我正在学习 C++,在我现在正在做的一项任务中,我收到了一堆警告,我怀疑这些警告也导致了我遇到的两个错误。问题是出现警告的行是他给我们的行(其中之一),所以我认为代码必须是正确的。这让我相信我的类声明或构造函数中存在问题。任何人都可以发现任何问题吗?
警告(对于 fillSystemCommandList 函数的每一行)是 Convert from string literal to 'char *' is deprecated
并且错误是体系结构 x86_64 的未定义符号: “COMMAND::COMMAND(char*, int)”,引用自: system_utilities.o 中的 fillSystemCommandList() ld:未找到体系结构 x86_64 clang 的符号:错误:链接器命令退出代码 1 失败(使用 -v 查看调用)
您可能可以跳过 ParseCommandLine 函数,我认为这一切都很好。我只是将它包括在内,以便我可以拥有整个文件(这不是我的主要顺便说一句。)
其他注意事项:-systemCommands 数组应该是长度为 NUMBER_OF_COMMANDS 的 COMMAND 指针(我认为我做对了)
- fillSystemCommandList 函数应该使用包含指向命令字符串的指针和相应定义的常量的结构填充 systemCommands 数组。
- 我知道这段代码几乎都是 C,这又是因为我正在学习的课程是 C++ 初级课程。
#include "system_utilities.h"
#include "definitions.h"
using namespace std;
int getCommandNumber(char *s);
class COMMAND {
char* pointertochar;
int* pointertoint;
public:
COMMAND(char*, int);
int amIThisCommand(char*);
};
int COMMAND::amIThisCommand(char* command){
return 0;
}
COMMAND* systemCommands[NUMBER_OF_COMMANDS];
int parseCommandLine(char cline[], char *tklist[]){
int i;
int length; //length of line
int count = 0; //counts number of tokens
int toklength = 0; //counts the length of each token
length = strlen(cline);
for (i=0; i < length; i++) { //go to first character of each token
if (((cline[i] != ' ' && cline[i-1]==' ') || i == 0)&& cline[i]!= '"') {
while ((cline[i]!=' ')&& (cline[i] != '\0') && (cline[i] != '\r')){
toklength++;
i++;
}
//---------------
tklist[count] = (char *) malloc( toklength +1);
memcpy(tklist[count], &cline[i-toklength], toklength);
tklist[count][toklength]='\0';
//cout << "\n" << tklist[count] << "\n";
//cout << "\n" << i << "\n";
//cout << "\n" << toklength << "\n";
//--------------
count ++;
toklength = 0;
}
if (cline[i] == '"') {
do {
toklength++;
i++;
/*if (cline[i] == ' ') {
toklength--;
}*/
} while (cline[i]!='"');
//--------------
tklist[count] = (char *) malloc( toklength +1);
memcpy(tklist[count], &cline[i-toklength+1], toklength-1);
tklist[count][toklength]='\0';
//cout << "\n" << tklist[count] << "\n";
//cout << "\n" << i << "\n";
//cout << "\n" << toklength << "\n";
//--------------
count ++;
toklength = 0;
}
}
return count;
}
int getCommandNumber(char *s) {
/*switch (*s) {
// case "halt":
return HALT;
break;
default:
break;
}*/
return 0;
}
void fillSystemCommandList() {
systemCommands[0] = new COMMAND("halt", HALT);
systemCommands[1] = new COMMAND("status", STATUS);
systemCommands[2] = new COMMAND("time_click", TIME_CLICK);
systemCommands[3] = new COMMAND("new_sensor", NEW_SENSOR);
systemCommands[4] = new COMMAND("new_sensor_node", NEW_SENSOR_NODE);
systemCommands[5] = new COMMAND("new_network", NEW_NETWORK);
systemCommands[6] = new COMMAND("add_sensor_to_node", ADD_SENSOR_TO_NODE);
systemCommands[7] = new COMMAND("add_node_to_network", ADD_NODE_TO_NETWORK);
systemCommands[8] = new COMMAND("sensor_command", SENSOR_COMMAND);
}
再次感谢您提供的任何帮助!