当我们使用此文本“ali ata bak”创建文本文件时,我们将此文件用作程序的输入。代码正常运行。但是当我们在文本文件中输入“1111111111111111111111”这个文本时,Code没有运行预期。那么问题是什么?
#include <QtCore/QCoreApplication>
#include <QBitArray>
#include <QByteRef>
#include <QFile>
#include <iostream>
#include <stdlib.h>
#include <QTextStream>
// Buffer Size #num of KB's
#define BUFFER_SIZE_KB 1
// Do not change !!
#define BUFFER_SIZE_BYTE BUFFER_SIZE_KB*1024
#define BUFFER_SIZE_BIT BUFFER_SIZE_BYTE*8
using namespace std;
QBitArray bytesToBits(QByteArray bytes) {
QBitArray bits(bytes.count()*8);
// Convert from QByteArray to QBitArray
for(int i=0; i<bytes.count(); ++i)
for(int b=0; b<8; ++b)
bits.setBit(i*8+b, bytes.at(i)&(1<<b));
return bits;
}
QByteArray bitsToBytes(QBitArray bits) {
QByteArray bytes;
bytes.resize(bits.count()/8);
// Convert from QBitArray to QByteArray
for(int b=0; b<bits.count(); ++b)
bytes[b/8] = ( bytes.at(b/8) | ((bits[b]?1:0)<<(b%8)));
return bytes;
}
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
QString inFilename;
QString outFilename;
QTextStream qtin(stdin);
cout << "Filename : ";
qtin >> inFilename;
outFilename.append("_");
outFilename.append(inFilename);
QFile infile(inFilename);
if (!infile.open(QIODevice::ReadOnly)) {
cout << "\nFile cant opened\n";
system("pause");
return 1;
}
QFile outfile(outFilename);
if (!outfile.open(QIODevice::WriteOnly)) {
cout << "\nFile cant opened\n";
system("pause");
return 2;
}
QByteArray bytes, bytes2;
QBitArray bits;
while ((bytes = infile.read(BUFFER_SIZE_BYTE)) >0 ) {
bits = bytesToBits(bytes);
bytes2 = bitsToBytes(bits);// PROBLEM IS HERE
outfile.write(bytes2);
}
outfile.close();
infile.close();
cout << "Finished\n";
return a.exec();
}
答案 0 :(得分:7)
初始化问题。
QByteArray bitsToBytes(QBitArray bits) {
QByteArray bytes;
bytes.resize(bits.count()/8+1);
bytes.fill(0);
// Convert from QBitArray to QByteArray
for(int b=0; b<bits.count(); ++b)
bytes[b/8] = ( bytes.at(b/8) | ((bits[b]?1:0)<<(b%8)));
return bytes;
}
这会产生正确的答案
答案 1 :(得分:0)
您可能还想阅读维基百科http://en.wikipedia.org/wiki/Endianness
中的字节顺序答案 2 :(得分:0)
QByteArray bitsToBytes(const QBitArray& bits)
{
QByteArray bytes;
QDataStream stream(&bytes, QIODevice::WriteOnly);
stream << bits;
return bytes;
}
答案 3 :(得分:0)
QBitArray bits(8);
// The deep copy of bits
QByteArray bytes(bits.bits(), bits.count() / 8);
--------------------------------------------------------------------------
// The bits are not copied
QByteArray bytes = QByteArray::fromRawData(bits.bits(), bits.count() / 8);