Advanced MFC Programming

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Chapter 16. Context Sensitive Help ); We need to pass different types of data to parameters pData, cbData, wFmt and wType for different types of transactions. If the transaction requires the client to pass data to the server (Besides data request transaction, there exist other transactions that can be used by the client to send data to server), we need to use parameters pData and cbData to pass the data, and use parameter wFmt to specify the data format. If the client is requesting data from the server, it should specify the format of data by passing standard or userdefined format to parameter wFmt. In case the client is not sending data to the server, we can neglect parameters pData and cbData. Parameter wType can be used to specify the type of transaction the client is requesting from the server. In the case of data request transaction, this parameter must be set to XTYP_REQUEST. The meanings of the rest four parameters are the same for all types of transactions, which are listed in the following table: Parameter hConv hszItem dwTimeout pdwResult Meaning Conversation handle obtained from function ::DdeConnect() Handle of the item name which is obtained from function ::DdeCreateStringHandle(…) Specifies how long the client will wait before the function returns, specific for synchronous transmission A pointer that can be used to retrieve the result of the transaction 466
Chapter 16. Context Sensitive Help Server Client DDE Initialization DDE Initialization Name service registration XTYP_CONNECT Make connection Return TRUE, Connection made XTYP_CONNECT_ONFIRM Transactions XTYP_DISCONNECT Terminate conversation Conversation over Figure 15-2. DDE Connection and disconnection For synchronous transmission mode (the asynchronous transmission mode will be introduced in a later section), after the client calls this function, a timer will be set (the time out value is specified by parameter dwTimeout). If there is no response from the server, the function does not return until the timer times out. We can specify an appropriate value to prevent the program from getting into the deadlock. Data Request Transaction: Server Side Calling this function from the client side will cause the server to receive an XTYP_REQUEST message. The server should check parameter uFmt, hConv, hszTopic and hszAppName, whose meanings are listed in the following table: Parameter Meanings uFmt Data format specified by the client hconv The conversation handle, which is obtained at the conversation setup stage hszTopic Handle of the topic name, must be obtained by calling function ::DdeCreateStringHandle() 467
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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 Using Class CMenu W
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Chapter 2. Menu ); UINT nPosition,
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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 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 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 10. Bitmap Sample 10.1-2\GD
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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
Page 521 and 522: Index CRectTracker, 345 CRectTracke
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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