Advanced MFC Programming

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Chapter 16. Context Sensitive Help hszAppName Handle of the item name, must be obtained by calling function ::DdeCreateStringHandle() The server must check if it supports the topic and the specific item, as well as the data format. If it supports all of them, the server must prepare data using the required format and send the data back to client. Preparing Data One way to send data to the client is to prepare data in server’s local buffers, then create a handle for this data, and send the handle to the client. The data handle can be obtained by calling function ::DdeCreateDataHandle(…), which has the following format: HDDEDATA DdeCreateDataHandle ( DWORD idInst, LPBYTE pSrc, DWORD cb, DWORD cbOff, HSZ hszItem, UINT wFmt, UINT afCmd ); The data can also be sent through a pointer. We will discuss this in a later section. The following table explains the meanings of the above parameters: Parameter idInst pSrc cb cbOff hszItem wFmt afCmd Meaning Instance identification obtained from DDE initialization Pointer to the buffers which hold the data The length of the data in bytes Specify the offset from the beginning of the buffer String handle, indicating the item name Indicates the data format The creation flags which indicates who is responsible for freeing the data We can use standard clipboard format such CF_TEXT, CF_DIB to pass data. If we define a special data format, we must register it before passing the data. Receiving Data Because data is not sent directly, the client must obtain the required data from the handle first. For synchronous transmission mode, the data handle will be returned directly from function ::DdeClientTransacton(). In case the transaction is not successful, a NULL value will be returned. After receiving the handle, the client must first call function ::DdeAccessData(…) to access the data. After the data is processed, function ::DdeUnaccessData(…) must be called to “unaccess” the data. If the data is created with HDATA_APPOWNED flag, the client should not free the data. Otherwise, it can release the data by calling function ::DdeFreeDataHandle(…). Samples In the sample application, an item “Time” is supported by the server under “Topic” topic name. When the client request an XTYPE_REQUEST transaction on this item, the server get the current system time and send it to the client. The client then displays the time in one of its edit box. Compared with the samples in the previous section, a new edit box and a button labeled “Request” are added to the dialog box (Figure 15-3). The edit box is read-only, which will be used to display the time obtained from the server. The button is used to let the user initiate the request transaction. 468
Chapter 16. Context Sensitive Help “Time” item Figure 15-3. “Time” item under “Topic” topic The following function shows how the client initiates the transaction after the user clicks “Request” button, and how the client updates the time displayed in the edit box if the transaction is successful: void CDDECliDlg::OnButtonRequest() { HSZ hszTimeItem; HDDEDATA hData; LPBYTE lpByte; } hszTimeItem=ObtainHsz(TEXT("Time")); hData=::DdeClientTransaction ( NULL, 0, m_hConvClient, hszTimeItem, CF_TEXT, XTYP_REQUEST, 5000, NULL ); if(hData != NULL) { lpByte=::DdeAccessData(hData, NULL); m_szTimeItem=lpByte; ::DdeUnaccessData(hData); ::DdeFreeDataHandle(hData); UpdateData(FALSE); } UnobtainHsz(hszTimeItem); The following code fragment shows how the server responds to message XTYPE_REQUEST, prepares data and sends it to the client: …… case XTYP_REQUEST: { if ( !::DdeCmpStringHandles(hszTopic, m_hszTopicName) && !::DdeCmpStringHandles(hszItemName, m_hszTimeItem) && wFormat == CF_TEXT ) { CTime time; CString szTime; HDDEDATA hData; time=CTime::GetCurrentTime(); szTime=time.Format("%H:%M:%S"); 469
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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 2. Menu void CMenuDoc::OnEd
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Chapter 3. Splitter Window function
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Chapter 3. Splitter Window BOOL CSp
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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 Now we can remove
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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 Sample Sampel
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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 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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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
Page 529 and 530: Index Default tool bar, 1 Enable or
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