1. 权限设置问题:打销漏棚开微信企业版时可能没有给摄像头相应的权限,需要进入微信企业版的设置页面,找到摄像头权限设置并打开相应权限。
2. 软件问题:某些情况下,微信企业版软件可能会出现崩溃或冲突情况,导致摄像头无法正常工作。此时可以尝试关闭微信企业版并重新启动软件。
3. 驱动问题:如果笔记本电脑的摄像头驱动程序出现问题或需要更新,则摄像头可能无法正常工作。可以尝试在设备管理器中找到摄像头并更新或重新安装驱动程序。
4. 硬件问题:如果以上方法都无法解决问题,则搜简可能是摄像头硬件出现了故障。此时需要到专业的维修点检测和修复摄像头问题。
总之,如果笔记本微信企业版视频摄像头打不开,需要逐一排查上述可能出现的问题,找出问题原因并进行相应的解决。
用C怎么写获取串口的内容看驱动程序的接口啊
一般是是open(“口名”)
用C/C++写一扒游个小程序读取串口接收到贺此销的数据你太幸运了,刚好我有一个,你在禅游vc++6.0下测试一下。
/* 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语言变成实现串口收发数据#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,好久没看了,不知到对不对。
还有下面这段:
#include
#include
HANDLE h
int main(void)
{
h=CreateFile(TEXT("COM3"),//COM1口
GENERIC_READ|GENERIC_WRITE, //允许读和写
0, //独方式
NULL,
OPEN_EXISTING, //打开而不是创建
0, //同步方式
NULL)
if(h==(HANDLE)-1)
{
printf("打开COM失败!\n")
return FALSE
}
else
{
printf("COM打开成功!\n")
}
Setupm(h,1024,1024) //输入缓冲区和输出缓冲区大小都是1024
COMMTIMEOUTS TimeOuts
//设读超时
TimeOuts.ReadIntervalTimeout=1000
TimeOuts.ReadTotalTimeoutMultiplier=500
TimeOuts.ReadTotalTimeoutConstant=5000
//设定写超时
TimeOuts.WriteTotalTimeoutMultiplier=500
TimeOuts.WriteTotalTimeoutConstant=2000
SetmTimeouts(h,&TimeOuts) //设置超时
DCB dcb
GetmState(h,&dcb)
dcb.BaudRate=9600 //波特率为9600
dcb.ByteSize=8 //每个字节有8位
dcb.Parity=NOPARITY //无奇偶校验位
dcb.StopBits=ONE5STOPBITS //两个停止位
SetmState(h,&dcb)
DWORD wCount//读取的节数
BOOL bReadStat
while(1)
{
Purgem(h,PURGE_TXCLEAR|PURGE_RXCLEAR) //清缓冲区
char str[9]={0}
printf("%s\n",str)
bReadStat=ReadFile(h,str,9,&wCount,NULL)
if(!bReadStat)
{
printf("
怎么通过串口读取51单片机某个地址的数据?请用C语言写出来。*
授人以鱼,不如授人以渔
*
首先,你要明确在C语中读取内存址是基于指针。
3.比如读取内存地址0x22中的数据
C语言中对于内存的访是基于指,这个毋庸置疑,具体 *** 如下
unsigned int *p= (unsigned int*)0x22 ;//定义针,并且使指针指向了0x22这个 内存地址;
那么*p就是最终你要读取的数据了。
4.至于如何通过串口显示到电脑我就不多了(这不是难点),据你都知道了,写到串口 缓冲区,在串口调试助手下就可以看到。
5.虽然没有贴出具体代码,但这里面的思想可以让你解决
标签:作文经典 上一篇:描写毛毛虫的词语 描写毛毛虫行动的词语 下一篇:成语误用褒贬的例子 褒贬误用的成语Linux下如何使用c/c++实现检测新增串口,并读取串口号
Linux下面有设文件
串口装好驱动后 会显示在dev下
然后对这个
C语言中如何对串口进行 *** 作C语言会有 *** 作串口的库函数的,按照串口库数标识实现调
电脑上的串口号是什么意思串口叫做串行接口,也串行通信接口,按电气标准及协议来分包括RS-232-C、RS-422、RS485、USB等。 RS-232-C、RS-422与RS-485标准对接口的电气特性做出规定,不涉及接插件、电缆或协议。USB是近几年发展起来的新型接口标准,主要应用于速数据传输域。 RS-232-C:也称标准串口,是目前最常用的一种串行通讯接口。它是在1970年由美国电子工业协会(EIA)联合贝尔系统、 调制解调器厂家及计算机终端生产厂共同制定的用于串行通讯的标 准。它的名是“数据终端设备(DTE)和数据通讯设备(DCE)之间 行二进制数据交换接口技术标准”。传统的RS-232-C接口标准有22根线,采用标准25芯D型插头座。后来的PC上使用简化了的9芯D插座。现在应用中25芯插头已很少采用。现在的电脑般有两个串行口:COM1和COM2,你到计算机后面能看到9针D形接口就是了。现在有很多手数据线或者物流接收器都采用COM
如何用C语言写一个读、写串口的程序?大致过程就是
配置串口通信,包串口号、波特、验位、停止位这些信息;
打开串口,和打开文件一样,在Linux是这样,Windows下没试过,估计也差不多;
发送数据,即写串口,就跟写文件类似;
读取
编写单片机串口收发数据的完整程序(C语言编写)我用的新唐芯片,8051内核,跟51差不多,望采纳
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)
}
这个是发送
void UART_isr (void) interrupt 4 //
怎样在WINDOWS下用C语言编写串口接收数据程序#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,不知到对不对。
还下面这段:
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#include
#include
HANDLE h
int main(void)
{
h=CreateFile(TEXT("COM3"),//COM1口
GENERIC_READ|GENERIC_WRITE, //允许读和写
0, //独占方式
NULL,
OPEN_EXISTING, //打开而不是建
0, //同步式
NULL)
if(h==(HANDLE)-1)
{
printf("打开COM失败!\n")
return FALSE
}
else
{
printf("COM打开成功!\n")
}
Setupm(h,1024,1024)//输入缓冲区和输出缓冲区的大小都是1024
COMMTIMEOUTS TimeOuts
//定读超时
TimeOuts.ReadIntervalTimeout=1000
TimeOuts.ReadTotalTimeoutMultiplier=500
TimeOuts.ReadTotalTimeoutConstant=5000
//设定写超时
TimeOuts.WriteTotalTimeoutMultiplier=500
TimeOuts.WriteTotalTimeoutConstant=2000
SetmTimeouts(h,&TimeOuts)//设置超时
DCB dcb
GetmState(h,&dcb)
dcb.BaudRate=9600//波特率为9600
dcb.ByteSize=8//每个字节有8位
dcb.Parity=NOPARITY//无奇偶校验位
dcb.StopBits=ONE5STOPBITS//两个停止位
SetmState(h,&dcb)
DWORD wCount//读取的字节
BOOL bReadStat
while(1)
{
Purgem(h,PURGE_TXCLEAR|PURGE_RXCLEAR)//清空缓冲区
char str[9]={0}
printf("%s\n",str)
bReadStat=ReadFile(h,str,9,&wCount,NULL)
if(!bReadStat)
{
printf("读串口
标签:作文经典 上一篇:描写毛毛虫的词语 描写毛毛虫行动的词语 下一篇:成语误用褒贬的例子 褒贬误用的成语
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