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串口c程序接收数据长度总是为0& W( r! w& T( U) D
: i1 e d2 ~& t+ h. U9 d! y#define _CRT_SECURE_NO_WARNINGS
0 p* Z2 P5 v' B/ L N" A7 I8 X#include
0 Y0 l) l4 a+ [& a3 L#include
9 g5 |+ E3 [2 {# X8 y( l" e& w& H. |#include "tchar.h"8 f* P) n( J9 u s2 Q
7 z$ Q; p7 j7 R5 Y" K#include! }& p2 x6 @5 k
#include
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int mAIn() {& ~' V3 t( ~# f) ^) o3 _/ R4 [# w. y
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HANDLE hCom1;
- P6 E8 i* N+ N i COMMtiMEOUTS TimeOuts;
8 s0 \! y% a' Q! Q' _ DCB dcb1;
; ?, @* R8 U4 P/ U# O/ z DWORD i ;! ?' ^1 l% q3 d- F: g: M* b
DWORD wCount =4;! D/ ~2 ?! a5 ^6 I- _
DWORD wCount1;# G; q5 n1 B) a
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unsigned char str[8];+ `2 r+ \! Z' g
% O- ~3 ]7 L+ E$ ~ hCom1 = CreateFile("COM4",
; D$ _+ Z5 C* ?6 E* H7 i* v; C GENERIC_READ | GENERIC_WRITE,: c0 B3 a& h% h( P
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NULL,
. I% I) s' |! l2 Z' R/ Z1 [* o Z) j OPEN_EXISTING,' S7 Y, J2 N% v3 }$ R" e: x
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NULL);% ]' |) C- N: o4 d
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if (hCom1==INVALID_HANDLE_VALUE )
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printf("read open failed\n");
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else# Z" d# F" W o# \
{
: f2 x1 s, V) m( | printf("read open successed\n");
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: `% W/ B. B0 q) C7 f SetupComm(hCom1, 20480, 20480);
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" S- Q6 A, ^0 f7 L8 D) u //COMMTIMEOUTS TimeOuts; $ y( n3 g' ~/ T/ l( d7 j) c
TimeOuts.ReadIntervalTimeout =100;9 o/ D; `+ s& B
TimeOuts.ReadTotalTimeoutMultiplier =500;9 A5 p6 y3 h) s3 u1 S$ ~7 I
TimeOuts.ReadTotalTimeoutConstant = 5000; , p- d5 v4 l2 I/ E! n( {
TimeOuts.WriteTotalTimeoutMultiplier = 500;
' e. P" P" ]1 T, X2 h/ A TimeOuts.WriteTotalTimeoutConstant = 2000;8 K5 y4 n# _ x
SetCommTimeouts(hCom1, &TimeOuts);4 y3 M- X- S% X6 ]6 w. ]
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//DCB dcb1;
D, u& m7 k( D6 }; Y1 p GetCommState(hCom1, &dcb1);' K, K1 d7 L9 k% I+ S5 }, E
dcb1.BaudRate = 115200;
/ J6 V. @! ^ d/ {, ~/ K9 L, \' ] dcb1.ByteSize = 8;//一个字节8bit
3 H% p- c/ f. b" g7 x& W1 k; L dcb1.Parity = NOPARITY;//无校验) v7 R% x( B7 o, b6 C
dcb1.StopBits = ONESTOPBIT;//1位停止位3 x# C8 C, ], u0 L7 Z+ S1 n, p
dcb1.fParity = FALSE;
/ o1 m8 A: j7 S/ r* h dcb1.fNull = FALSE;
5 s6 }' _( f5 |) ~ SetCommState(hCom1, &dcb1);
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" O( \+ a; V. F8 s. U, R PurgeComm(hCom1, PURGE_TXCLEAR|PURGE_RXCLEAR);* G4 s* S4 }# _7 y: K. Z
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if(!ReadFile(hCom1, str, wCount, &wCount1, NULL))
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?1 L, y b4 F2 Q: { printf("read failed!");
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printf("read successed!");
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" b: Z# h2 E& i% [( D8 r( D printf("wCount1:%d\n", wCount1);' ~7 F' M, I% U% K
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) Z D$ l- j9 r% C! S$ g printf("read data is");+ o( I* y" r6 E) N2 x( Q- B
for(i=0;i {
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7 L3 k& J3 L$ D0 b: X printf("%02X", str);, p! T" z. s6 ~# D% x+ j
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}
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CloseHandle(hCom1);, @9 Q1 M Z4 i6 q$ I
7 G k7 Y1 s. P; q# I$ b6 w// system("pause");& t6 B: `# J1 r
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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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