2
我收到了.h file
作为C++程序的一部分。我试过每种方法来链接它,但未定义的引用错误正在发生。我在Ubuntu中使用NetBeans。对函数错误的未定义引用
.h file
包含我正在尝试使用的函数。但编译器无法找到该功能。
这里是fwlib32.h
文件的一个片段,因为它太大而无法插入整个文件:
FWLIBAPI short WINAPI cnc_allclibhndl3(const char *, unsigned short, long, unsigned short *);
FWLIBAPI short WINAPI cnc_upstart3(unsigned short, short, long, long) ;
FWLIBAPI short WINAPI cnc_upstart3_f(unsigned short, short, char *, char *) ;
FWLIBAPI short WINAPI cnc_statinfo(unsigned short, ODBST *) ;
FWLIBAPI short WINAPI cnc_upload3(unsigned short, long *, char *) ;
FWLIBAPI short WINAPI cnc_upend3(unsigned short) ;
FWLIBAPI short WINAPI cnc_freelibhndl(unsigned short) ;
这是我的程序文件:
#include "fwlib32.h"
#include<pthread.h>
#include<stdio.h>
#include<string.h>
#define BUFSIZE 1280
static unsigned short H;
struct conn_data
{
char ip[100];
short prt;
long tmo;
long pnum;
};
void conn(char *ipadd, short port, long tmout)
{
unsigned short h;
short ret;
ODBST buf;
ret = cnc_allclibhndl3(ipadd, port, tmout, &h) ;
if (!ret) {
cnc_statinfo(h, &buf) ;
H=h;
}
else
printf("ERROR!(%d)\n", ret) ;
}
short upld(long prgnum)
{
unsigned short h=H;
char buf[BUFSIZE+1] ;
short ret ;
long len;
ret = cnc_upstart3(h, 0, prgnum, prgnum) ;
if (ret) return (ret) ;
do {
len = BUFSIZE ;
ret = cnc_upload3(h, &len, buf) ;
if (ret == EW_BUFFER) {
continue ;
}
if (ret == EW_OK) {
buf[len] = '\0' ;
printf("%s", buf) ;
}
if (buf[len-1] == '%') {
break ;
}
} while (ret == EW_OK) ;
ret = cnc_upend3(h) ;
return (ret) ;
pthread_exit(&ret);
}
void* start_thread(void * dat)
{
struct conn_data *data;
data = (struct conn_data *)dat;
conn(data->ip, data->prt, data->tmo);
upld(data->pnum);
}
int main()
{
struct conn_data data;
char ip[100];
short prt;
long tmo,pnum;
pthread_t thread1;
int *ptr;
printf("\nEnter the IP address\n");
scanf("%s",ip);
strcpy(data.ip,ip);
printf("\nEnter the port number\n");
scanf("%hd",&prt);
data.prt=prt;
printf("\nEnter the timeout period in seconds\n");
scanf("%ld",&tmo);
data.tmo=tmo;
printf("Enter the program number\n");
scanf("%ld",&pnum);
data.pnum=pnum;
pthread_create(&thread1, NULL, start_thread, (void*)&data);
pthread_join(thread1, (void **) &ptr);
cnc_freelibhndl(H) ;
return 0;
}
,这些都是编译器窗口中的内容在NetBeans中:
"/usr/bin/make" -f nbproject/Makefile-Debug.mk QMAKE= SUBPROJECTS= .clean-conf
make[1]: Entering directory `/home/niketh/NetBeansProjects/AmiT1'
rm -f -r build/Debug
rm -f dist/Debug/GNU-Linux-x86/amit1
make[1]: Leaving directory `/home/niketh/NetBeansProjects/AmiT1'
CLEAN SUCCESSFUL (total time: 56ms)
"/usr/bin/make" -f nbproject/Makefile-Debug.mk QMAKE= SUBPROJECTS= .build-conf
make[1]: Entering directory `/home/niketh/NetBeansProjects/AmiT1'
"/usr/bin/make" -f nbproject/Makefile-Debug.mk dist/Debug/GNU-Linux-x86/amit1
make[2]: Entering directory `/home/niketh/NetBeansProjects/AmiT1'
mkdir -p build/Debug/GNU-Linux-x86
rm -f build/Debug/GNU-Linux-x86/connect.o.d
g++ -c -g -MMD -MP -MF build/Debug/GNU-Linux-x86/connect.o.d -o build/Debug/GNU-Linux-x86/connect.o connect.cpp
mkdir -p dist/Debug/GNU-Linux-x86
g++ -o dist/Debug/GNU-Linux-x86/amit1 build/Debug/GNU-Linux-x86/connect.o -lpthread
build/Debug/GNU-Linux-x86/connect.o: In function `conn(char*, short, long)':
/home/niketh/NetBeansProjects/AmiT1/connect.cpp:22: undefined reference to `cnc_allclibhndl3'
/home/niketh/NetBeansProjects/AmiT1/connect.cpp:24: undefined reference to `cnc_statinfo'
build/Debug/GNU-Linux-x86/connect.o: In function `upld(long)':
/home/niketh/NetBeansProjects/AmiT1/connect.cpp:37: undefined reference to `cnc_upstart3'
/home/niketh/NetBeansProjects/AmiT1/connect.cpp:41: undefined reference to `cnc_upload3'
/home/niketh/NetBeansProjects/AmiT1/connect.cpp:53: undefined reference to `cnc_upend3'
build/Debug/GNU-Linux-x86/connect.o: In function `main':
/home/niketh/NetBeansProjects/AmiT1/connect.cpp:88: undefined reference to `cnc_freelibhndl'
collect2: error: ld returned 1 exit status
make[2]: *** [dist/Debug/GNU-Linux-x86/amit1] Error 1
make[2]: Leaving directory `/home/niketh/NetBeansProjects/AmiT1'
make[1]: *** [.build-conf] Error 2
make[1]: Leaving directory `/home/niketh/NetBeansProjects/AmiT1'
make: *** [.build-impl] Error 2
BUILD FAILED (exit value 2, total time: 220ms)
我查看了其他类似的问题和trie d在项目属性选项中添加库文件,或者仅在g ++语句中创建一个-lfwlib32
选项。他们都没有造成任何改变。该计划将不会建立。谁能帮帮我吗?
实际上,您不会*链接*库,或者您会在链接器命令行上显示'-lfwlib32'。 –
对,你正在使用在h文件中声明的函数,但没有链接一个库,所以链接器不知道从哪里得到实际的实现。您需要链接到实现这些功能的库。 – olegst
使用g ++编译器创建了fwlib32库吗?对于你的程序编译,你正在使用g ++。因此,名称修改(由C++编译器完成)可能是未定义引用问题的原因(如果fwlib32库是使用gcc而不是g ++创建的)。 extern“C”{#include“fwlib32.h”}方法可以用来避免这个问题。 – cm161