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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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DdeQueryString
The DdeQueryString function copies text associated with a string handle into a buffer.
DWORD DdeQueryString(
DWORD idInst,
| // instance identifier
| HSZ hsz,
| // handle to string
| LPTSTR psz,
| // pointer to destination buffer
| DWORD cchMax,
| // length of buffer
| 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.
hsz
Identifies the string to copy. This handle must have been created by a
previous call to the DdeCreateStringHandle function.
psz
Points to a buffer that receives the string. To obtain the length of the
string, this parameter should be set to NULL.
cchMax
Specifies the length, in characters, of the buffer pointed to by the psz parameter. If the string is longer than (cchMax  1), it will be truncated. If the psz parameter is set to NULL, this parameter is ignored.
iCodePage
Specifies the code page used to render the string. This value should be either
CP_WINANSI or CP_WINUNICODE.
Return Values
If the psz parameter specified a valid pointer, the return value is the length, in
characters, of the returned text (not including the terminating null character). If
the psz parameter specified a NULL pointer, the return value is the length of the
text associated with the hsz parameter (not including the terminating null character). If an error occurs,
the return value is 0L.
Remarks
The string returned in the buffer is always null-terminated. If the string is
longer than (cchMax 1), only the first (cchMax 1) characters of the string are copied.
If the psz parameter is NULL, the DdeQueryString function obtains the length, in bytes, of the string associated with the
string handle. The length does not include the terminating null character.
See Also
DdeCmpStringHandles, DdeCreateStringHandle, DdeFreeStringHandle, DdeInitialize
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