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vrf Copy and Paste

Question asked by VRFuser on Aug 26, 2002

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> I am running NT4 sp6.

I'm running NT 5 (W2K that is) but it should still work fine. I don't
understand why VEESpy should be having a problem with NT4 as it only uses
exports that have been around since Windows version 3, but then again this
is one of the reasons people hate Windows!

Let me think on this for a little while.
-SHAWN-

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VRFuser Aug 25, 2002 6:53 PM
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Hi all,

Does anybody know how to pass data to and from the copy/paste buffer? I've had a look at the user32 functions but can't get any to work.

Regards

Ian Williams

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VRFuser Aug 25, 2002 8:26 PM
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Hi all,

Does anybody know how to pass data to and from the copy/paste buffer? I've had a look at the user32 functions but can't get any to work.

Regards

Ian Williams

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VRFuser Aug 26, 2002 3:48 PM
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Shawn,
I also get get the same stack pointer corruption errors, in this program in "EnumProcesses" and in "veespy".These look like they would be powerfull tools but I can't seem to get past the stack errors. I
am running NT4 sp6.
any info?
Thanks,

"WILLIAMS,IAN (A-Scotland,ex1)" wrote:

> Hi Shawn,
>
> Thanks for your efforts, and yes you were right, it was the SetClipboardData function that was giving me grief. Anyway I've tried the example(s) but I'm still having trouble, I seem to get the error
>
> Stack pointer corrupted after return from compiled function <GetWindowsDirectoryA>.
>
> To get round this I hard coded the windows path an re-ran the program, this time I get
>
> Stack pointer corrupted after return from compiled function <GlobalAlloc>.
>
> I have tried this on both xp and windows 2000, both give the same error, am I doing something stupid?
>
> Regards
>
> Ian Williams
>
> -----Original Message-----
> From: Shawn Fessenden [mailto:shawnf@ameritech.net]
> Sent: 26 August 2002 15:54
> To: VEE vrf
> Subject: [vrf] RE: Copy and Paste
>
> Hi Ian.
>
> > Does anybody know how to
> > pass data to and from the
> > copy/paste buffer?
>
> Mighty useful, that.
>
> > I've had a look at the user32
> > functions but can't get any to work.
>
> Well OpenClipboard and EmptyClipboard are easy enough. I imagine it's
> SetClipboardData that's giving you fits. It's perfectly acceptable to pass a
> zero to OpenClipboard.
>
> The hMem parameter of SetClipboardData is another matter. The docs are a
> little vague, and you have to read all the way to the end of the param
> description to find the catch:
>
>   "If the hMem parameter identifies a memory object,
>    the object must have been allocated using the
>    GlobalAlloc function with the GMEM_MOVEABLE and
>    GMEM_DDESHARE flags."
>
> Ok, so assuming VEE has a string to copy to the clipboard and a block of
> memory allocated in the specified fashion, the next problem is actually
> getting the string into that memory. This is where RtlMoveMemory comes in.
> RtlCopyMemory could be used just as well, but Move is smarter.
>
> Anyway, attached are two VEE programs that copy text to the clipboard.
> CopyToClipboard copies one line of text to the clipboard.
> CopyArrayToClipboard copies an array of text to the clipboard using a CRLF
> to separate each string.
>
> As far as copying *from* the clipboard goes, you basically reverse the
> process, using GetClipboardData(1) to get a handle to clipboard memory. Call
> GlobalLock to get a pointer for the handle, then RtlMoveMemory to move the
> data to a VEE string. Call GlobalUnlock to unlock the memory, but don't try
> to free the memory. Once you call SetClipboardData, Windows is responsible
> for managing the memory represented by the handle.
>
> Ok, so text is fine. What about other kinds of data? Well, if you can get a
> pointer to it (think Arrays in VEE) you can copy it to the clipboard. In
> this case, your clipboard formats are numbers in the range #H200 to #H2FF.
> -SHAWN-
>
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--
Steve Boerman
SR. MMIC Engineer
ext 4477, lab 4608

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VRFuser Aug 26, 2002 9:14 PM
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Ian -

> Stack pointer corrupted after
> return from compiled function

I'm sorry! I keep forgetting that everybody is leaving me in the dust with
VEE 6. Jeff just had the same problem.

The problem is that VEE 6 needs the linkage declaration

__stdcall

tagged on to all imported functions. Open the constant text arrays that
define imported functions in all the aforementioned programs. They are in
LoadLibs and have names like User, Kernel, Psapi and so on. Add __stdcall to
the beginning of all of them.

Instead of:

int GlobalAlloc(int uFlags, int dwBytes);

it would be:

__stdcall int GlobalAlloc(int uFlags, int dwBytes);

Do this to all declarations and everything will work out fine. Sorry again
folks!
-SHAWN-

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