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c語言串口庫函數(shù) c語言串口通信函數(shù)

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,按照串口庫函數(shù)標識實現(xiàn)調(diào)用就可以了。

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c 獲取串口號 c 自動獲取串口號

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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單片機串口收發(fā)中,用printf和用sbuf的區(qū)別在哪里

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

C語言字符串處理的庫函數(shù)有哪些

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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