Цитата(ViGOur @ 25.3.2010, 20:14)

    nbytes = write( fd, &n, sizeof( int ) );
    if( nbytes < 0 ) {
        fprintf( stderr, "Write: error writing to %d(fd) %d(int)\n", fd, n );
        return -1;
    }

    nbytes = write( fd, data, sizeof( char ) * n );
    if( nbytes < 0 ) {
        fprintf( stderr, "Write: error writing to %d(fd) %s(data)\n", fd, data );
        return -2;
    }

QTcpSocket socket;
QByteArray array;
array = socet.readAll();
qDebug() << "READ:" << array.toHex().toUpper();

Цитата(Litkevich Yuriy @ 26.3.2010, 23:50)

QTcpSocket socket;
QByteArray array;
array = socet.readAll();
qDebug() << "READ:" << array.toHex().toUpper();

void CClientGui::slotReadyRead() {
    int err;
    int size = 0;
    char *buf = NULL;
    int percent;
    int idTask;
    static bool flagFirst = true;

    QDomDocument loc_xmlDoc;
    QDomElement loc_xmlRootElement;

    int bytes = CClientGui::tcpSocket.bytesAvailable();
    fprintf( stdout, "available %d bytes\n", (int)bytes );
    /*
     * First message structure :
     * <answer>
     *        <id>#id</id>
     * </answer>
     */  
    if( flagFirst == true ) {        
        responseArr.append( CClientGui::tcpSocket.readAll() );
        err = readFromServer( responseArr, size, &buf );
        if( err != 0 ) {
            fprintf( stderr, "Error read from socket" );
            return;
        }
//....

int CClientGui::readFromServer( QByteArray &bufAll, int& _size, char **_buf ) {
    char *buf = NULL;
    int size;

    fprintf( stdout, "allBuf: %s\n", bufAll.data() );
    fprintf( stdout, "allBuf hex: %s\n", bufAll.toHex().data() ); // добавил вывод в 16-ричной форме

    buf = new char[sizeof(int)];
    buf = bufAll.left( sizeof( int ) ).data(); // здесь должно быть чтение байт (никакого преобразования к qint64 и тому подобным)
    fprintf( stdout, "input read: %s\n", buf );
    _size += sizeof( int );
    sscanf( buf, "%d", &size );
    fprintf( stdout, "to read: %d bytes\n", size );
    bufAll.remove(0,sizeof(int));
    buf = new char[size+1];
    strcpy( buf, bufAll.right( size ).data() );
    buf[size] = '\0';
    *_buf = buf;
    buf = NULL;
    bufAll.remove( 0, size );
    _size += size;

    return 0;
}

qint64 nRet=CClientGui::tcpSocket.read( &n, sizeof(int));