file. In Microsoft Word, we can either add number-based tags or user-defined tags. To make the tags meaningful, usually we define tags by ourselves. The tags can be any string, usually they will have some relationship with the command IDs implemented in the application. For example, we can use “help_test_A” as the tag for the footnote that will be used to implement help for the command whose ID is ID_HELPTEST_TESTA. To add a new tag within Microsoft Word, first we need to move the cursor to the bottom of the file, then execute Insert | Break… command. From the popped up dialog box, we need to check the radio button labeled “Page Break”. If we click “OK” button, a new page will be added to the file (Generally each footnote needs to use one page, so we need to add page break whenever a new footnote is added). Now execute Insert | Footnote command, and check the radio button labeled “Footnote” from the popped up dialog box (in “Insert” section). Then, check radio button labeled “Custom Mark” (in “Numbering” section) and input a ‘#’ into the edit box beside it (Figure 16-4). Finally, click “OK” button. Now the client window of Word will split into two panes, the lower of which will show all footnote tags. The caret will be placed right after the ‘#’ sign waiting for us to type in the footnote tag. We can type “help_test_A”, then click on the upper pane. Then we can input any help description for command ID_HELPTEST_TESTA. 483
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Advanced MFC Programming Supporting
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Checking a Menu Item 2.2 Right Clic
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Trapping Double Clicking Message Re
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COMMON DIALOG BOXES 7.1 File Open a
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9.1 Outputting Text Using Different
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Summary SAMPLE: SIMPLE PAINT 11.0 P
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13.2 Creating Applications without
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Functions Implementing Comparisons
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Chapter 1. Tool Bar and Dialog Bar
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Chapter 2. Menu Chapter 2 Menu Menu
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Chapter 2. Menu “clipboard”. We
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Chapter 2. Menu Using Class CMenu W
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Chapter 2. Menu ); UINT nPosition,
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Chapter 3. Splitter Window In the a
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Chapter 3. Splitter Window Sample S
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Chapter 3. Splitter Window WM_LBUTT
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Chapter 4. Button Chapter 4 Buttons
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Chapter 4. Button Use string text a
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Chapter 4. Button Now we can remove
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Chapter 4. Button Using Class MCBit
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Chapter 5. Common Controls command
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Chapter 5. Common Controls ((CSpinB
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Chapter 6. Dialog Box Chapter 6 Dia
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Chapter 6. Dialog Box void CMLDialo
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Chapter 6. Dialog Box } Function CP
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Chapter 6. Dialog Box Everything is
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Chapter 6. Dialog Box } MINMAXINFO;
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Chapter 6. Dialog Box Sample Sampel
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Chapter 6. Dialog Box } brush=(HBRU
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Chapter 6. Dialog Box wndA.GetWindo
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Chapter 6. Dialog Box rectStaticGrp
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Chapter 6. Dialog Box pWndCtrl=GetW
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Chapter 6. Dialog Box Sample 6.8-2\
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Chapter 6. Dialog Box 1) Tracking s
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Chapter 7. Common Dialog Boxes DWOR
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Chapter 8. DC, Pen, Brush and Palet
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Chapter 9. Font Function CDocument:
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Chapter 10. Bitmap ); DWORD dwRop T
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Chapter 11. Sample: Simple Paint Af
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Chapter 13. Adding Special Features
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Chapter 14. Views ID_EDIT_PASTE pas
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Page 507 and 508: Appendix A. Virtual-key Codes Appen
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Page 517 and 518: Index Index #if, 416 #pragma, 416 .
Page 519 and 520: Index CDC::SetPixel, 321 CDC::SetRO
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Page 523 and 524: Index CWnd::SetMenu, 55 CWnd::SetTi
Page 525 and 526: Index HBRUSH, 201 HCURSOR, 262 HDAT
Page 527 and 528: Index Background palette, 224 Chang
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