C語言會有操作串口的庫函數(shù)的,按照串口庫函數(shù)標識實現(xiàn)調(diào)用就可以了。
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用C怎么寫獲取串口的內(nèi)容
看驅(qū)動程序的接口啊
一般是是open(“口名”)
用C/C++寫一扒游個小程序讀取串口接收到賀此銷的數(shù)據(jù)
你太幸運了,剛好我有一個,你在禪游vc++6.0下測試一下。
/* serrecv.c */
/* Receives and saves a file over a serial port */
/* Last modified: Septemeber 21, 2005 */
/* [goman89] */
#include
#include
#include
/* Function to print out usage information */
void usage(void);
/* Function to set up the serial port settings with the specified baud rate,
no parity, and one stop bit */
void set_up_serial_port(HANDLE h, long baud);
/* Function to receive and save file from serial port */
void get_file_from_serial_port(HANDLE h, char *file_name, unsigned long file_length);
int main(int argc, char **argv)
{
HANDLE serial_port; /* Handle to the serial port */
long baud_rate = 9600; /* Baud rate */
char port_name[] = "COM1:"; /* Name of serial port */
unsigned long file_size; /* Size of file to receive in bytes */
unsigned long bytes_received; /* Bytes received from serial port */
unsigned long file_name_size; /* Size of file name in bytes */
char file_name[256]; /* Name of file to receive */
/* Check mand line */
if (argc == 3)
{
/* Read in baud rate */
if (argv[1][1] != 'b' || sscanf(argv[2], "%ld", baud_rate) != 1)
{
usage;
exit(0);
}
}
else if (argc != 1)
{
usage;
exit(0);
}
/* Open up a handle to the serial port */
serial_port = CreateFile(port_name, GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, 0, 0);
/* Make sure port was opened */
if (serial_port == INVALID_HANDLE_VALUE)
{
fprintf(stderr, "Error opening port\n");
CloseHandle(serial_port);
exit(0);
}
/* Set up the serial port */
set_up_serial_port(serial_port, baud_rate);
/* Receive file name size from serial port */
ReadFile(serial_port, (void *)file_name_size, sizeof(unsigned long), bytes_received, NULL);
if (bytes_received != sizeof(unsigned long))
{
fprintf(stderr, "Error getting file name size.\n");
CloseHandle(serial_port);
exit(0);
}
/* Receive file name from serial port */
ReadFile(serial_port, (void *)file_name, file_name_size, bytes_received, NULL);
if (bytes_received != file_name_size)
{
fprintf(stderr, "Error retrieving file name.\n");
CloseHandle(serial_port);
exit(0);
}
/* Append NULL terminator to end of string */
file_name[bytes_received] = '\0';
/* Receive file size from serial port */
ReadFile(serial_port, (void *)file_size, sizeof(unsigned long), bytes_received, NULL);
if (bytes_received != sizeof(unsigned long))
{
fprintf(stderr, "Error getting file size.\n");
CloseHandle(serial_port);
exit(0);
}
/* Get the file from the serial port */
get_file_from_serial_port(serial_port, file_name, file_size);
/* Print out success information */
printf("\n%lu bytes successfully received and saved as %s\n", file_size, file_name);
/* Close handle */
CloseHandle(serial_port);
return 0;
}
void usage(void)
{
fprintf(stderr, "Usage:\n");
fprintf(stderr, "\tserrecv [-b baud rate]\n");
fprintf(stderr, "\tDefault baud rate is 9600\n");
fprintf(stderr, "tSupported baud rates: 1200, 2400, 4800, 9600, 14400, 19200\n");
return;
}
void set_up_serial_port(HANDLE h, long baud)
{
DCB properties; /* Properties of serial port */
/* Get the properties */
GetmState(h, properties);
/* Set the baud rate */
switch(baud)
{
case 1200:
properties.BaudRate = CBR_1200;
break;
case 2400:
properties.BaudRate = CBR_2400;
break;
case 4800:
properties.BaudRate = CBR_4800;
break;
case 9600:
properties.BaudRate = CBR_9600;
break;
case 14400:
properties.BaudRate = CBR_14400;
break;
case 19200:
properties.BaudRate = CBR_19200;
break;
case 38400:
properties.BaudRate = CBR_38400;
break;
default:
fprintf(stderr, "Invalid baud rate: %ld\n", baud);
usage;
exit(0);
break;
}
/* Set the other properties */
properties.Parity = NOPARITY;
properties.ByteSize = 8;
properties.StopBits = ONESTOPBIT;
SetmState(h, properties);
return;
}
void get_file_from_serial_port(HANDLE h, char *file_name, unsigned long file_length)
{
FILE *data_file; /* File to create */
unsigned long bytes_left = file_length; /* Bytes left to receive */
unsigned long bytes_received_total = 0; /* Total bytes received */
unsigned long bytes_to_receive; /* Number of bytes to receive */
unsigned long bytes_received; /* Number of bytes receive */
char buffer[200]; /* Buffer to store data */
/* Open the file */
data_file = fopen(file_name, "wb");
/* Quit if file couldn't be opened */
if (data_file == NULL)
{
fprintf(stderr, "Could not create file %s\n", file_name);
CloseHandle(h);
exit(0);
}
while (1)
{
/* Determine how many bytes to read */
if (bytes_left == 0)
{
break;
}
else if (bytes_left 200)
{
bytes_to_receive = bytes_left;
}
else
{
bytes_to_receive = 200;
}
/* Receive data over serial cable */
ReadFile(h, (void *)buffer, bytes_to_receive, bytes_received, NULL);
if (bytes_received != bytes_to_receive)
{
fprintf(stderr, "Error reading file.\n");
CloseHandle(h);
exit(0);
}
/* Save buffer to file */
fwrite((void *)buffer, 1, bytes_received, data_file);
/* Decrement number of bytes left */
bytes_left -= bytes_received;
/* Increment number of bytes received */
bytes_received_total += bytes_received;
/* Print out progress */
printf("\r%5lu bytes received.", bytes_received_total);
}
fclose(data_file);
return;
}
C語言變成實現(xiàn)串口收發(fā)數(shù)據(jù)
#include?
#include?
int?main(void)
{
FILE?*fp;
char?temp;
char?buf[100];
if((fp?=?fopen("3","r"))?==?NULL)
puts("this?way?doesn't?work!\n");
else
puts("this?way?works!\n");
while(1)
{
temp?=?0;
fscanf(fp,"%c",temp);
if(temp?!=?0)
putchar(temp);
else
Sleep(100);
}
fclose(fp);
return?0;
}
以前弄的,好久沒看了,不知到對不對。
還有下面這段:
#include?
#include?
HANDLE?h;
int?main(void)
{
h=CreateFile(TEXT("COM3"),//COM1口
GENERIC_READ|GENERIC_WRITE,?//允許讀和寫
0,?//獨方式
NULL,
OPEN_EXISTING,?//打開而不是創(chuàng)建
0,?//同步方式
NULL);
if(h==(HANDLE)-1)
{
printf("打開COM失敗!\n");
return?FALSE;
}
else
{
printf("COM打開成功!\n");
}
Setupm(h,1024,1024);?//輸入緩沖區(qū)和輸出緩沖區(qū)大小都是1024
COMMTIMEOUTS?TimeOuts;
//設讀超時
TimeOuts.ReadIntervalTimeout=1000;
TimeOuts.ReadTotalTimeoutMultiplier=500;
TimeOuts.ReadTotalTimeoutConstant=5000;
//設定寫超時
TimeOuts.WriteTotalTimeoutMultiplier=500;
TimeOuts.WriteTotalTimeoutConstant=2000;
SetmTimeouts(h,TimeOuts);?//設置超時
DCB?dcb;
GetmState(h,dcb);
dcb.BaudRate=9600;?//波特率為9600
dcb.ByteSize=8;?//每個字節(jié)有8位
dcb.Parity=NOPARITY;?//無奇偶校驗位
dcb.StopBits=ONE5STOPBITS;?//兩個停止位
SetmState(h,dcb);
DWORD?wCount;//讀取的節(jié)數(shù)
BOOL?bReadStat;
while(1)
{
Purgem(h,PURGE_TXCLEAR|PURGE_RXCLEAR);?//清緩沖區(qū)
char?str[9]={0};
printf("%s\n",str);
bReadStat=ReadFile(h,str,9,wCount,NULL);
if(!bReadStat)
{
printf("
怎么通過串口讀取51單片機某個地址的數(shù)據(jù)?請用C語言寫出來。
*
授人以魚,不如授人以漁
*
首先,你要明確在C語中讀取內(nèi)存址是基于指針。
3.比如讀取內(nèi)存地址0x22中的數(shù)據(jù)
C語言中對于內(nèi)存的訪是基于指,這個毋庸置疑,具體操如下
unsigned int *p= (unsigned int*)0x22 ;//定義針,并且使指針指向了0x22這個 ? ? ? ?內(nèi)存地址;
那么*p就是最終你要讀取的數(shù)據(jù)了。
4.至于如何通過串口顯示到電腦我就不多了(這不是難點),據(jù)你都知道了,寫到串口 ? 緩沖區(qū),在串口調(diào)試助手下就可以看到。
5.雖然沒有貼出具體代碼,但這里面的思想可以讓你解決
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Linux下如何使用c/c++實現(xiàn)檢測新增串口,并讀取串口號
Linux下面有設文件
串口裝好驅(qū)動后 會顯示在dev下
然后對這個
C語言中如何對串口進行操作
C語言會有操作串口的庫函數(shù)的,按照串口庫數(shù)標識實現(xiàn)調(diào)
電腦上的串口號是什么意思
串口叫做串行接口,也串行通信接口,按電氣標準及協(xié)議來分包括RS-232-C、RS-422、RS485、USB等。 RS-232-C、RS-422與RS-485標準對接口的電氣特性做出規(guī)定,不涉及接插件、電纜或協(xié)議。USB是近幾年發(fā)展起來的新型接口標準,主要應用于速數(shù)據(jù)傳輸域。 RS-232-C:也稱標準串口,是目前最常用的一種串行通訊接口。它是在1970年由美國電子工業(yè)協(xié)會(EIA)聯(lián)合貝爾系統(tǒng)、 調(diào)制解調(diào)器廠家及計算機終端生產(chǎn)廠共同制定的用于串行通訊的標 準。它的名是“數(shù)據(jù)終端設備(DTE)和數(shù)據(jù)通訊設備(DCE)之間 行二進制數(shù)據(jù)交換接口技術標準”。傳統(tǒng)的RS-232-C接口標準有22根線,采用標準25芯D型插頭座。后來的PC上使用簡化了的9芯D插座?,F(xiàn)在應用中25芯插頭已很少采用?,F(xiàn)在的電腦般有兩個串行口:COM1和COM2,你到計算機后面能看到9針D形接口就是了。現(xiàn)在有很多手數(shù)據(jù)線或者物流接收器都采用COM
如何用C語言寫一個讀、寫串口的程序?
大致過程就是
配置串口通信,包串口號、波特、驗位、停止位這些信息;
打開串口,和打開文件一樣,在Linux是這樣,Windows下沒試過,估計也差不多;
發(fā)送數(shù)據(jù),即寫串口,就跟寫文件類似;
讀取
編寫單片機串口收發(fā)數(shù)據(jù)的完整程序(C語言編寫)
我用的新唐芯片,8051內(nèi)核,跟51差不多,望采納
void UART_Initial (void)
{
P02_Quasi_Mode; //Setting UART pin as Quasi mode for tran *** it
P16_Quasi_Mode; //Setting UART pin as Quasi mode for tran *** it
SCON_1 = 0x50; //UART1 Mode1,REN_1=1,TI_1=1
T3CON = 0x08; //T3PS2=0,T3PS1=0,T3PS0=0(Prescale=1), UART1 in MODE 1
clr_BRCK;
RH3 = HIBYTE(65536 - (1000000/u32Baudrate)-1); /*16 MHz */
RL3 = LOBYTE(65536 - (1000000/u32Baudrate)-1); /*16 MHz */
set_TR3; //Trigger Timer3
}
以上是初始化的
void Send_Data_To_UART1(UINT8 c)
{
TI_1 = 0;
SBUF_1 = c;
while(TI_1==0);
}
這個是發(fā)送
void UART_isr (void) interrupt 4 //
怎樣在WINDOWS下用C語言編寫串口接收數(shù)據(jù)程序
#include
#include
int main(void)
{
FILE *fp;
char temp;
char buf[100];
if((fp = fopen("3","r")) == NULL)
puts("this way doesn't work!\n");
else
puts("this way works!\n");
while(1)
{
temp = 0;
fscanf(fp,"%c",temp);
if(temp != 0)
putchar(temp);
else
Sleep(100);
}
fclose(fp);
return 0;
}
以前的,好久看,不知到對不對。
還下面這段:
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#include
#include
HANDLE h;
int main(void)
{
h=CreateFile(TEXT("COM3"),//COM1口
GENERIC_READ|GENERIC_WRITE, //允許讀和寫
0, //獨占方式
NULL,
OPEN_EXISTING, //打開而不是建
0, //同步式
NULL);
if(h==(HANDLE)-1)
{
printf("打開COM失敗!\n");
return FALSE;
}
else
{
printf("COM打開成功!\n");
}
Setupm(h,1024,1024); //輸入緩沖區(qū)和輸出緩沖區(qū)的大小都是1024
COMMTIMEOUTS TimeOuts;
//定讀超時
TimeOuts.ReadIntervalTimeout=1000;
TimeOuts.ReadTotalTimeoutMultiplier=500;
TimeOuts.ReadTotalTimeoutConstant=5000;
//設定寫超時
TimeOuts.WriteTotalTimeoutMultiplier=500;
TimeOuts.WriteTotalTimeoutConstant=2000;
SetmTimeouts(h,TimeOuts); //設置超時
DCB dcb;
GetmState(h,dcb);
dcb.BaudRate=9600; //波特率為9600
dcb.ByteSize=8; //每個字節(jié)有8位
dcb.Parity=NOPARITY; //無奇偶校驗位
dcb.StopBits=ONE5STOPBITS; //兩個停止位
SetmState(h,dcb);
DWORD wCount;//讀取的字節(jié)
BOOL bReadStat;
while(1)
{
Purgem(h,PURGE_TXCLEAR|PURGE_RXCLEAR); //清空緩沖區(qū)
char str[9]={0};
printf("%s\n",str);
bReadStat=ReadFile(h,str,9,wCount,NULL);
if(!bReadStat)
{
printf("讀串口
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sbuf 是51單片機中的串亮旅口數(shù)據(jù)寄存器,接收和發(fā)送用的升啟都是它(實際是兩敬笑凳個寄存器),
而printf是C語言的庫函數(shù),它可以通過串口和并口輸出數(shù)據(jù),若用串口輸出數(shù)據(jù),需重新定位fput c()函數(shù),printf調(diào)用fput c()函數(shù),fput c()函數(shù)調(diào)用串口發(fā)送命令,最終是操作sbuf 這個寄存器
函數(shù)名: strrchr
功 能: 在串中查找指定字森告宴符的最后一個出現(xiàn)
用 法: char *strrchr(char *str, char c);
舉例:
[cpp] view plain copy
char fullname="./lib/lib1.so";
char *ptr;
ptr = strrchr(fullname,'/');
printf("filename is %s",++ptr);
//運行結(jié)果:filename is lib1.so
函數(shù)名: strchr
功 能: 在串中查找指定字符的第一個出現(xiàn)友慎
用 法: char *strchr(char *str, char c);
舉例:
[cpp] view plain copy
char fullname="./lib/lib1.so";
char *ptr;
ptr = strrchr(fullname,'.');
printf("after strchr() is %s",++ptr);
//運行結(jié)此銀果:after strchr() is /lib/lib1.so
函數(shù)名: strtok
功 能: 在串中查找指定字符的第一個出現(xiàn)
用 法: char *strtok(char *s, char *delim);
說明:
1.strtok函數(shù)的實質(zhì)上的處理是,strtok在s中查找包含在delim中的字符并用NULL(’/0′)來替換,直到找遍整個字符串。這句話有兩層含義:(1)每次調(diào)用strtok函數(shù)只能獲得一個分割單位。(2)要獲得所有的分割單元必須反復調(diào)用strtok函數(shù)。
2.strtok函數(shù)以后的調(diào)用時的需用NULL來替換s.
3.形參s(要分割的字符串)對應的變量應用char s[]=”….”形式,而不能用char *s=”….”形式。
舉例:
[cpp] view plain copy
void main()
{
char buf[]=”Golden Global View”;
char* token = strtok( buf, ” “);
while( token != NULL )
{
printf( ”%s “, token );
token = strtok( NULL, ” “);
}
return 0;
}
/*其結(jié)果為:
Golden
Global
View
*/
函數(shù)名:strncpy
功能:把src所指由NULL結(jié)束的字符串的前n個字節(jié)復制到dest所指的數(shù)組中
用法:char *strncpy(char *dest, char *src, int n);
說明:
如果src的前n個字節(jié)不含NULL字符,則結(jié)果不會以NULL字符結(jié)束。
如果src的長度小于n個字節(jié),則以NULL填充dest直到復制完n個字節(jié)。
src和dest所指內(nèi)存區(qū)域不可以重疊且dest必須有足夠的空間來容納src的字符串。
返回指向dest的指針。
舉例:
[c-sharp] view plain copy
#include syslib.h
#include string.h
main()
{
char buf[4];
char *s="abcdefg";
strncpy(buf,s,4);
printf("%s/n",buf);
return 0;
}
/*運行結(jié)果:
abcd
*/
函數(shù)名: stpcpy
功 能: 拷貝一個字符串到另一個
用 法: char *stpcpy(char *destin, char *source);
舉例:
[cpp] view plain copy
#include stdio.h
#include string.h
int main(void)
{
char string[10];
char *str1 = "abcdefghi";
stpcpy(string, str1);
printf("%s/n", string);
return 0;
}
/*運行結(jié)果
abcdefghi
*/
函數(shù)名: strcat
功 能: 字符串拼接函數(shù)
用 法: char *strcat(char *destin, char *source);
舉例:
[cpp] view plain copy
#include string.h
#include stdio.h
int main(void)
{
char destination[25];
char *blank = " ", *c = "C++", *Borland = "Borland";
strcpy(destination, Borland);
strcat(destination, blank);
strcat(destination, c);
printf("%s/n", destination);
return 0;
}
/*運行結(jié)果:
Borland C++
*/
函數(shù)名: strcmp
功 能: 串比較
用 法: int strcmp(char *str1, char *str2);
看Asic碼,str1str2,返回值 0;兩串相等,返回0
舉例:
[cpp] view plain copy
#include string.h
#include stdio.h
int main(void)
{
char *buf1 = "aaa", *buf2 = "bbb";
int ptr;
ptr = strcmp(buf2, buf1);
if (ptr 0)
printf("buffer 2 is greater than buffer 1/n");
else if(ptr 0)
printf("buffer 2 is less than buffer 1/n");
else
printf("buffer 2 is equal with buffer 1/n");
return 0;
}
/*運行結(jié)果:
buffer 2 is greater than buffer 1
*/
函數(shù)名: strncmpi
功 能: 將一個串中的一部分與另一個串比較, 不管大小寫
用 法: int strncmpi(char *str1, char *str2, unsigned maxlen);
舉例:
[cpp] view plain copy
#include string.h
#include stdio.h
int main(void)
{
char *buf1 = "BBB", *buf2 = "bbb";
int ptr;
ptr = strcmpi(buf2, buf1);
if (ptr 0)
printf("buffer 2 is greater than buffer 1/n");
if (ptr 0)
printf("buffer 2 is less than buffer 1/n");
if (ptr == 0)
printf("buffer 2 equals buffer 1/n");
return 0;
}
函數(shù)名: strcspn
功 能: 在串中查找第一個給定字符集內(nèi)容的段
用 法: int strcspn(char *str1, char *str2);
舉例:
[cpp] view plain copy
#include stdio.h
#include string.h
#include alloc.h
int main(void)
{
char *string1 = "1234567890";
char *string2 = "747DC8";
int length;
length = strcspn(string1, string2);
printf("Character where strings intersect is at position %d/n", length);
return 0;
}
函數(shù)名: strdup
功 能: 將串拷貝到新建的位置處
用 法: char *strdup(char *str);
舉例:
[cpp] view plain copy
#include stdio.h
#include string.h
#include alloc.h
int main(void)
{
char *dup_str, *string = "abcde";
dup_str = strdup(string);
printf("%s/n", dup_str);
free(dup_str);
return 0;
}
函數(shù)名: stricmp
功 能: 以大小寫不敏感方式比較兩個串
用 法: int stricmp(char *str1, char *str2);
舉例:
[cpp] view plain copy
#include string.h
#include stdio.h
int main(void)
{
char *buf1 = "BBB", *buf2 = "bbb";
int ptr;
ptr = stricmp(buf2, buf1);
if (ptr 0)
printf("buffer 2 is greater than buffer 1/n");
if (ptr 0)
printf("buffer 2 is less than buffer 1/n");
if (ptr == 0)
printf("buffer 2 equals buffer 1/n");
return 0;
}
函數(shù)名: strerror
功 能: 返回指向錯誤信息字符串的指針
用 法: char *strerror(int errnum);
舉例:
[cpp] view plain copy
#include stdio.h
#include errno.h
int main(void)
{
char *buffer;
buffer = strerror(errno);
printf("Error: %s/n", buffer);
return 0;
}
函數(shù)名: strncmp
功 能: 串比較
用 法: int strncmp(char *str1, char *str2, int maxlen);
舉例:
[cpp] view plain copy
#include string.h
#include stdio.h
int main(void)
{
char *buf1 = "aaabbb", *buf2 = "bbbccc", *buf3 = "ccc";
int ptr;
ptr = strncmp(buf2,buf1,3);
if (ptr 0)
printf("buffer 2 is greater than buffer 1/n");
else
printf("buffer 2 is less than buffer 1/n");
ptr = strncmp(buf2,buf3,3);
if (ptr 0)
printf("buffer 2 is greater than buffer 3/n");
else
printf("buffer 2 is less than buffer 3/n");
return(0);
}
函數(shù)名: strncmpi
功 能: 把串中的一部分與另一串中的一部分比較, 不管大小寫
用 法: int strncmpi(char *str1, char *str2, int len);
舉例:
[cpp] view plain copy
#include string.h
#include stdio.h
int main(void)
{
char *buf1 = "BBBccc", *buf2 = "bbbccc";
int ptr;
ptr = strncmpi(buf2,buf1,3);
if (ptr 0)
printf("buffer 2 is greater than buffer 1/n");
if (ptr 0)
printf("buffer 2 is less than buffer 1/n");
if (ptr == 0)
printf("buffer 2 equals buffer 1/n");
return 0;
}
函數(shù)名: strnset
功 能: 將一個串中的所有字符都設為指定字符
用 法: char *strnset(char *str, char ch, unsigned n);
舉例:
[cpp] view plain copy
#include stdio.h
#include string.h
int main(void)
{
char *string = "abcdefghijklmnopqrstuvwxyz";
char letter = 'x';
printf("string before strnset: %s/n", string);
strnset(string, letter, 13);
printf("string after strnset: %s/n", string);
return 0;
}
函數(shù)名: strpbrk
功 能: 在串中查找給定字符集中的字符
用 法: char *strpbrk(char *str1, char *str2);
舉例:
[cpp] view plain copy
#include stdio.h
#include string.h
int main(void)
{
char *string1 = "abcdefghijklmnopqrstuvwxyz";
char *string2 = "onm";
char *ptr;
ptr = strpbrk(string1, string2);
if (ptr)
printf("strpbrk found first character: %c/n", *ptr);
else
printf("strpbrk didn't find character in set/n");
return 0;
}
函數(shù)名: strrev
功 能: 串倒轉(zhuǎn)
用 法: char *strrev(char *str);
舉例:
[cpp] view plain copy
#include string.h
#include stdio.h
int main(void)
{
char *forward = "string";
printf("Before strrev(): %s/n", forward);
strrev(forward);
printf("After strrev(): %s/n", forward);
return 0;
}
/*運行結(jié)果:
Before strrev(): string
After strrev(): gnirts
*/
函數(shù)名: strstr
功 能: 在串中查找指定字符串的第一次出現(xiàn)
用 法: char *strstr(char *str1, char *str2);
舉例:
[cpp] view plain copy
#include stdio.h
#include string.h
int main(void)
{
char *str1 = "Borland International", *str2 = "nation", *ptr;
ptr = strstr(str1, str2);
printf("The substring is: %s/n", ptr);
return 0;
}
函數(shù)名: strtod
功 能: 將字符串轉(zhuǎn)換為double型值
用 法: double strtod(char *str, char **endptr);
舉例:
[cpp] view plain copy
#include stdio.h
#include stdlib.h
int main(void)
{
char input[80], *endptr;
double value;
printf("Enter a floating point number:");
gets(input);
value = strtod(input, endptr);
printf("The string is %s the number is %lf/n", input, value);
return 0;
}
函數(shù)名: strtol
功 能: 將串轉(zhuǎn)換為長整數(shù)
用 法: long strtol(char *str, char **endptr, int base);
舉例:
[cpp] view plain copy
#include stdlib.h
#include stdio.h
int main(void)
{
char *string = "87654321", *endptr;
long lnumber;
/* strtol converts string to long integer */
lnumber = strtol(string, endptr, 10);
printf("string = %s long = %ld/n", string, lnumber);
return 0;
}
函數(shù)名: strupr
功 能: 將串中的小寫字母轉(zhuǎn)換為大寫字母
用 法: char *strupr(char *str);
舉例:
[cpp] view plain copy
#include stdio.h
#include string.h
int main(void)
{
char *string = "abcdefghijklmnopqrstuvwxyz", *ptr;
/* converts string to upper case characters */
ptr = strupr(string);
printf("%s/n", ptr);
return 0;
}
本文標題:c語言串口庫函數(shù) c語言串口通信函數(shù)
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