C++获取COM1的串口句柄的代码
时间: 2024-03-13 08:43:48 浏览: 139
以下是获取COM1串口句柄的C++代码:
```cpp
#include <windows.h>
HANDLE hSerial = CreateFile("COM1", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (hSerial == INVALID_HANDLE_VALUE) {
// Handle error
}
```
其中,`CreateFile`函数用于打开COM1串口,并返回一个串口句柄`hSerial`。`GENERIC_READ`和`GENERIC_WRITE`参数分别表示该串口句柄可用于读和写操作。`INVALID_HANDLE_VALUE`表示打开串口失败。
相关问题
C++获取已经打开的串口句柄
在 Windows 操作系统中,打开串口后会返回一个串口句柄,可以通过这个句柄来进行读写操作。如果想要获取已经打开的串口句柄,可以使用 `CreateFile` 函数,该函数有一个 `dwShareMode` 参数,可以指定打开串口的方式,如果该参数为 `FILE_SHARE_READ | FILE_SHARE_WRITE`,则可以共享已经打开的串口句柄。
以下是一个获取已经打开的串口句柄的示例代码:
```cpp
#include <Windows.h>
#include <iostream>
int main()
{
// 打开串口
HANDLE hCom = CreateFile(L"COM1", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
if (hCom == INVALID_HANDLE_VALUE)
{
std::cout << "CreateFile failed!" << std::endl;
return -1;
}
// 获取已经打开的串口句柄
HANDLE hCom2 = CreateFile(L"COM1", GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);
if (hCom2 == INVALID_HANDLE_VALUE)
{
std::cout << "CreateFile failed!" << std::endl;
CloseHandle(hCom);
return -1;
}
std::cout << "hCom: " << hCom << std::endl;
std::cout << "hCom2: " << hCom2 << std::endl;
// 关闭串口句柄
CloseHandle(hCom);
CloseHandle(hCom2);
return 0;
}
```
在上面的示例代码中,我们先打开了 COM1 串口,并将其句柄保存在 `hCom` 变量中。然后,我们再次打开 COM1 串口,并使用 `FILE_SHARE_READ | FILE_SHARE_WRITE` 参数来共享已经打开的串口句柄,将其句柄保存在 `hCom2` 变量中。最后,我们输出两个句柄的值,并关闭它们。
用C++写一个串口的代码
#include <stdio.h>
#include <Windows.h>int main()
{
// 声明变量
HANDLE hComm;
BOOL Status;
DWORD dwEventMask;
char ComPortName[] = "COM1"; // 创建串口句柄
hComm = CreateFile( ComPortName,
GENERIC_READ | GENERIC_WRITE,
0,
0,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
0); // 设置串口的读写参数
DCB dcbSerialParams = {0};
dcbSerialParams.DCBlength=sizeof(dcbSerialParams);
Status=GetCommState(hComm, &dcbSerialParams); dcbSerialParams.BaudRate=CBR_9600;
dcbSerialParams.ByteSize=8;
dcbSerialParams.StopBits=ONESTOPBIT;
dcbSerialParams.Parity=NOPARITY;
SetCommState(hComm, &dcbSerialParams); // 设置超时时间
COMMTIMEOUTS timeouts={0};
timeouts.ReadIntervalTimeout=50;
timeouts.ReadTotalTimeoutConstant=50;
timeouts.ReadTotalTimeoutMultiplier=10;
timeouts.WriteTotalTimeoutConstant=50;
timeouts.WriteTotalTimeoutMultiplier=10;
SetCommTimeouts(hComm, &timeouts); // 设置串口事件
SetCommMask(hComm, EV_RXCHAR);
WaitCommEvent(hComm, &dwEventMask, NULL); // 关闭串口
CloseHandle(hComm); return 0;
}我用C语言写出了一个串口代码:#include <stdio.h>#include <Windows.h>int main() { // 声明变量HANDLE hComm;BOOL Status;DWORD dwEventMask;char ComPortName[] = "COM1"; // 创建串口句柄hComm = CreateFile(ComPortName, GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0); // 设置串口的读写参数DCB dcbSerialParams = {0};dcbSerialParams.DCBlength = sizeof(dcbSerialParams);Status = GetCommState(hComm, &dcbSerialParams);dcbSerialParams.BaudRate = CBR_9600;dcbSerialParams.ByteSize = 8;dcbSerialParams.StopBits = ONESTOPBIT;dcbSerialParams.Parity = NOPARITY;SetCommState(hComm, &dcbSerialParams); // 设置超时时间COMMTIMEOUTS timeouts = {0};timeouts.ReadIntervalTimeout = 50;timeouts.ReadTotalTimeoutConstant = 50;timeouts.ReadTotalTimeoutMultiplier = 10;timeouts.WriteTotalTimeoutConstant = 50;timeouts.WriteTotalTimeoutMultiplier = 10;SetCommTimeouts(hComm, &timeouts); // 设置串口事件SetCommMask(hComm, EV_RXCHAR);WaitCommEvent(hComm, &dwEventMask, NULL); // 关闭串口CloseHandle(hComm);return 0;}
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