Need help. can't append chars in QString

Hi everyone!,

I trying to append chars readed from http response which is writen with wininit module into QString. but the QString is stays 0 byte length.
I can't use QHttp class, because it has problem with POST request under wince.
http://trolltech.com/developer/task-...5&method=entry

here is sample of code:

Code:

---

QString str;
   char szBuffer[4096];
   DWORD dwNumberOfBytesRead = 0;
   while ( InternetReadFile(hResourceHandle, szBuffer, sizeof(szBuffer),
                            &dwNumberOfBytesRead) &&
                            dwNumberOfBytesRead )
   {
     str.append(szBuffer);
 
   }
 
qDebug() << str;

---

qDebug prints nothing and str.length() == 0, but dwNumberOfBytesRead > 0 :(

Thanks for any help!

Quote:

---

Originally Posted by AcerExtensa

Code:

---

QString str;
   char szBuffer[4096];
   DWORD dwNumberOfBytesRead = 0;
   while ( InternetReadFile(hResourceHandle, szBuffer, sizeof(szBuffer),
                            &dwNumberOfBytesRead) &&
                            dwNumberOfBytesRead )
   {
     str.append(szBuffer);
 
   }
 
qDebug() << str;

---

---

You are not using append correctly. QString's append receives "char*" as a paramete,r but not "char".

Compiler says

Quote:

---

Converting Parameter 1 from char (*)[256] in QChar inpossible

---

i can read data by copying each char into string:

Code:

---

for(int i= 0; i<= dwNumberOfBytesRead; i++){
		str += QString(szBuffer[i]);
}

---

but it is not good solution...... :(

Quote:

---

Originally Posted by AcerExtensa

I trying to append chars readed from http response which is writen with wininit module into QString. but the QString is stays 0 byte length.

---

Weird. Maybe the buffer begins with '\0'? What does "qDebug() << QByteArray( szBuffer, dwNumberOfBytesRead )" output?

And you shouldn't disregard dwNumberOfBytesRead, unless you like random crashes.

Quote:

---

Originally Posted by lyuts

You are not using append correctly. QString's append receives "char*" as a paramete,r but not "char".

---

But szBuffer is a char *.

Here what I get with qDebug:

Quote:

---

"y></SOAP-ENV:Envelope>
"

---

and here is original response copyed from Wireshark:

Quote:

---

<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="urn:crmlogon" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"><SOAP-ENV:Body><ns1:crmLoginResponse><return xsi:type="xsd:string">dsfsdfdfsdfsdfdsfsdfdsf</return></ns1:crmLoginResponse></SOAP-ENV:Body></SOAP-ENV:Envelope>

---

here is the code:

Code:

---

DWORD code = sizeof (DWORD), dwBytesWritten = sizeof (code);
::HttpQueryInfo(hResourceHandle, HTTP_QUERY_STATUS_CODE | HTTP_QUERY_FLAG_NUMBER, &code, &dwBytesWritten, NULL);
qDebug() << "status code:" << code;
DWORD baval = sizeof(DWORD);
::InternetQueryDataAvailable(hResourceHandle, &baval, NULL, NULL);
qDebug() << "Bytes Available:" << baval;
 
   char szBuffer[256];
   DWORD dwNumberOfBytesRead = 1;
	while(dwNumberOfBytesRead){
		if(::InternetReadFile(hResourceHandle, szBuffer, sizeof(szBuffer),&dwNumberOfBytesRead)){
			if(dwNumberOfBytesRead == 0) break;
			//qDebug() << QByteArray( szBuffer, dwNumberOfBytesRead );
	//szBuffer[dwNumberOfBytesRead] = 0;
 
 
	qDebug() << "BytesRead" << dwNumberOfBytesRead;
	str.append(szBuffer);
	/*
	for(int i= 0; i<= (int)dwNumberOfBytesRead; i++){
		str += QString(szBuffer[i]);
		}*/
	qDebug() << "current str.length()" << str.length();
			}
		else{ qDebug() << "error:" << GetLastError(); }
		}
 
 
	QFile *file = new QFile("log");
	file->open(QIODevice::WriteOnly);
	QByteArray bbb;
	bbb.append(str);
	file->write(bbb);
	file->close();
 
	}
	else{
		qDebug() << "dwErrorCode" << GetLastError();
		}
qDebug() << "complete response" << str;
qDebug() << "length" << str.length();

---

debug output:

Quote:

---

status code: 200
Bytes Available: 535
BytesRead 256
current str.length() 258
BytesRead 256
current str.length() 516
BytesRead 23
current str.length() 774
length 774

---

data in file:

Quote:

---

<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="urn:crmlogon" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAP-ENC=Hµݢhttp://schemas.xmlsoap.org/soap/encoding/" SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"><SOAP-ENV:Body><ns1:crmLoginResponse><return xsi:type="xsd:string">93b262066b4ec01dcafd26f7fb26 f53e</return></ns1:crmLoginResponse></SOAP-ENV:BodH޹µ></SOAP-ENV:Envelope>
.org/soap/encoding/" SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"><SOAP-ENV:Body><ns1:crmLoginResponse><return xsi:type="xsd:string">93b262066b4ec01dcafd26f7fb26 f53e</return></ns1:crmLoginResponse></SOAP-ENV:BodH݀µ

---

µ - on place µ symbol is symbole like that [] filled with black color, don't know wtf is that :)

absolute same result if str is QByteArray.

any idea people?

Quote:

---

Originally Posted by AcerExtensa

Hi everyone!,

I trying to append chars readed from http response which is writen with wininit module into QString. but the QString is stays 0 byte length.
I can't use QHttp class, because it has problem with POST request under wince.
http://trolltech.com/developer/task-...5&method=entry

here is sample of code:

Code:

---

QString str;
   char szBuffer[4096];
   DWORD dwNumberOfBytesRead = 0;
   while ( InternetReadFile(hResourceHandle, szBuffer, sizeof(szBuffer),
                            &dwNumberOfBytesRead) &&
                            dwNumberOfBytesRead )
   {
     str.append(szBuffer);
 
   }
 
qDebug() << str;

---

qDebug prints nothing and str.length() == 0, but dwNumberOfBytesRead > 0 :(

Thanks for any help!

---

Problems that I see:

1) array of bytes char* is converted into QString without specifying encoding (which is UTF-8 in that case);
2) since length of data is not provided then char* is read untill first '\0'. In your case it looks like QString::append reads beyond bounds of buffer;
3) why do you need QString here? You are getting array of bytes so keep them into QByteArray;

Try this code:

Code:

---

QString str;
   QByteArray ba;
   char szBuffer[4096];
   DWORD dwNumberOfBytesRead = 0;
   while ( InternetReadFile(hResourceHandle, szBuffer, sizeof(szBuffer),
                            &dwNumberOfBytesRead) &&
                            dwNumberOfBytesRead )
   {
     QByteArray readData(szBuffer, dwNumberOfBytesRead);
     ba.append(readData);
   }
   str = QString::fromUtf8(ba.data(), ba.length());
 
qDebug() << str;

---

QByteArray is mutch better for me, I have just played with QBytes and QStrings.

Thanks! I get now data without any extra symbols, but qDebug don't print any, ba.length() prints 535 :)
ok, I don't really need to print this on screen or in console.... lets see if I can parse that data without problem....