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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
| -
| Header File
| dde.h
| Unicode
| No
| Platform Notes
| None
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WM_DDE_REQUEST
A DDE client application posts a WM_DDE_REQUEST message to a DDE server
application to request the value of a data item.
WM_DDE_REQUEST
wParam = (WPARAM) hwnd; // handle of posting application
lParam = (LPARAM) lParam; // holds cfFormat and aItem
Parameters
hwnd
Value of
wParam. Identifies the client window sending the message.
lParam
Holds the
cfFormat and
aItem parameters.
Parameter
| Description
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cfFormat
| This is the LOWORD of lParam. Specifies a standard or registered clipboard format.
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aItem
| This is the HIWORD of lParam. Contains an atom that identifies the data item requested from the server.
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Remarks
Posting
The client application posts the WM_DDE_REQUEST message by calling the
PostMessage function, not the
SendMessage function.
The client application allocates
aItem by calling the
GlobalAddAtom function.
Receiving
If the receiving (server) application can satisfy the request, it responds
with a WM_DDE_DATA message containing the requested data. Otherwise, it responds
with a negative WM_DDE_ACK message.
When responding with either a WM_DDE_DATA or WM_DDE_ACK message, the server
application can either reuse the
aItem atom or it can delete the atom and create a new one.
See Also
GlobalAddAtom,
PackDDElParam,
PostMessage,
ReuseDDElParam,
SendMessage,
UnpackDDElParam,
WM_DDE_ACK,
WM_DDE_DATA
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