BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  memory stream parsing          BorlandTalk.com Forum Index -> C++ Builder (Native API) View previous topic :: View next topic   Author Message xa Guest Posted: Sun May 15, 2005 5:44 pm    Post subject: memory stream parsing I have some html code stored in a memory stream and i need to strip out the "rn" prior to assigning the dat afor display... can anyone show me an effective way of doing this please.. Back to top Liz Albin Guest Posted: Sun May 15, 2005 6:12 pm    Post subject: Re: memory stream parsing On Sun, 15 May 2005 18:44:48 +0100, xa wrote: Quote: I have some html code stored in a memory stream and i need to strip out the "rn" prior to assigning the dat afor display... can anyone show me an effective way of doing this please.. If you can put your data in an AnsiString you can use StringReplace() -- Good luck, liz Back to top Vladimir Stefanovic Guest Posted: Sun May 15, 2005 7:19 pm    Post subject: Re: memory stream parsing You can easily access single bytes inside TMemoryStream, and further make some logic by yourself. The easiest way is to use temporary memory stream to get rid of unnecessary "rn" but you still can use only (the original) one, but with more logic involved. This code (UNTESTED) should get rid of all "r" or "n", not only sequences of them. I's not so hard to extend the code to search for sequences only. // UNTESTED !!! To check the code place a file "file.txt" in the //same root where your EXE is placed, and after Button1Click, the //second file should be created "file2.txt". void __fastcall TForm1::Button1Click(TObject *Sender) { TMemoryStream *MS_OLD = NULL; TMemoryStream *MS_NEW = NULL; try { try { MS_OLD = new TMemoryStream; MS_NEW = new TMemoryStream; MS_OLD->LoadFromFile( ExtractFilePath( ParamStr(0) ) + "file.txt" ); for ( int i=0; i<MS_OLD->Size ; i++ ) { if ( (((char*)(MS_OLD->Memory))[i] != 'r') && (((char*)(MS_OLD->Memory))[i] != 'n') ) { MS_NEW->WriteBuffer( &((char*)(MS_OLD->Memory))[i] , 1 ); } } MS_NEW->SaveToFile( ExtractFilePath( ParamStr(0) ) + "file2.txt" ); } catch ( const Exception &e ) { ShowMessage( "Error" ); } } __finally { if ( MS_OLD ) delete MS_OLD; if ( MS_NEW ) delete MS_NEW; } } -- Best regards, Vladimir Stefanovic "xa" <pageme (AT) ntlworld (DOT) com> wrote Quote: I have some html code stored in a memory stream and i need to strip out the "rn" prior to assigning the dat afor display... can anyone show me an effective way of doing this please.. Back to top Vladimir Stefanovic Guest Posted: Sun May 15, 2005 7:31 pm    Post subject: Re: memory stream parsing To extend the code to search for sequences "rn", you can do something like this (untested again): Quote: for ( int i=0; i<MS_OLD->Size ; i++ ) for ( int i=0; i<MS_OLD->Size-1; i++ ) Quote: if ( (((char*)(MS_OLD->Memory))[i] != 'r') && (((char*)(MS_OLD->Memory))[i] != 'n') ) if ( (((char*)(MS_OLD->Memory))[i] != 'r') && (((char*)(MS_OLD->Memory))[i+1] != 'n') ) Quote: MS_NEW->WriteBuffer( &((char*)(MS_OLD->Memory))[i] , 1 ); MS_NEW->WriteBuffer( &((char*)(MS_OLD->Memory))[i] , 1 ); ++i; //<--- THIS IS ADDED -- Best regards, Vladimir Stefanovic Back to top xa Guest Posted: Mon May 16, 2005 3:39 am    Post subject: Re: memory stream parsing Thanks Vladimir. "Vladimir Stefanovic" <antivari (AT) po (DOT) sbb.co.yu> wrote Quote: To extend the code to search for sequences "rn", you can do something like this (untested again): for ( int i=0; i<MS_OLD->Size ; i++ ) for ( int i=0; i<MS_OLD->Size-1; i++ ) if ( (((char*)(MS_OLD->Memory))[i] != 'r') && (((char*)(MS_OLD->Memory))[i] != 'n') ) if ( (((char*)(MS_OLD->Memory))[i] != 'r') && (((char*)(MS_OLD->Memory))[i+1] != 'n') ) MS_NEW->WriteBuffer( &((char*)(MS_OLD->Memory))[i] , 1 ); MS_NEW->WriteBuffer( &((char*)(MS_OLD->Memory))[i] , 1 ); ++i; //<--- THIS IS ADDED -- Best regards, Vladimir Stefanovic Back to top Vladimir Stefanovic Guest Posted: Mon May 16, 2005 4:35 pm    Post subject: Re: memory stream parsing I made some late changes, and now I think that this must work: void __fastcall TForm1::Button1Click(TObject *Sender) { TMemoryStream *MS_OLD = NULL; TMemoryStream *MS_NEW = NULL; try { try { MS_OLD = new TMemoryStream; MS_NEW = new TMemoryStream; MS_OLD->LoadFromFile( ExtractFilePath( ParamStr(0) ) + "file.txt" ); for ( int i=0; i<MS_OLD->Size-1 ; i++ ) { if ( (((char*)(MS_OLD->Memory))[i] == 'r') && (((char*)(MS_OLD->Memory))[i+1] == 'n') ) { ++i; } else { MS_NEW->WriteBuffer( &((char*)(MS_OLD->Memory))[i] , 1 ); } } MS_NEW->SaveToFile( ExtractFilePath( ParamStr(0) ) + "file2.txt" ); } catch ( const Exception &e ) { ShowMessage( "Error" ); } } __finally { if ( MS_OLD ) delete MS_OLD; if ( MS_NEW ) delete MS_NEW; } } -- Best regards, Vladimir Stefanovic Back to top Jonathan Benedicto Guest Posted: Mon May 16, 2005 4:56 pm    Post subject: Re: memory stream parsing "Vladimir Stefanovic" <antivari (AT) po (DOT) sbb.co.yu> wrote Quote: I made some late changes, and now I think that this must work: Not to discount your code, but isn't this a little simpler: AnsiString Data = AnsiString(Stream->Memory, Stream->Size); Data = StringReplace(Data, "rn", "", TReplaceFlags() << rfReplaceAll); Stream->Clear(); Stream->Write(Data.c_str(), Data.Length()); Jonathan Back to top Remy Lebeau (TeamB) Guest Posted: Mon May 16, 2005 5:12 pm    Post subject: Re: memory stream parsing "Vladimir Stefanovic" <antivari (AT) po (DOT) sbb.co.yu> wrote Quote: // UNTESTED !!! You don't need a second stream, you can modify the source stream's data directly, ie: { TMemoryStream *MS = new TMemoryStream; // fill stream as needed... LPBYTE Original = static_cast<LPBYTE>(MS->Memory); LPBYTE Ptr = Original; LPBYTE End = (Original + MS->Size); while( Ptr < End ) { if( IS_CR_OR_LF(*Ptr) ) { LPBYTE Temp = (Ptr + 1); while( (Temp < End) && IS_CR_OR_LF(*Temp) ) ++Temp; ::MoveMemory(Ptr, Temp, End - Temp); End -= (Temp - Ptr); } else ++Ptr; } MS->Size = (End - Original); // use new stream data as needed... delete MS; } Gambit Back to top Vladimir Stefanovic Guest Posted: Mon May 16, 2005 6:25 pm    Post subject: Re: memory stream parsing Quote: Not to discount your code, but isn't this a little simpler: Yes, I know for StringReplace(), that's what I mainly use in simple cases. But I never knew about AnsiString capacities so I tried with Streams directly. -- Best regards, Vladimir Stefanovic Back to top Remy Lebeau (TeamB) Guest Posted: Mon May 16, 2005 6:27 pm    Post subject: Re: memory stream parsing "Jonathan Benedicto" <incorrect (AT) no (DOT) server> wrote Quote: Not to discount your code, but isn't this a little simpler: Simplier perhaps, but much less efficient since you are now copying the data around 4 times. Gambit Back to top Jonathan Benedicto Guest Posted: Mon May 16, 2005 6:27 pm    Post subject: Re: memory stream parsing "Vladimir Stefanovic" <antivari (AT) po (DOT) sbb.co.yu> wrote Quote: Yes, I know for StringReplace(), that's what I mainly use in simple cases. But I never knew about AnsiString capacities so I tried with Streams directly. I thought that AnsiStrings worked off the heap, and therefore were well able to take huge strings. So, I always used them for things like this. Jonathan Back to top Jonathan Benedicto Guest Posted: Mon May 16, 2005 6:30 pm    Post subject: Re: memory stream parsing "Remy Lebeau (TeamB)" <no.spam (AT) no (DOT) spam.com> wrote Quote: Simplier perhaps, but much less efficient since you are now copying the data around 4 times. I didn't think of that. Thank you for enlightening me. 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