Microsoft KB Archive/67653

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How to Respond When DDE Data Cannot Be Locked

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Q67653

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The information in this article applies to:


 * Microsoft Windows Software Development Kit (SDK) versions 3.0, 3.1

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SUMMARY
A Dynamic Data Exchange (DDE) client application receives a WM_DDE_DATA message when the DDE server has data to transmit. The low-order word of lParam contains the handle to a global memory object containing the data. If the DDE client is unable to lock the handle to access the data [GlobalLock returns NULL], the DDE client should send a negative acknowledgment to the DDE server. A negative acknowledgment is a WM_DDE_ACK message with the fAck bit set to zero.

DDE is discussed in Chapter 15 of the &quot;Microsoft Windows Software Development Kit Reference Volume 2.&quot;

Additional query words: 3.00 3.10

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Issue type :

Technology : kbAudDeveloper kbWin3xSearch kbSDKSearch kbWinSDKSearch kbWinSDK300 kbWinSDK310