Mailing-List: contact cygwin-help@sourceware.cygnus.com; run by ezmlm List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@sources.redhat.com Delivered-To: mailing list cygwin@sources.redhat.com Message-ID: <00d801c0c9ee$5ebc44d0$0200a8c0@lifelesswks> From: "Robert Collins" To: "Christian Lescher" , "Larry Hall \(RFK Partners, Inc\)" Cc: "Lescher Christian" , "'Andrew Markebo'" , "Troy Noble" , References: <4.3.1.2.20010420103953.022a2700@pop.ma.ultranet.com> <4.3.1.2.20010420122559.0224b5f0@pop.ma.ultranet.com> <3AE07C0B.928C7680@lescher.de> Subject: Re: AW: DLL function with string result? Date: Sat, 21 Apr 2001 09:05:16 +1000 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-2" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4133.2400 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4133.2400 X-OriginalArrivalTime: 20 Apr 2001 22:57:24.0199 (UTC) FILETIME=[436C7F70:01C0C9ED] ----- Original Message ----- From: "Christian Lescher" To: "Larry Hall (RFK Partners, Inc)" Cc: "Lescher Christian" ; "'Andrew Markebo'" ; "Troy Noble" ; Sent: Saturday, April 21, 2001 4:12 AM Subject: Re: AW: DLL function with string result? > I found that in windowsx.h of cygwin/gcc there are the following functions defined: > > #define GlobalAllocPtr(flags,cb) (GlobalLock(GlobalAlloc((flags),(cb)))) > #define GlobalFreePtr(lp) (GlobalUnlockPtr(lp),(BOOL)GlobalFree(GlobalPtrHandle(lp))) > > May these functions also be used for copying a string? How must they be used? (Maybe this works also for string > 64 KB?!) > Is this also a way for interworking of Borland and Visual? I'd like to point out that /dec/clipboard in cygwin uses standard malloc, which IIRC strdup does as well. /dev/clipboard handles multi-megabyte copy and pastes. There are _no_ issues that I know of with strings > 64Kb in cygwin. 64Kb is the largest size of a single segment in x86 processors running in real mode. Some of the early win9x series microsoft class libraries & utilities had a 64Kb limit on various things because (As I understand it) they were not fully ported to protected mode when win95 came out. If you are seeing 64Kb issues I suggest you do the following. In your compiler environment (ie if your prog is in Visual, your library in Cygwin then I mean in visual), write a test case. If that works then it's either a interop issue or a problem with the library compiler. Rob > Christian > > | char* > | mallocAndStrCpy (const char* srcStr) { > | if (srcStr == NULL) > | return NULL; > | return strdup(srcStr); > | } > > > > > -- > Want to unsubscribe from this list? > Check out: http://cygwin.com/ml/#unsubscribe-simple > > -- Want to unsubscribe from this list? Check out: http://cygwin.com/ml/#unsubscribe-simple