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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| Yes
| Import Library
| user32.lib
| Header File
| ddeml.h
| Unicode
| No
| Platform Notes
| None
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DdeQueryConvInfo
The DdeQueryConvInfo function obtains information about a dynamic data exchange (DDE) transaction
and about the conversation in which the transaction takes place.
UINT DdeQueryConvInfo(
HCONV hConv,
| // handle to conversation
| DWORD idTransaction,
| // transaction identifier
| PCONVINFO pConvInfo
| // pointer to structure with conversation data
| );
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Parameters
hConv
Identifies the conversation.
idTransaction
Specifies the transaction. For asynchronous transactions, this parameter
should be a transaction identifier returned by the DdeClientTransaction function. For synchronous transactions, this parameter should be QID_SYNC.
pConvInfo
Points to the CONVINFO structure that receives information about the transaction and conversation.
The cb member of the CONVINFO structure must specify the length of the buffer allocated for the structure.
Return Values
If the function succeeds, the return value is the number of bytes copied into
the CONVINFO structure.
If the function fails, the return value is FALSE.
Errors
The DdeGetLastError function can be used to get the error code, which may be one of the following
values:
DMLERR_DLL_NOT_INITIALIZED
DMLERR_NO_CONV_ESTABLISHED
DMLERR_NO_ERROR
DMLERR_UNFOUND_QUEUE_ID
Remarks
An application should not free a string handle referenced by the CONVINFO structure. If an application must use one of these string handles, it should
call the DdeKeepStringHandle function to create a copy of the handle.
If the idTransaction parameter is set to QID_SYNC, the hUser member of the CONVINFO structure is associated with the conversation and can be used to hold data
associated with the conversation. If idTransaction is the identifier of an asynchronous transaction, the hUser member is associated only with the current transaction and is valid only for
the duration of the transaction.
See Also
CONVINFO, DdeClientTransaction, DdeConnect, DdeConnectList, DdeKeepStringHandle, DdeQueryNextServer
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