ascii码字符串转成整型数组

for(int buffer_len=1;buffer_len<m-1;buffer_len++,check_len++){
		if(buffer[buffer_len]<=0x39){//第一位为‘0’-‘9’
			WriteBuffer[check_len] = (buffer[buffer_len]-0x30)*16;
			buffer_len++;
			if(buffer[buffer_len]<=0x39){// 第二位'0'-'9'
				WriteBuffer[check_len] += (buffer[buffer_len]-0x30);
//				buffer_len++;
			}else if((buffer[buffer_len]<=0x46)&&(buffer[buffer_len]>=0x41)){//第二位 'A'-'F'
				WriteBuffer[check_len] += (buffer[buffer_len]-0x37);
//				buffer_len++;
			}else if((buffer[buffer_len]<=0x66)&&(buffer[buffer_len]>=0x61)){//'a'-'f'
					WriteBuffer[check_len] += (buffer[buffer_len]-0x57);
//					buffer_len++;
			}
		}
		else if(buffer[buffer_len]>=0x41&&buffer[buffer_len]<=0x46){//第一位 'A'-'F'
				WriteBuffer[check_len] = (buffer[buffer_len]-0x37)*16;
				buffer_len++;
			if(buffer[buffer_len]<=0x39){// 第二位'0'-'9'
				WriteBuffer[check_len] += (buffer[buffer_len]-0x30);
//				buffer_len++;
			}else if((buffer[buffer_len]<=0x46)&&(buffer[buffer_len]>=0x41)){//第二位 'A'-'F'
				WriteBuffer[check_len] += (buffer[buffer_len]-0x37);
//				buffer_len++;
			}else if((buffer[buffer_len]<=0x66)&&(buffer[buffer_len]>=0x61)){//'a'-'f'
					WriteBuffer[check_len] += (buffer[buffer_len]-0x57);
//					buffer_len++;
			}
		}else if((buffer[buffer_len]<=0x66)&&(buffer[buffer_len]>=0x61)){//'a'-'f'
					WriteBuffer[check_len] += (buffer[buffer_len]-0x57)*16;
					buffer_len++;
			if(buffer[buffer_len]<=0x39){// 第二位'0'-'9'
				WriteBuffer[check_len] += (buffer[buffer_len]-0x30);
//				buffer_len++;
			}else if((buffer[buffer_len]<=0x46)&&(buffer[buffer_len]>=0x41)){//第二位 'A'-'F'
				WriteBuffer[check_len] += (buffer[buffer_len]-0x37);
//				buffer_len++;
			}else if((buffer[buffer_len]<=0x66)&&(buffer[buffer_len]>=0x61)){//'a'-'f'
					WriteBuffer[check_len] += (buffer[buffer_len]-0x57);
//					buffer_len++;
			}
		
		}
		
	}

　　上面的程序是将一个字符串转换成数，在ascii编码的时候用到的，用于取得数字，做校验位的 

例：

　　char tmp[20]="ff70603130FF";

　　两位两位的取值 将ff取出转换成16进制或10进制保存到整型数组中。