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#define _CRT_SECURE_NO_WARNINGS9 c. t0 w3 _3 s: B
#include6 `' X: Y, p- i
#include
" x8 m' |, E' s" J$ K: N#include "tchar.h"5 J3 e+ d% M7 G2 |1 g
* {- R* X1 B* h5 V V9 M#include' r- f) S! r( Z0 x* ~7 R
#include G' Z) T4 d( S8 D
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int mAIn()+ A# a! Z L/ L$ f
{
( X- j( b1 |% ^9 w1 p: y HANDLE hCom1;2 Z2 Q0 d% }, z
COMMtiMEOUTS TimeOuts; + C6 R: W7 G) y$ W- Y; Q# u
DCB dcb1;
2 |% I) h9 J+ \, Z6 |' _ DWORD i ;. Q0 V% j( O' ^+ P
DWORD wCount =4;9 E, j _ O2 _6 } U C1 i1 z& E
DWORD wCount1;4 ?: B" Y9 z. s: y" e' d6 ?9 M
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0 ~, Y: y" F# o0 R* x) ~5 B# e$ J h3 Q0 {" s- a( Z3 [% h
unsigned char str[8];+ H* E3 N& I! O& U7 P
0 J# e. A& V2 i. b
hCom1 = CreateFile("COM4",
# C( k! h. ]- \4 C GENERIC_READ | GENERIC_WRITE,
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NULL,
" Q' Y4 ?3 L m OPEN_EXISTING,& I( @0 g0 p% x: e0 i$ a1 j: ~$ t
0,( h' ]* h& X1 E
NULL);4 ?: g$ J; `- R7 o; @
* q& x; Z! ]& X3 E7 M \" {( \
3 {( y5 D) x# v. E$ W5 ?) B+ J' D9 W/ ] if (hCom1==INVALID_HANDLE_VALUE )
! o: k5 Z6 n) ~ t: ]1 U- b {
E8 F, Z7 e6 N/ J H6 r& j: s printf("read open failed\n");
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else1 D5 E9 G6 y `% c, U
{
) {$ W4 |( r, F ~+ r printf("read open successed\n");6 n3 H+ [6 a: j* i
}
0 D# z' Y' V- G9 G5 g% U: M: k% ? SetupComm(hCom1, 20480, 20480);
% j) ?9 l, h4 P e7 h+ C, j8 ]" R; P; j5 {/ ]% ~
//COMMTIMEOUTS TimeOuts;
' [+ |! n7 S' }" V TimeOuts.ReadIntervalTimeout =100;
$ v: f/ b; i4 g8 V TimeOuts.ReadTotalTimeoutMultiplier =500;; e5 U+ v7 u) z2 {
TimeOuts.ReadTotalTimeoutConstant = 5000; 4 Y G( x9 g& C ?4 w8 U( g o3 J
TimeOuts.WriteTotalTimeoutMultiplier = 500;
3 r+ G/ \; n, X TimeOuts.WriteTotalTimeoutConstant = 2000;
4 x$ F+ o" g# x. W, c SetCommTimeouts(hCom1, &TimeOuts);
: \9 i4 O! O; X' K
+ v) K- h% Z" Z& L9 I7 E& C //DCB dcb1;) Z% a- ]0 k2 J. U, L' d; `1 p
GetCommState(hCom1, &dcb1);
1 [% \6 b( J2 `9 V dcb1.BaudRate = 115200;+ z0 _/ Z" z' W
dcb1.ByteSize = 8;//一个字节8bit
m# | N4 m' |% ] dcb1.Parity = NOPARITY;//无校验, f% [; Y. c& n+ @+ F( @: g4 [
dcb1.StopBits = ONESTOPBIT;//1位停止位2 o% H7 o. k q$ q
dcb1.fParity = FALSE;
2 r, |0 x$ c4 e* B0 J dcb1.fNull = FALSE;
; w) ~- L7 Z) R2 f SetCommState(hCom1, &dcb1);
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/ ~3 k, n0 ]& x" g. ~# S: I0 q PurgeComm(hCom1, PURGE_TXCLEAR|PURGE_RXCLEAR);
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) F$ O5 {9 g: H; B3 i if(!ReadFile(hCom1, str, wCount, &wCount1, NULL))
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printf("read failed!");" T+ H) ?7 y4 |2 ?! ?
0 i0 g1 F) ?, W }
1 q7 O; e1 Y; w else" n/ `* a' @& y% ^) k3 Z i
{$ D3 L( w- M+ n, X
printf("read successed!");
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) W4 r& X5 \7 v/ l* x printf("wCount1:%d\n", wCount1);/ ~( b) g: R& m( [
1 V5 ?/ F8 ]7 M, ~
$ N4 w4 L: W" s' K5 ?1 b- u7 u1 _
printf("read data is");( T/ Q$ J3 w0 ~4 s1 k% ^; {# f- X
for(i=0;i {
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( u5 K4 j+ V; i9 ` _8 u printf("%02X", str);
# ?, O% d, ]: I; a9 u( E5 m/ b }# \" K6 G8 l' W! X
}
/ q* b. F+ z; b6 u& P% a: _% ?
2 E' v8 ?% ]# L! }* O- D3 j8 \3 U8 ] i. R, n/ N+ H: i
! |" Z) U# M7 V9 U' R1 G5 L5 O' ^8 L0 ]: _5 `# w' \
CloseHandle(hCom1);0 @( c( U+ q% s1 k1 S+ p; j
4 B$ R4 F3 E: |8 x9 j// system("pause");
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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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发表于 2023-3-14 14:10
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