步驟1:新建CRC8.c檔案，程式碼如下：

unsigned char crc_array[256] = {
    0x00, 0x5e, 0xbc, 0xe2, 0x61, 0x3f, 0xdd, 0x83,
    0xc2, 0x9c, 0x7e, 0x20, 0xa3, 0xfd, 0x1f, 0x41,
    0x9d, 0xc3, 0x21, 0x7f, 0xfc, 0xa2, 0x40, 0x1e,
    0x5f, 0x01, 0xe3, 0xbd, 0x3e, 0x60, 0x82, 0xdc,
    0x23, 0x7d, 0x9f, 0xc1, 0x42, 0x1c, 0xfe, 0xa0,
    0xe1, 0xbf, 0x5d, 0x03, 0x80, 0xde, 0x3c, 0x62,
    0xbe, 0xe0, 0x02, 0x5c, 0xdf, 0x81, 0x63, 0x3d,
    0x7c, 0x22, 0xc0, 0x9e, 0x1d, 0x43, 0xa1, 0xff,
    0x46, 0x18, 0xfa, 0xa4, 0x27, 0x79, 0x9b, 0xc5,
    0x84, 0xda, 0x38, 0x66, 0xe5, 0xbb, 0x59, 0x07,
    0xdb, 0x85, 0x67, 0x39, 0xba, 0xe4, 0x06, 0x58,
    0x19, 0x47, 0xa5, 0xfb, 0x78, 0x26, 0xc4, 0x9a,
    0x65, 0x3b, 0xd9, 0x87, 0x04, 0x5a, 0xb8, 0xe6,
    0xa7, 0xf9, 0x1b, 0x45, 0xc6, 0x98, 0x7a, 0x24,
    0xf8, 0xa6, 0x44, 0x1a, 0x99, 0xc7, 0x25, 0x7b,
    0x3a, 0x64, 0x86, 0xd8, 0x5b, 0x05, 0xe7, 0xb9,
    0x8c, 0xd2, 0x30, 0x6e, 0xed, 0xb3, 0x51, 0x0f,
    0x4e, 0x10, 0xf2, 0xac, 0x2f, 0x71, 0x93, 0xcd,
    0x11, 0x4f, 0xad, 0xf3, 0x70, 0x2e, 0xcc, 0x92,
    0xd3, 0x8d, 0x6f, 0x31, 0xb2, 0xec, 0x0e, 0x50,
    0xaf, 0xf1, 0x13, 0x4d, 0xce, 0x90, 0x72, 0x2c,
    0x6d, 0x33, 0xd1, 0x8f, 0x0c, 0x52, 0xb0, 0xee,
    0x32, 0x6c, 0x8e, 0xd0, 0x53, 0x0d, 0xef, 0xb1,
    0xf0, 0xae, 0x4c, 0x12, 0x91, 0xcf, 0x2d, 0x73,
    0xca, 0x94, 0x76, 0x28, 0xab, 0xf5, 0x17, 0x49,
    0x08, 0x56, 0xb4, 0xea, 0x69, 0x37, 0xd5, 0x8b,
    0x57, 0x09, 0xeb, 0xb5, 0x36, 0x68, 0x8a, 0xd4,
    0x95, 0xcb, 0x29, 0x77, 0xf4, 0xaa, 0x48, 0x16,
    0xe9, 0xb7, 0x55, 0x0b, 0x88, 0xd6, 0x34, 0x6a,
    0x2b, 0x75, 0x97, 0xc9, 0x4a, 0x14, 0xf6, 0xa8,
    0x74, 0x2a, 0xc8, 0x96, 0x15, 0x4b, 0xa9, 0xf7,
    0xb6, 0xe8, 0x0a, 0x54, 0xd7, 0x89, 0x6b, 0x35,
    };
unsigned char CRC8_Table(unsigned char *p, char counter)
{
   unsigned char crc8 = 0;
   for( ; counter > 0; counter--)  
   {
       crc8 = crc_array[crc8^*p]; //查表得到CRC碼
       p++;
   }
   return crc8;  
}
 

步驟2：在loadrunner中引用CRC8.c檔案，如下圖：

步驟3：在loadrunner的action中，先在包頭引入CRC8.c檔案，並寫呼叫程式碼，如下：

#include "lrs.h"
#include "CRC8.c"

Action()
{	
	unsigned char buf[1024];
	unsigned char crc_result;
	char Buffer[] = "DB655B0FF91B";
	char *psrc=Buffer;
        char * hex_str;
	int i;
	char dst[1024];
	char buffers [1024];

	 //進行CRC8校驗
	 //16進位制字元轉位元組陣列
         for(i=0;*psrc;i++){
		strcpy(dst,"0X");
		strncat(dst,psrc,2);
		buf[i]= strtol(dst,NULL,16);
		psrc+=2;
	 }
	 crc_result=CRC8_Table(buf,strlen(buf));   //進行CRC8檢驗
	 lr_output_message("16進位制的CRC8校驗值: %x",crc_result);

	 //將10進位制數字轉16進位制字串
	 sprintf(buffers, "%x", (int)crc_result);
	 lr_output_message("16進位制字串的CRC8校驗: %s\n", buffers);

	 //組裝CRC8校驗校驗值 
	 strcat(Buffer,buffers);
	 lr_output_message("組裝後的Buffer值為>>: %s",Buffer);

    return 0;
}
 

最後，執行結果：

Starting iteration 1.
Starting action Action.
Action.c(66): 16進位制的CRC8校驗值: 7a
Action.c(71): 16進位制字串的CRC8校驗: 7a
Action.c(75): 組裝後的Buffer值為>>: DB655B0FF91B7a
Ending action Action.
Ending iteration 1.