C# 操作并口类,并口通信
c#已提供了串口通信组件SerialPort,但是C#并没有提供直接的并口通信组件,只好通过调用API来与并口通信
代码
1
using
System;
2
using
System.Runtime.InteropServices;
3
namespace
LptPrint_test
4
{
5
///
<summary>
6
///
LPTControl 的摘要说明。
7
///
</summary>
8
public
class
LPTControl
9
{
10
private
string
LptStr
=
"
lpt1
"
;
11
public
LPTControl(
string
l_LPT_Str)
12
{
13
//
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//
TODO: 在此处添加构造函数逻辑
15
//
16
LptStr
=
l_LPT_Str;
17
}
18
[StructLayout(LayoutKind.Sequential)]
19
private
struct
OVERLAPPED
20
{
21
int
Internal;
22
int
InternalHigh;
23
int
Offset;
24
int
OffSetHigh;
25
int
hEvent;
26
}
27
[DllImport(
"
kernel32.dll
"
)]
28
private
static
extern
int
CreateFile(
string
lpFileName,
uint
dwDesiredAccess,
int
dwShareMode,
int
lpSecurityAttributes,
int
dwCreationDisposition,
int
dwFlagsAndAttributes,
int
hTemplateFile);
29
[DllImport(
"
kernel32.dll
"
)]
30
private
static
extern
bool
WriteFile(
int
hFile,
byte
[] lpBuffer,
int
nNumberOfBytesToWrite,
ref
int
lpNumberOfBytesWritten,
ref
OVERLAPPED lpOverlapped);
31
[DllImport(
"
kernel32.dll
"
)]
32
private
static
extern
bool
CloseHandle(
int
hObject);
33
private
int
iHandle;
34
public
bool
Open()
35
{
36
iHandle
=
CreateFile(LptStr,
0x40000000
,
0
,
0
,
3
,
0
,
0
);
37
if
(iHandle
!=
-
1
)
38
{
39
return
true
;
40
}
41
else
42
{
43
return
false
;
44
}
45
}
46
public
bool
Write(String Mystring)
47
{
48
if
(iHandle
!=
-
1
)
49
{
50
OVERLAPPED x
=
new
OVERLAPPED();
51
int
i
=
0
;
52
byte
[] mybyte
=
System.Text.Encoding.Default.GetBytes(Mystring);
53
bool
b
=
WriteFile(iHandle, mybyte, mybyte.Length,
ref
i,
ref
x);
54
return
b;
55
}
56
else
57
{
58
throw
new
Exception(
"
不能连接到打印机!
"
);
59
}
60
}
61
public
bool
Write(
byte
[] mybyte)
62
{
63
if
(iHandle
!=
-
1
)
64
{
65
OVERLAPPED x
=
new
OVERLAPPED();
66
int
i
=
0
;
67
WriteFile(iHandle, mybyte, mybyte.Length,
ref
i,
ref
x);
68
return
true
;
69
}
70
else
71
{
72
throw
new
Exception(
"
不能连接到打印机!
"
);
73
}
74
}
75
public
bool
Close()
76
{
77
return
CloseHandle(iHandle);
78
}
79
}
80
}
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