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#define _CRT_SECURE_NO_WARNINGS
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#include
4 Y" M3 _) F3 D- f#include "tchar.h"
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#include
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int mAIn()- b* R' t0 D8 `5 V/ z" `+ a
{
+ D. F+ C5 r9 o9 E/ v% {2 c HANDLE hCom1;
% j6 m% g1 D& [: {! J+ x COMMtiMEOUTS TimeOuts; 4 e/ `3 b6 d: b6 K: m: z
DCB dcb1;; t+ r2 k3 A0 ^, q ?
DWORD i ;5 c( J( M+ h' M
DWORD wCount =4;3 S" L, `- X& C7 h# }2 u
DWORD wCount1;8 x9 a3 s1 A3 C8 X% R3 j9 c& W, O
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5 Z1 W2 _3 r% o3 _ unsigned char str[8];7 w' X& _( ~$ m5 K/ D* _" M- C
8 h3 {8 W# j, x) J! E/ p3 h hCom1 = CreateFile("COM4",
- q1 {7 C# W4 w& r2 v2 u GENERIC_READ | GENERIC_WRITE,& \$ d: f7 e' A/ U; U" J6 w+ | C
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NULL,2 H/ O1 K! ]- ~3 V
OPEN_EXISTING,6 f/ V+ j4 c& \0 q# r0 j, _
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NULL);
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2 p$ x$ @6 Q0 z) E9 q) p if (hCom1==INVALID_HANDLE_VALUE )
9 _4 R1 h/ t9 p: S' | {
' T! I* J4 A" }+ N$ {' Q- ^9 e printf("read open failed\n");
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else
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printf("read open successed\n");
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SetupComm(hCom1, 20480, 20480);
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0 }. { t# F+ J4 o3 A //COMMTIMEOUTS TimeOuts;
) A7 f( y$ j$ b$ ]; R3 u8 [ TimeOuts.ReadIntervalTimeout =100;
8 f, W0 Y: m$ o/ O; t' o; R TimeOuts.ReadTotalTimeoutMultiplier =500;
+ _) K; m, B! {2 L TimeOuts.ReadTotalTimeoutConstant = 5000; 5 C, f( h! ~; e0 t" t: a
TimeOuts.WriteTotalTimeoutMultiplier = 500;
G2 H, k, j0 ^" T3 G& T8 c TimeOuts.WriteTotalTimeoutConstant = 2000;
$ {+ G! Q. ~) R w$ D8 P, Q SetCommTimeouts(hCom1, &TimeOuts);
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, J1 l" l: i1 _$ n9 G, z" [ //DCB dcb1;7 V' j) @& N$ y2 s- G# @
GetCommState(hCom1, &dcb1);9 l( b+ o. ^+ c( w' S' f/ t3 N" P
dcb1.BaudRate = 115200;
. R) b/ p5 a; s0 f: K$ }! H3 F4 M dcb1.ByteSize = 8;//一个字节8bit1 ]" A+ f% o( Z; f
dcb1.Parity = NOPARITY;//无校验2 B9 Y# B' D3 n: W1 r( C
dcb1.StopBits = ONESTOPBIT;//1位停止位
) ^; Y6 N- a u% ^! D dcb1.fParity = FALSE;
* b* x `, H+ o3 M dcb1.fNull = FALSE;
9 }& d# L* k' ` SetCommState(hCom1, &dcb1);
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PurgeComm(hCom1, PURGE_TXCLEAR|PURGE_RXCLEAR);$ V/ `0 X5 \) c3 @0 g5 M5 M6 \
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if(!ReadFile(hCom1, str, wCount, &wCount1, NULL)). K% X; t& L) v
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printf("read failed!");
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else$ _3 V- Y8 J+ C5 J+ M$ W
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printf("read successed!");
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printf("wCount1:%d\n", wCount1);' o- w! O- o, ?- J4 Q: ?7 Q. ]
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0 d9 J4 c {; }4 j5 h$ g% I y printf("read data is");9 Q- G2 [7 K" @7 o
for(i=0;i {4 C/ i- A b- m
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printf("%02X", str);" ~9 u( O4 ~# [0 J4 N7 t. e) e
}
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% z& Z4 F2 m5 R1 ?; p& g5 wCloseHandle(hCom1);% _5 }* b3 g' n& \4 b. P3 o
& y% K1 P! x0 d0 w' p// system("pause");
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, O" J6 a2 l! k+ n7 i代码贴上来了,wCount1总是为0,不知道哪里出了问题,有没有大佬帮忙看下,感谢。
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