How to Respond When DDE Data Cannot Be Locked

Last reviewed: January 5, 1995
Article ID: Q67653

The information in this article applies to:

Microsoft Windows Software Development Kit (SDK) for Windows versions 3.0 and 3.1

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 "Microsoft Windows Software Development Kit Reference Volume 2."

Additional reference words: 3.00 3.10
KBCategory: kbprg
KBSubcategory: UsrDde

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Last reviewed: January 5, 1995
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