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DllCall and structure with strings

 
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Peter



Joined: 30 Dec 2005
Posts: 448
PostPosted: Sun Jan 15, 2006 1:10 pm    Post subject: DllCall and structure with strings Reply with quote
I want to use a dll for compressing files to zip format. I found zip32.dll here.
As far as I understand it, it seems to need a structure with strings (and others) for DllCall.
Is it possible to use this DLL with strings structure in AutoHotkey?
Thanks
Code:

(From WinDll.txt included in the download:)
BOOL WINAPI ZpSetOptions(ZPOPT)
typedef struct {
LPSTR Date;             /* Date to include after */
LPSTR szRootDir;        /* Directory to use as base for zipping */
LPSTR szTempDir;        /* Temporary directory used during zipping */
BOOL fTemp;             /* Use temporary directory '-b' during zipping */
BOOL fSuffix;           /* include suffixes (not implemented in WiZ) */
BOOL fEncrypt;          /* encrypt files */
BOOL fSystem;           /* include system and hidden files */
BOOL fVolume;           /* Include volume label */
BOOL fExtra;            /* Exclude extra attributes */
BOOL fNoDirEntries;     /* Do not add directory entries */
BOOL fExcludeDate;      /* Exclude files earlier than specified date */
BOOL fIncludeDate;      /* Include only files earlier than specified date */
BOOL fVerbose;          /* Mention oddities in zip file structure */
BOOL fQuiet;            /* Quiet operation */
BOOL fCRLF_LF;          /* Translate CR/LF to LF */
BOOL fLF_CRLF;          /* Translate LF to CR/LF */
BOOL fJunkDir;          /* Junk directory names */
BOOL fGrow;             /* Allow appending to a zip file */
BOOL fForce;            /* Make entries using DOS names (k for Katz) */
BOOL fMove;             /* Delete files added or updated in zip file */
BOOL fDeleteEntries;    /* Delete files from zip file */
BOOL fUpdate;           /* Update zip file--overwrite only if newer */
BOOL fFreshen;          /* Freshen zip file--overwrite only */
BOOL fJunkSFX;          /* Junk SFX prefix */
BOOL fLatestTime;       /* Set zip file time to time of latest file in it */
BOOL fComment;          /* Put comment in zip file */
BOOL fOffsets;          /* Update archive offsets for SFX files */
BOOL fPrivilege;        /* Use privileges (WIN32 only) */
BOOL fEncryption;       /* TRUE if encryption supported, else FALSE.
                           this is a read-only flag */
int  fRecurse;          /* Recurse into subdirectories. 1 => -r, 2 => -R */
int  fRepair;           /* Repair archive. 1 => -F, 2 => -FF */
char fLevel;            /* Compression level (0 - 9) */
} ZPOPT, _far *LPZPOPT;
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shimanov



Joined: 25 Sep 2005
Posts: 610
PostPosted: Sun Jan 15, 2006 6:04 pm    Post subject: Re: DllCall and structure with strings Reply with quote
Peter wrote:
structure with strings... Is it possible to use this DLL with strings structure in AutoHotkey?

typedef struct {
LPSTR Date;
...
}


Yes.

LPSTR is a null-terminated string, and is defined as a pointer to a character (uint1) array. For example:

Code:

VarSetCapacity( struct, struct_size, 0 )

date = Sunday, January 15, 2006

EncodeInteger( &date, 4, &struct, 0 )
etc.
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Peter



Joined: 30 Dec 2005
Posts: 448
PostPosted: Sun Jan 15, 2006 8:28 pm    Post subject: Reply with quote
Thank you. Smile
I hope I can get it working now.
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Venia Legendi



Joined: 27 May 2005
Posts: 35
PostPosted: Mon Oct 09, 2006 12:48 pm    Post subject: Reply with quote
Hi Peter, did you get it working?
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Peter



Joined: 30 Dec 2005
Posts: 448
PostPosted: Wed Oct 11, 2006 8:13 am    Post subject: Reply with quote
Regarding my question about ZpSetOptions, it seems to work so far, but not the zip function itselfs. Because, as far as I understand you have to be able to use Callback for the ZpArchive function of the dll. At that point I gave up. And AFAIK it's not possible in AHK.
So, maybe it's possible to use in AHK, but it goes beyond my knowledge.
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majkinetor



Joined: 24 May 2006
Posts: 4511
Location: Belgrade
PostPosted: Wed Oct 11, 2006 8:25 am    Post subject: Reply with quote
No it is not possible to use callbacks in AHK.
That is why I urge so hard for & extension to return function address.

Acctually it is possible to do so, but it requires nasty hack and good ASM knowledge. Chris rised priority to & wish so lets hope it will come soon.

Btw, peter, you might be able to find dll that will be able to compress without callback function. I am sure you ca.
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SamuelPlentz



Joined: 26 Jul 2006
Posts: 19
PostPosted: Sun Apr 25, 2010 2:03 am    Post subject: Reply with quote
Hi, I have a similar problem. I want to call:
Code:
void __stdcall SetDefaultParams(ParamStruct* dps);

typedef struct {
    int size;
    DWORD VersionLow;
    DWORD VersionHigh;
    char FileName[MAX_PATH];
} ParamStruct;


But I can't get it to work. Here is what I got:
Code:
ParamStruct_FileName=C:\test.txt
VarSetCapacity(ParamStruct, 16, 0)
NumPut(16, ParamStruct, 0, "int")
NumPut(2 , ParamStruct, 4, "uint")
NumPut(0 , ParamStruct, 8, "uint")
;NumPut(0 , ParamStruct, 12, "uint")
EncodeInteger(&ParamStruct + 12, &ParamStruct_FileName)
DllCall("dllfile.dll\SetDefaultParams" ,"uint", &ParamStruct)

EncodeInteger(Destination, Value)
{
    DllCall("ntdll\RtlFillMemoryUlong", "Uint", Destination, "Uint", 4, "Uint", Value)
}

Perhaps it is the "char[MAX_PATH]" that makes trouble?
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[VxE]



Joined: 07 Oct 2006
Posts: 3254
Location: Simi Valley, CA
PostPosted: Sun Apr 25, 2010 5:15 am    Post subject: Reply with quote
Right, a char array in a struct is different from having a pointer to a string. The char array occupies space inside the struct equal to the size of the array. So, your struct will need to be much bigger than 16 bytes... maybe 272 bytes?
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SKAN



Joined: 26 Dec 2005
Posts: 8688
PostPosted: Sun Apr 25, 2010 6:59 am    Post subject: Reply with quote
Should be something like:

Code:
File := "C:\test.txt"
StructLen := 12 + StrLen( File ) + 1
VarSetCapacity( ParamStruct, StructLen, 0 )
NumPut( StructLen, ParamStruct, 0, "Int"  )
NumPut(  2, ParamStruct, 4, "UInt" )
StrPut( File, &ParamStruct+12 )

;DllCall("dllfile.dll\SetDefaultParams" ,"uint", &ParamStruct)

_=_______________________________________________________________________

; A function pair to read/write strings from/to memory address.

StrPut( Str, @ ) {
Return DllCall( "RtlMoveMemory", UInt,@, UInt,&Str, UInt,StrLen(Str) )
}

StrGet( @ ) {
Return DllCall( "MulDiv", int,@, int,1, int,1, "Str" )
}
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SamuelPlentz



Joined: 26 Jul 2006
Posts: 19
PostPosted: Sun Apr 25, 2010 7:35 am    Post subject: Reply with quote
Thanks for your help!
SKAN, your example works like a charm.
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