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UNLHA32.DLL Ver 0.97 Windows Messages
Copyright(C)1998 by Micco
Translated by Hitoshi Ozawa
Release 1998/01/17
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%1. API Specification
%2. UNLHA32.DLL Windows Messages
%3. ARCHIVERPROC Definition
%4. EXTRACTINGINFO Structure
%5. EXTRACTINGINFOEX Structure
%6. Process Flow
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To sent file extraction progress information to the window which
called UNLHA.DLL, specify the '-n' option. However, a window must be
set to receive this information using the following APIs.
Ü·B
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%1. API Specification
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BOOL WINAPI UnlhaSetOwnerWindow(HWND _hwnd)
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Description
Specify window handle to send UNLHA32.DLL messages.
Return Code
TRUE Window attached.
FALSE Unable to set window or UNLHA.DLL message already set to
other window.
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BOOL WINAPI UnlhaClearOwnerWindow(VOID)
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Description
Release windows attached by UnlhaSetOwnerWindow() function.
Return Code
TRUE Window released.
FALSE Unable to release window. UNLHA.DLL currently being used.
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BOOL WINAPI UnlhaSetOwnerWindowEx(HWND _hwnd, LPARCHIVERPROC _lpArcProc)
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Description
Specify function to receive extraction information. If
_lpArcProc is set to NULL, messages will be sent to window
pointed _hwnd.
Return Code
TRUE No error
FALSE Error - UNLHA32.DLL currently extraction file or
different processing using the specified window.
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BOOL WINAPI UnlhaKillOwnerWindowEx(HWND _hwnd)
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Description
Release window set by UnlhaSetOwnerWindowEx().
Return Code
TRUE No error
FALSE Error - Windows currently being used.
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%2. UNLHA32.DLL Windows Messages
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wm_arcextract
wm_arcextract
nMode = (int)wParam /* status */
lpEis = (EXTRACTINGINFO FAR *)lParam /* pointer to structure */
wm_arcextract contains information on file (file name and size) to
be extracted by UNLHA32.DLL. wm_arcextract message is sent from
UNLHA32.DLL to a window specified in UnlhaSetOwnerWindow().
nMode wParam. Display UNLHA32.DLL progress.
0 : UNLHA.DLL is about to start processing specified file
1 : UNLHA.DLL is currently processing specified file
2 : UNLHA.DLL has finished processing file and is releasing
lpEis memory.
3 : UNLHA32.DLL is about to start processing on the archive
file. Archive file name is set to szSour-
ceFileName.
4 : UNLHA32.DLL is about to start writing from the temporary
file. Archive file name is set to szSour-
ceFileName.
lpEis lParam Pointer toi buffer containing file
information (in EXTRACTINGINFO
structure).
Return Code
@Application that processes this message must return 0. If non-zero
value is returned, UNLHA32.DLL will terminate file extraction. On the
other hand, extraction may be terminated by returning non-zero value.
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%3. ARCHIVERPROC Definition
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typedef BOOL CALLBACK ARCHIVERPROC(HWND _hwnd, UINT _uMsg,
UINT _nState, LPEXTRACTINGINFOEX _lpEis);
_hwnd Window handle set by SetOwnerWindowEx.
_uMsg Currently set to wm_arcextract.
_nState wParam in wm_arcextract. ie. value of nMode.
_lpEis Pointer to EXTRACTINGINFOEX structure which contains
information on files in the archive.
To have UNLHA32.DLL continue with the process, set ARCHIVERPROC to
TRUE. To terminate, set ARCHIVERPROC to FALSE. However, if UNLHA32.DLL
is copying back from the temporary file, the process can not be
terminated.
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%4. EXTRACTINGINFO Structure
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Type Definition
typedef struct {
DWORD dwFileSize;
DWORD dwWriteSize;
char szSourceFileName[FNAME32_MAX + 1];
char dummy1[3];
char szDestFileName[FNAME32_MAX + 1];
char dummy[3];
} EXTRACTINGINFO
Member Declaration
dwFileSize size of file to be extracted
dwWriteSize actual size of extracted file
szSourceFileName archive file name
szDestFileName destination file name
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%5. EXTRACTINGINFOEX Structure
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Type Definition
typedef struct {
EXTRACTINGINFO exinfo;
DWORD dwCompressedSize;
DWORD dwCRC;
UINT uOSType;
WORD wRatio;
WORD wDate;
WORD wTime;
char szAttribute[8];
char szMode[8];
} EXTRACTINGINFOEX;
exinfo EXTRACTINGINFO structure
dwCompressedSize Size of file after compression
dwCRC Check sum of file
uOSType OS used to compress file
wRatio Compression ratio of compressed file
wDate Date of compressed file (MS-DOS format)
wTime Time of compressed file (MS-DOS format)
szAttribute File attribute of compressed file
szMode String containging compression method
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%6. Process Flow
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1. Send message in nMode 3 to get archive file name.
2. For each file in the archive, send message in nMode 0 to get file
name.
When extracting or compressing a file, following messages are sent:
3. Send message in nMode 0. Able to get file to being operated.
4. Send message in nMode 1. Able to get number of bytes written.
This message is sent until file is entirely extracted.
When processing an archive file, following messages pertaining to
temporary file are sent:
5. Send message in nMode 4. Able to get temporary file name.
6. Send message in nMode 1. Able to get number of bytes written.
This message is sent until temporary file is fully written back.
When all processes are finished:
7. Send message in nMode 2.
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