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#define _CRT_SECURE_NO_WARNINGS& q& \9 F" D6 d0 @
#include
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#include "tchar.h"
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#include7 p1 l3 g4 l; |; D" w
#include
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% T2 }: S. y) b g2 |' b; M: ?- Wint mAIn() _, v8 A9 \3 q8 [7 f+ M; j4 _
{
8 ]6 D0 I+ k% r8 {8 B HANDLE hCom1;; ~/ i! X0 p! p/ \
COMMtiMEOUTS TimeOuts; 6 M4 ^( }/ L* r- w
DCB dcb1;
! Z" T w, w! k9 b2 |& T DWORD i ;
' ~4 A- E0 Y5 e8 V+ A, S3 C DWORD wCount =4;# Q* q$ e# x) `: J; f! ]$ e. ^
DWORD wCount1;
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unsigned char str[8];
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( ]6 _( K1 ?: d& O& E, Y hCom1 = CreateFile("COM4",* H2 }& C. P A) V( Z; z
GENERIC_READ | GENERIC_WRITE,
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OPEN_EXISTING,0 L( k( g! L0 m1 }6 y! b8 z9 W
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NULL);+ C! D e% X5 Q5 c' r3 O
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1 D1 y7 k5 j& e% y if (hCom1==INVALID_HANDLE_VALUE )
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printf("read open failed\n");
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else* G7 ^2 l2 t: B
{
1 i: W9 q- L, _ ?1 j1 Y! Z* W! ^ printf("read open successed\n");
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SetupComm(hCom1, 20480, 20480);9 {% \( j" j" X2 q/ H! K0 }" @3 i% ?
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//COMMTIMEOUTS TimeOuts;
: P5 g, v6 o1 n" e; Y! c( T TimeOuts.ReadIntervalTimeout =100;
- Y; L) n; x( Y' |( F TimeOuts.ReadTotalTimeoutMultiplier =500;" J, Z6 V* y8 z" l! g+ E3 M! ]9 a
TimeOuts.ReadTotalTimeoutConstant = 5000;
3 N7 x* Q6 g8 @5 \. H TimeOuts.WriteTotalTimeoutMultiplier = 500;' ^) r5 v' W' X
TimeOuts.WriteTotalTimeoutConstant = 2000;. c6 g, r8 G: _" ^
SetCommTimeouts(hCom1, &TimeOuts);
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1 G6 T" s3 X& ~, P) i: h; c) Q# K* f //DCB dcb1;6 O: Q& m9 A; }. e$ v
GetCommState(hCom1, &dcb1);
" |4 z) D* b0 s dcb1.BaudRate = 115200;8 z% k# V6 p7 N+ ~+ i8 {1 J; C+ m
dcb1.ByteSize = 8;//一个字节8bit# f! N3 ?0 w- H$ }, w8 s1 `- _4 H
dcb1.Parity = NOPARITY;//无校验
( s' x+ Y5 |; S0 U3 V; k+ U dcb1.StopBits = ONESTOPBIT;//1位停止位
% `+ R( j3 s; o& l [ dcb1.fParity = FALSE;
( A+ m5 M4 k* D6 N2 M( D dcb1.fNull = FALSE;. J2 e4 T# Q+ h6 a# ~: m$ q
SetCommState(hCom1, &dcb1);
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PurgeComm(hCom1, PURGE_TXCLEAR|PURGE_RXCLEAR);
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! f3 }# }3 N) b, N0 d if(!ReadFile(hCom1, str, wCount, &wCount1, NULL))
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& F! H% Z/ u& y printf("read failed!");) A- \1 }: F# X) u* t' p# H' p2 b
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printf("read successed!");
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printf("wCount1:%d\n", wCount1);6 V- |5 F3 A# P4 @4 H4 s5 I+ [; b S8 c
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printf("read data is");
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printf("%02X", str); l2 A$ s1 l" D/ j% U2 k4 Y! r& Q7 z
}
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" W: K3 f) ?) p' x. p( V; XCloseHandle(hCom1);
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8 H$ C; o( J$ O" P, C4 P// system("pause");, h! _4 v- e$ B- }
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}
3 {6 s, H- V) }' m( l' ]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。( `# j4 [8 u5 K5 y
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