checksum的编程实现

/// <summary>

/// 获取校验和，ASCII编码

/// </summary>

/// <param name="s"></param>

/// <param checkSum="s"></param>

#region 获取校验和，ASCII编码

/// <summary>

/// 获取校验和，ASCII编码

/// </summary>

/// <param name="s"></param>

/// <param checkSum="s"></param>

private bool GetCheckSum( string s , out string checkSum )

{

checkSum = ""

if ( 0 == s.Length )

return false

int sIndex = s.IndexOf( '$' ) + 1

int eIndex = s.IndexOf( "**" )

string str = ""

if ( sIndex <1 || eIndex <1 )

str = s

else

str = s.Substring( sIndex , eIndex - sIndex )

byte [] cs = Encoding.ASCII.GetBytes( str )

//核心部分

for ( int i = 0 i <cs.Length - 1 i++ )

{

cs [i + 1] = (byte) ( cs [i] ^ cs [i + 1] )

}

checkSum = cs [cs.Length - 1].ToString( "x2" ).ToUpper()

//checkSum = Convert.ToString( cs [cs.Length - 1] , 16 ).ToUpper()

return true

}

你是想把checksum.exe运行后出现的信息写到txt是吧？

比如这程序放在c:\

start c:\checksum.exe >c:\1.txt

如果它有反馈信息，就会写在c盘中1.txt里面

//========================================|功能函数

//计算效验和

uint8

CHECK_SUM(uint8

*pt,uint8

pos,uint8

len)

reentrant

{

uint8

CHECKSUM=0

pt+=pos

//预置指针到pos

while(len--)

{

if(*pt

&

BIT0){CHECKSUM++}

if(*pt

&

BIT1){CHECKSUM++}

if(*pt

&

BIT2){CHECKSUM++}

if(*pt

&

BIT3){CHECKSUM++}

if(*pt

&

BIT4){CHECKSUM++}

if(*pt

&

BIT5){CHECKSUM++}

if(*pt

&

BIT6){CHECKSUM++}

if(*pt

&

BIT7){CHECKSUM++}

pt++

}

//

F_Wtd

return

CHECKSUM

}

//========================================|

用法：

tmp=CHECK_SUM(UART_BUF,0,UART_RX_LEN)

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