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自己动手编写
串口动态库
手把手教你编写串口调试助手，单片机串口程序
一、串口库源码
:
自行在
vc6
中建立动态库工程
#include
#include
#include
#include
#include
#include
< br>/*
导出函数
*/
//
函数参数：串口名
:
波特率：
9600
用于显示接收数据的文本框的句柄
extern
_declspec
(
dllexport
)
void
Entry(
char
*comname,
int
BaudRate, HWND rhbox);
extern
_declspec
(
dllexport
)
bool
openport(
char
*portname);
extern
_declspec
(
dllexport
)
bool
setupdcb(
int
rate_arg);
extern
_declspec
(
dllexport
)
void
SetTimeOut(
int
a,
int
b,
int
c,
int
d,
int
e);
//
发送字符或
16
进制数
extern
_declspec
(
dllexport
)
void
SendChar(
unsigned
char
ch);
//
显示方式：
1
：
hex
0
：
char
extern
_declspec
(
dllexport
)
void
DisplayHex(
int
flag);
extern
_declspec
(
dllexport
)
void
Close();
//
只使用上面有注释的三个函数即可
HANDLE
hComm;
//
串口的句柄
OVERLAPPED m_ov;
//
是一个包含了用于异步输入输出的信息的结构体
COMSTAT comstat;
//
包含串口结构信息
HANDLE hThread1;
//
读线程句柄
HANDLE hThread2;
//
写线程句柄
HWND hRbox;
bool
sendflag =
false
;
unsigned
char
sendchar, receivechar;
bool
DisplayHEX =
false
;
ProcessErr
orMessage(
char
* ErrorText)
//
打印进程错误信息
{
}
/*************
***
打开串口
*********************
/
bool
openport(
char
*portname)
{
char
*Temp =
new
char
[200];
LPVOID
lpMsgBuf;
FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM,
NULL,
GetLastError(),
MAKELANGID(LANG_NEUTRAL,
SUBLANG_DEFAULT),
// Default language
(LPTSTR)&lpMsgBuf,
0,
NULL
);
sprintf(Temp,
,
MessageBox(NULL, Temp,
, MB_ICONSTOP);
LocalFree(lpMsgBuf);
delete
[] Temp;
return
true
;
(
char
*)ErrorText,
lpMsgBuf,
);
}
hComm = CreateFile(portname,
GENERIC_READ | GENERIC_WRITE,
0,
0,
OPEN_EXISTING,
FILE_FLAG_OVERLAPPED,
0);
return
FALSE;
return
true
;
if
(hComm ==
INVALID_HANDLE_VALUE)
else
<
/p>
/****************
设备控制块的设置
*********************/
//
参数
波
特率
rate_arg
：
9600
bool
setupdcb(
int
rate_arg)
{
DCB dcb;
int
rate = rate_arg;
memset(&dcb, 0,
sizeof
(dcb));
//
申请一个
DCB
结构体空
间
if
(!GetCommState(hComm, &dcb))
//
获取当前
DCB
配置
{
}
/* ------------------------------------
-------------------------------- */
//
配置当前串口
gth =
sizeof
(dcb);
/*
----------
串口的配置
-------
*/
te = rate;
=
NOPARITY;
y = 0;
ts =
ONESTOPBIT;
ze = 8;
tsFlow =
0;
srFlow = 0;
ntrol =
DTR_CONTROL_DISABLE;
nsitivity = 0;
ntrol = RTS_CONTROL_DISABLE;
= 0;
= 0;
/*
------
其他参数的设置
-----
*/
Char = 0;
y =
1;
= 0;
ProcessErrorMessage
(
);
//
打
印错误信息
return
FALSE;
}
OnError = 0;
ved = 0;
= 2;
m = 4;
r =
0x13;
ar = 0x19;
r = 0;
/* ------------------------------------
-------------------------------- */
//
用上面的设备控制块来设置当前串口
if
(!SetCommState(hComm,
&dcb))
{
}
else
return
true
;
//
设置成功
ProcessErrorMessage(
);
return
false
;
/*********
**********
超时的设置
*************
**************/
bool
setuptimeout(
int
ReadInterval,
int
ReadTotalMultiplier,
int
ReadTotalconstant,
int
WriteTotalMultiplier,
int
WriteTotalconstant)
{
}
void
ReceiveChar()
{
BOOL bRead = TRUE;
BOOL
bResult = TRUE;
DWORD dwError = 0;
DWORD BytesRead = 0;
char
RXBuff;
//
接收数据缓冲器
char
str[10];
COMMTIMEOUTS timeouts;
tervalTimeout = ReadInterval;
//
读间隔超时
talTimeoutConstant =
ReadTotalconstant;
//
读时间常量
talTimeoutMultiplier =
ReadTotalMultiplier;
//
读时间系数
otalTimeoutConstant =
WriteTotalconstant;
//
写时间常量
otalTimeoutMultiplier =
WriteTotalMultiplier;
//
写时间系数
if
(!SetCommTimeouts(hComm,
&timeouts))
{
}
else
return
true
;
ProcessErro
rMessage(
);
return
false
;
//
设置当前串口的超时设置
for
(;;)
//
死循环等待
{
Sleep(100);
bResult = ClearCommError(hComm,
&dwError, &comstat);
//
清除硬件的通
讯错误以及
if
(e == 0)
{
bResult = ReadFile(hComm,
// Handle to COMM port
}
else
{
}
//
printf(
打印接收到的数据
sprintf(str,
,
RXBuff);
SetWindowText(hRbox, str);
&RXBuff,
1,
// RX Buffer
Pointer
// Read one
byte
continue
;
if
(bRead)
获取通讯设备的当前状态
&BytesRead,
//
Stores number of bytes read
&m_ov);
// pointer to the m_ov
structure
if
(DisplayHEX){
//
printf(
打印接收到的数据
sprintf(str,
,
RXBuff);
SetWindowText(hRbox, str);
if
(!bResult)
//
读不成功
{
}
else
{
bRead = TRUE;
switch
(dwError =
GetLastError())
{
case
ERROR_IO_PENDING:
{
}
default
:
{
}
}
break
;
bRead = FALSE;
break
;
}
}
}
}
// close if
(bRead)
if
(!bRead)
{
}
bRead = TRUE;
bResult =
GetOverlappedResult(hComm,
// Handle
to COMM port
&m_ov,
//
Overlapped structure
&BytesRead,
// Stores
number of bytes read
TRUE);
// Wait flag
WriteChar(BYTE* m_szWriteBuffer, DWORD
m_nToSend)
{
BOOL bWrite = TRUE;
BOOL
bResult = TRUE;
DWORD BytesSent = 0;
HANDLE m_hWriteEvent;
ResetEvent(m_hWriteEvent);
if
(bWrite)
{
m_
= 0;
m_High = 0;
// Clear
buffer
bResult =
WriteFile(hComm,
// Handle
to COMM Port
{
DWORD dwError = GetLastError();
switch
(dwError)
{
case
ERROR_IO_PENDING:
{
}
default
:
{
// all other error codes
// continue to
GetOverlappedResults()
BytesSent = 0;
bWrite = FALSE;
break
;
m_szWriteBuffer,
// Pointer
to message buffer in calling finction
m_nToSend,
// Length of message to send
&BytesSent,
//
Where to store the number of bytes sent
&m_ov);
// Overlapped structure
if
(!bResult)
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