void guid(char * messageId)
{
int itera_num,rand_num,i,j,k=k+1;
char StrTable[]="abcdefghijklmnopqrstuvwxyz1234567890";
char string1[24]="";
char string2[24]="";
char string3[24]="";
char string4[24]="";
char string5[24]="";
char string5_temp[24]="";
char messageId[126]="";
char * conn = "-";
for (i=0;i<=7;i++){
rand_num=rand()%36;
strncat(string1,StrTable+rand_num,1);}
for (i=0;i<=3;i++){
rand_num=rand()%36;
strncat(string2,StrTable+rand_num,1);}
for (i=0;i<=3;i++){
rand_num=rand()%36;
strncat(string3,StrTable+rand_num,1);}
for (i=0;i<=3;i++){
rand_num=rand()%36;
strncat(string4,StrTable+rand_num,1);}
for (i=0;i<=11;i++){
rand_num=rand()%36;
strncat(string5,StrTable+rand_num,1);}
strcpy(messageId, string1);
strcat(messageId, conn);
strcat(messageId, string2);
strcat(messageId, conn);
strcat(messageId, string3);
strcat(messageId, conn);
strcat(messageId, string4);
strcat(messageId, conn);
strcat(messageId, string5);
}
{
int itera_num,rand_num,i,j,k=k+1;
char StrTable[]="abcdefghijklmnopqrstuvwxyz1234567890";
char string1[24]="";
char string2[24]="";
char string3[24]="";
char string4[24]="";
char string5[24]="";
char string5_temp[24]="";
char messageId[126]="";
char * conn = "-";
for (i=0;i<=7;i++){
rand_num=rand()%36;
strncat(string1,StrTable+rand_num,1);}
for (i=0;i<=3;i++){
rand_num=rand()%36;
strncat(string2,StrTable+rand_num,1);}
for (i=0;i<=3;i++){
rand_num=rand()%36;
strncat(string3,StrTable+rand_num,1);}
for (i=0;i<=3;i++){
rand_num=rand()%36;
strncat(string4,StrTable+rand_num,1);}
for (i=0;i<=11;i++){
rand_num=rand()%36;
strncat(string5,StrTable+rand_num,1);}
strcpy(messageId, string1);
strcat(messageId, conn);
strcat(messageId, string2);
strcat(messageId, conn);
strcat(messageId, string3);
strcat(messageId, conn);
strcat(messageId, string4);
strcat(messageId, conn);
strcat(messageId, string5);
}
本文介绍了一种使用随机字符生成消息ID的方法,通过分段生成并连接不同的字符集来创建一个长度为126的唯一标识符。此过程涉及随机数生成、字符串操作和字符集的组合。
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