DdeQueryConvInfo function (ddeml.h)

Retrieves information about a Dynamic Data Exchange (DDE) transaction and about the conversation in which the transaction takes place.

Syntax

UINT DdeQueryConvInfo(
  HCONV     hConv,
  DWORD     idTransaction,
  PCONVINFO pConvInfo
);

Parameters

hConv

Type: HCONV

A handle to the conversation.

idTransaction

Type: DWORD

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

Type: PCONVINFO

A pointer 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 value

Type: UINT

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.

The DdeGetLastError function can be used to get the error code, which can be one of the following values:

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.

Requirements

   
Minimum supported client Windows 2000 Professional [desktop apps only]
Minimum supported server Windows 2000 Server [desktop apps only]
Target Platform Windows
Header ddeml.h (include Windows.h)
Library User32.lib
DLL User32.dll

See also

CONVINFO

Conceptual

DdeClientTransaction

DdeConnect

DdeConnectList

DdeKeepStringHandle

DdeQueryNextServer

Dynamic Data Exchange Management Library

Reference