C++学习笔记

1、long类型到char类型转换

long a=1;
char * objid=(char *)malloc(10*sizeof(char)); //分配内存
sprintf(objid,"%d",a); 

2、拼接char字符串

 long aa=pFeature->GetFID();
 char * objid=(char *)malloc(10*sizeof(char)); //分配内存
 sprintf(objid,"%d",aa); 
 const char * pointid=fea->GetFieldAsString("管线编号");
 char sql[200]="update point set 对应管线='";
 strcat(sql,pointid);
 strcat(sql,"' where OBJECTID=");
 strcat(sql,objid);