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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
| WinNT
| Platform Notes
| None
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DdeCreateStringHandle
The DdeCreateStringHandle function creates a handle that identifies the string pointed to by the psz parameter. A dynamic data exchange (DDE) client or server application can
pass the string handle as a parameter to other Dynamic Data Exchange Management
Library (DDEML) functions.
HSZ DdeCreateStringHandle(
DWORD idInst,
| // instance identifier
| LPTSTR psz,
| // pointer to null-terminated string
| int iCodePage
| // code page identifier
| );
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Parameters
idInst
Specifies the application instance identifier obtained by a previous call to
the DdeInitialize function.
psz
Points to a buffer that contains the null-terminated string for which a handle
is to be created. This string may be up to 255 characters. The reason for this
limit is that DDEML string management functions are implemented using global
atoms.
iCodePage
Specifies the code page used to render the string. This value should be either
CP_WINANSI (the default code page) or CP_WINUNICODE, depending on whether the
ANSI or Unicode version of DdeInitialize was called by the client application.
Return Values
If the function succeeds, the return value is a string 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_INVALIDPARAMETER
DMLERR_NO_ERROR
DMLERR_SYS_ERROR
Remarks
The value of a string handle is not related to the case of the string it
identifies.
When an application either creates a string handle or receives one in the
callback function and then uses the DdeKeepStringHandle function to keep it, the application must free that string handle when it is
no longer needed.
An instance-specific string handle cannot be mapped from string handle to
string and back to string handle. This is shown in the following example, in which
the DdeQueryString function creates a string from a string handle and DdeCreateStringHandle creates a string handle from that string, but the two handles are not the
same:
DWORD idInst;
DWORD cb;
HSZ hszInst, hszNew;
PSZ pszInst;
DdeQueryString(idInst, hszInst, pszInst, cb, CP_WINANSI);
hszNew = DdeCreateStringHandle(idInst, pszInst, CP_WINANSI);
// hszNew != hszInst !
See Also
DdeAccessData, DdeCmpStringHandles, DdeFreeStringHandle, DdeInitialize, DdeKeepStringHandle, DdeQueryString
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