[C++] Convertire un buffer ReadFile()

**DennisM** · 09-07-2010, 20:05

Ciao ragazzi!

Oggi ho bisogno di aiuto. come mi posso convertire un (char *)buffer da ReadFile cosi lo output mi posso inviare ad un Dialog del WinAPI?

Grazie a mille!
Dennis M.

**oregon** · 09-07-2010, 20:07

Non ci ho capito nulla ... ma che hai detto?

P.S. Devi anche indicare il linguaggio nel titolo ... vedi regolamento.

**DennisM** · 09-07-2010, 20:29

beh mi usare il funziona ReadFile di Windows.

codice:

BOOL WINAPI ReadFile(
  __in         HANDLE hFile,
  __out        LPVOID lpBuffer,
  __in         DWORD nNumberOfBytesToRead,
  __out_opt    LPDWORD lpNumberOfBytesRead,
  __inout_opt  LPOVERLAPPED lpOverlapped
);

l'ho letto informazione da un pipe. cmq mi vorrei per inviare che output (solo il testo) ad un HWND (CreateWindowEx(0,"edit ...)). mi posso inviare l'informazione ad il Dialog senza ogni problema ma anche si invia più di solo testo.

Mi spiego

Vorrei:

codice:

some output...'Hola Mondo' means...

Hello word!

Ma l'ho

codice:

some output...'Hola Mondo' means...

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Ciao
Dennis M.

**shodan** · 09-07-2010, 23:04

ReadFile restituisce il numero di caratteri letti in lpNumberOfBytesRead.
Devi usare quel valore per mettere il NULL alla stringa.

codice:

char buffer[256];
DWORD bytesRead=0;
ReadFile(hfile, buffer, 256, &bytesRead,NULL);
buffer[bytesRead] = NULL;

**oregon** · 09-07-2010, 23:06

Concordo con shodan ...

P.S. I traduttori automatici NON funzionano ...

**DennisM** · 09-07-2010, 23:33

non uso un traddutore XD il mio italiano è solo male :P

capisco ma non è il mio problema.

vedi

codice:

	DWORD dwRead;
	char chBuf[BUFSIZE], currentBuf[BUFSIZE];
	int textlen;
	BOOL bSuccess = FALSE;
	HWND cText;

		cText  = ::GetDlgItem(global,IDO_WORLDOUT);
		textlen = ::GetWindowTextLengthA(cText);
		::GetDlgItemTextA(global,IDO_WORLDOUT,currentBuf,textlen+1);

		::ReadFile(_hChild_Out_Rd, chBuf, BUFSIZE, &dwRead, NULL);

		strcat(currentBuf, chBuf);
		::SetDlgItemTextA(global,IDO_WORLDOUT,currentBuf);

Ciao
Dennis M.

**MItaly** · 10-07-2010, 00:00

Il problema è proprio quello, invece; se la stringa che leggi non è NUL-terminata, devi aggiungere tu il NUL finale; basta inserire, subito dopo la ReadFile

codice:

chBuf[dwRead-1]=0;

Tra parentesi, la chiamata a GetDlgItemTextA non dovrebbe specificare textlen+1, ma BUFSIZE, dato che il buffer che usi è grande BUFSIZE, non textlen. Se per caso textlen fosse più grande di BUFSIZE con il tuo codice ti ritroveresti con un buffer overflow, mentre con il codice corretto avresti una stringa troncata.
In realtà l'approccio migliore se vuoi andare sul sicuro sarebbe allocare dinamicamente la memoria necessaria per la stringa.

Originariamente inviato da DennisM
non uso un traddutore XD il mio italiano è solo male :P

Un suggerimento al volo: nella maggior parte dei casi (questo in particolare) "bad" si traduce come "cattivo", non come "male".

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