qt ymodem的代码
时间: 2024-01-09 12:04:51 浏览: 28
以下是使用Qt实现YModem协议的示例代码:
```cpp
#include "ymodem.h"
const int PACKET_SIZE = 128;
const int FILE_NAME_SIZE = 128;
YModem::YModem(QIODevice *device, QObject *parent)
: QObject(parent)
, m_device(device)
{
}
bool YModem::sendFile(const QString &filePath)
{
QFile file(filePath);
if (!file.open(QIODevice::ReadOnly)) {
emit error(tr("Failed to open file: %1").arg(file.errorString()));
return false;
}
QByteArray fileName = QFileInfo(file).fileName().toLatin1();
if (fileName.size() > FILE_NAME_SIZE) {
emit error(tr("File name is too long"));
return false;
}
quint32 fileSize = file.size();
quint32 packetCount = fileSize / PACKET_SIZE + ((fileSize % PACKET_SIZE) ? 1 : 0);
// Send the first packet (filename and file size)
char firstPacket[PACKET_SIZE + 3] = { 0 };
firstPacket[0] = SOH;
firstPacket[1] = 0;
firstPacket[2] = 0xFF;
qstrncpy(firstPacket + 3, fileName.data(), qMin(fileName.size(), FILE_NAME_SIZE));
qToBigEndian<quint32>(fileSize, firstPacket + FILE_NAME_SIZE + 3);
if (!sendPacket(firstPacket, sizeof(firstPacket))) {
return false;
}
// Send the file data packets
for (quint32 packetNum = 0; packetNum < packetCount; ++packetNum) {
QByteArray packetData = file.read(PACKET_SIZE);
if (packetData.size() < PACKET_SIZE) {
packetData.resize(PACKET_SIZE);
}
char packet[PACKET_SIZE + 3] = { 0 };
packet[0] = STX;
packet[1] = (packetNum & 0xFF);
packet[2] = (~packetNum & 0xFF);
memcpy(packet + 3, packetData.constData(), PACKET_SIZE);
if (!sendPacket(packet, sizeof(packet))) {
return false;
}
emit progress((packetNum + 1) * 100 / packetCount);
}
// Send the end-of-transmission packet
char eotPacket[PACKET_SIZE + 3] = { 0 };
eotPacket[0] = EOT;
if (!sendPacket(eotPacket, sizeof(eotPacket))) {
return false;
}
return true;
}
bool YModem::sendPacket(const char *data, int size)
{
m_device->write(data, size);
char response = 0;
if (!waitForAck(&response)) {
return false;
}
return true;
}
bool YModem::waitForAck(char *ack)
{
char data = 0;
while (m_device->getChar(&data)) {
switch (data) {
case ACK:
case NAK:
*ack = data;
return true;
case CAN:
emit error(tr("Transfer was cancelled by remote end"));
return false;
}
}
emit error(tr("Timeout waiting for response from remote end"));
return false;
}
```
在此示例中,我们使用了Qt提供的QIODevice类作为数据源,并发送了一个文件。该类定义了YModem协议中使用的常量(如数据包大小,文件名长度等),以及发送文件和发送数据包的函数。注意,此示例仅支持发送文件,而不支持接收文件。
请注意,在实现YModem协议时,您需要处理许多不同的状态和错误情况。这个简单的示例代码可能无法满足所有要求。
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