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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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DdeCreateDataHandle
The DdeCreateDataHandle function creates a dynamic data exchange (DDE) object and fills the object
with data from the specified buffer. A DDE application uses this function during
transactions that involve passing data to the partner application.
HDDEDATA DdeCreateDataHandle(
DWORD idInst,
| // instance identifier
| LPBYTE pSrc,
| // pointer to source buffer
| DWORD cb,
| // length of DDE object
| DWORD cbOff,
| // offset from beginning of source buffer
| HSZ hszItem,
| // handle to item name string
| UINT wFmt,
| // clipboard data format
| UINT afCmd
| // creation flags
| );
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Parameters
idInst
Specifies the application instance identifier obtained by a previous call to
the DdeInitialize function.
pSrc
Points to a buffer that contains data to be copied to the DDE object. If this
parameter is NULL, no data is copied to the object.
cb
Specifies the amount of memory, in bytes, to copy from the buffer pointed to
by pSrc. If this parameter is zero, the pSrc parameter is ignored.
cbOff
Specifies an offset, in bytes, from the beginning of the buffer pointed to by
the pSrc parameter. The data beginning at this offset is copied from the buffer to the
DDE object.
hszItem
Identifies the string that specifies the data item corresponding to the DDE
object. This handle must have been created by a previous call to the DdeCreateStringHandle function. If the data handle is to be used in an XTYP_EXECUTE transaction,
this parameter must be 0L.
wFmt
Specifies the standard clipboard format of the data.
afCmd
Specifies the creation flags. This parameter can be HDATA_APPOWNED, which
specifies that the server application calling the DdeCreateDataHandle function owns the data handle this function creates. This flag enables the
application to share the data handle with other Dynamic Data Exchange Management
Library (DDEML) applications rather than creating a separate handle to pass to
each application. If this flag is specified, the application must eventually
free the shared memory object associated with the handle by using the DdeFreeDataHandle function. If this flag is not specified, the handle becomes invalid in the
application that created the handle after the data handle is returned by the
application's DDE callback function or is used as a parameter in another DDEML
function.
Return Values
If the function succeeds, the return value is a data handle.
If the function fails, the return value is 0L.
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_INVALIDPARAMETER
DMLERR_MEMORY_ERROR
DMLERR_NO_ERROR
Remarks
Any unfilled locations in the DDE object are undefined.
After a data handle has been used as a parameter in another DDEML function or
has been returned by a DDE callback function, the handle may be used only for
read access to the DDE object identified by the handle.
See Also
DdeAccessData, DdeCreateStringHandle, DdeFreeDataHandle, DdeGetData, DdeInitialize
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