c ++静态库引用另一个库的链接器错误

Question

我对c ++很新,我在调试链接器错误时遇到问题.我正在使用wxDev-c ++和g ++编译器.我创建了一个静态库,我将其链接到一个基本项目.该库最初不包含对外部头文件或库的引用,它只是一些简单的测试函数,将2个双精度数组合在一起并返回值.这与链接到测试项目时工作正常.但是我现在正试图将FTP合并到该库中,现在我正在收到链接器错误.

目前测试功能只是试图访问相同的简单添加功能进行测试,我甚至没有调用FTP功能,因为我只是想让测试项目正确编译.

库代码:

DaFTPLib.h:

#ifndef WAVE_H
#define WAVE_H
#ifdef __BORLANDC__
#pragma hdrstop
#endif

#ifndef WX_PRECOMP
#include <wx/wx.h>
#else
#include <wx/wxprec.h>
#endif

#include <wx/protocol/ftp.h>

namespace Wave
{
    class DaFTP
    {
        public:
        DaFTP(char *url, char *login, char *password);
        ~DaFTP();
        const int Download(char* fileName);
        static const void DownloadNCWD(char *url, char *fileName, char *login, char *password);
        static const void DownloadLAMP();
        static double FuncA(double a, double b);
        static double FuncB(double a, double b);

        private:
        char* url, login, password;
        wxFTP ftp;
    };
}

#endif

DaFTP.cpp:

#include "DaFTPLib.h"

using namespace std;
char* _url;
char* _login;
char* _password;
wxFTP ftp;

namespace Wave
{
    DaFTP::DaFTP(char *url, char *login, char *password)
    {
       _url = url;
       _login = login;
       _password = password;
    }

    DaFTP::~DaFTP(){}

    const int DaFTP::Download(char *fileName)
    {
        int fileSize;

        ftp.SetPassive(true);
        ftp.SetUser(_login);
        ftp.SetPassword(_password);
        ftp.Connect(_url);

        fileSize = ftp.GetFileSize(fileName);
        return fileSize;
    }

    const void DaFTP::DownloadNCWD(char *url, char *fileName, char *login, char *password)
    {
        DaFTP daftp(url, login, password);
        daftp.Download(fileName);
    }

    const void DaFTP::DownloadLAMP() {}

    double DaFTP::FuncA(double a, double b)
    {
         return a + b;
    }
    double DaFTP::FuncB(double a, double b)
    {
         return a - b;
    }
}

测试项目代码:

#include <cstdlib>
#include <iostream>

#include "../libDaFTP/DaFTPLib.h"

using namespace std;

int main(int argc, char *argv[])
{
    double a, b, c;

    a = 23.32;
    b = 26.68;

    c = Wave::DaFTP::FuncA(a, b);
    cout << "FuncA val: " << c << endl;

    c = Wave::DaFTP::FuncB(a, b);
    cout << "FuncB val: " << c << endl;
    system("PAUSE");
    return EXIT_SUCCESS;
}

库的编译日志输出(编译好):

执行make ... mingw32-make.exe -f"Makefile.win"all g ++.exe -c DaFTPLib.cpp -o Objects/MingW/DaFTPLib.o -I"C:/ Program Files(x86)/ Dev-Cpp /lib/gcc/mingw32/3.4.5/include"-I"C:/ Program Files(x86)/ Dev-Cpp/include/c ++/3.4.5/backward"-I"C:/ Program Files(x86) /Dev-Cpp/include/c++/3.4.5/mingw32"-I"C:/ Program Files(x86)/ Dev-Cpp/include/c ++/3.4.5"-I"C:/ Program Files(x86)/dev-Cpp/include"-I"C:/ Program Files(x86)/ Dev-Cpp /" - I"C:/ Program Files(x86)/ Dev-Cpp/include/common/wx/msw"-I "C:/ Program Files(x86)/ Dev-Cpp/include/common/wx/generic"-I"C:/ Program Files(x86)/ Dev-Cpp/include/common/wx/html"-I"C :/ Program Files(x86)/ Dev-Cpp/include/common/wx/protocol"-I"C:/ Program Files(x86)/ Dev-Cpp/include/common/wx/xml"-I"C:/程序文件(x86)/ Dev-Cpp/include/common/wx/xrc"-I"C:/ Program Files(x86)/ Dev-Cpp/include/common/wx"-I"C:/ Program Files(x86 )/开发-CPP /包含/共同"

ar rcu"Output/MingW/libDaFTP.a""Objects/MingW/DaFTPLib.o"

执行已终止编译成功编译需要1秒钟才能完成

测试项目的编译日志输出(编译失败)

执行make ... mingw32-make.exe -f"Makefile.win"all g ++.exe -c main.cpp -o Objects/MingW/main.o -I"C:/ Program Files(x86)/ Dev-Cpp /lib/gcc/mingw32/3.4.5/include"-I"C:/ Program Files(x86)/ Dev-Cpp/include/c ++/3.4.5/backward"-I"C:/ Program Files(x86) /Dev-Cpp/include/c++/3.4.5/mingw32"-I"C:/ Program Files(x86)/ Dev-Cpp/include/c ++/3.4.5"-I"C:/ Program Files(x86)/dev-Cpp/include"-I"C:/ Program Files(x86)/ Dev-Cpp /" - I"C:/ Program Files(x86)/ Dev-Cpp/include/common/wx/msw"-I "C:/ Program Files(x86)/ Dev-Cpp/include/common/wx/generic"-I"C:/ Program Files(x86)/ Dev-Cpp/include/common/wx/html"-I"C :/ Program Files(x86)/ Dev-Cpp/include/common/wx/protocol"-I"C:/ Program Files(x86)/ Dev-Cpp/include/common/wx/xml"-I"C:/程序文件(x86)/ Dev-Cpp/include/common/wx/xrc"-I"C:/ Program Files(x86)/ Dev-Cpp/include/common/wx"-I"C:/ Program Files(x86 )/开发-CPP /包含/共同"

g ++.exe"Objects/MingW/main.o"-o"Output/MingW/LibTest.exe"-L"C:/ Program Files(x86)/ Dev-Cpp/Lib"../libDaFTP/Output/MingW/ libDaFTP.a

Objects/MingW/main.o:main.cpp :(.rdata $ _ZTV20wxThreadHelperThread [vtable for wxThreadHelperThread] + 0xc):undefined reference to wxThread::TestDestroy()' Objects/MingW/main.o:main.cpp:(.text$_ZN20wxThreadHelperThreadD1Ev[wxThreadHelperThread::~wxThreadHelperThread()]+0x16): undefined reference towxThread :: ~wxThread()'Objects/MingW/main.o:main.cpp :( .text $ _ZN20wxThreadHelperThreadD0Ev [wxThreadHelperThread ::〜wxThreadHelperThread()] + 0x16):未定义引用wxThread::~wxThread()' ../libDaFTP/Output/MingW/libDaFTP.a(DaFTPLib.o):DaFTPLib.cpp:(.text+0x10): undefined reference towxFTP :: wxFTP()'../libDaFTP/Output/MingW/libDaFTP.a(DaFTPLib.o):DaFTPLib.cpp :(的.text + 0x3E的):未定义参照wxFTP::wxFTP()' ../libDaFTP/Output/MingW/libDaFTP.a(DaFTPLib.o):DaFTPLib.cpp:(.text+0x6c): undefined reference towxFTP ::〜wxFTP()" ../libDaFTP/Output/MingW/libDaFTP.a(DaFTPLib.o):DaFTPLib.cpp:(.text+0x82):未定义参照wxFTP::~wxFTP()' ../libDaFTP/Output/MingW/libDaFTP.a(DaFTPLib.o):DaFTPLib.cpp:(.text+0x1e3): undefined reference towxFTP :: Connect(wxString const&wxFTP::GetFileSize(wxString const&)' ../libDaFTP/Output/MingW/libDaFTP.a(DaFTPLib.o):DaFTPLib.cpp:(.text+0x43f): undefined reference to)'../libDaFTP/Output/MingW/libDaFTP.a( DaFTPLib.o):DaFTPLib.cpp:(.text+0x24e):未定义的引用wxFTP :: wxFTP()'../libDaFTP/Output/MingW/libDaFTP.a(DaFTPLib.o):DaFTPLib.cpp :(.text + 0x45a):未定义的对wxStringBase wxFTP::~wxFTP()' ../libDaFTP/Output/MingW/libDaFTP.a(DaFTPLib.o):DaFTPLib.cpp:(.text$_ZN8wxStringaSERKS_[wxString::operator=(wxString const&)]+0x14): undefined reference to:: operator =(wxStringBase const&)'.. :: libDaFTP/Output/MingW/libDaFTP的引用. a(DaFTPLib.o):DaFTPLib.cpp :(.text $ _ZN12wxStringBaseC2EPKc [wxStringBase :: wxStringBase(char const*)] + 0x7):对wxStringBase::npos' ../libDaFTP/Output/MingW/libDaFTP.a(DaFTPLib.o):DaFTPLib.cpp:(.text$_ZN12wxStringBaseC2EPKc[wxStringBase::wxStringBase(char const*)]+0x25): undefined reference towxStringBase :: InitWith的未定义引用 (char const*,unsigned int,unsigned int)'collect2:ld返回1退出状态

mingw32-make.exe:* [输出/ MingW/LibTest.exe]错误1

执行已终止编译失败.返回2

---

我为长篇大论道歉,但希望这足以让有人指出我正确的方向.我假设问题在于合并wx/protocol/ftp库,但我假设在编译我的库时,任何支持库(如ftp的东西)都会用它编译.

Answer 1

但我假设在编译我的库时,任何支持库(如ftp的东西)都会用它编译.

你所说的只适用于动态链接库:如果你构建一个引用其他库的静态库,那么链接到静态库的应用程序或DLL仍然必须链接到其他库.静态库只不过是编译对象代码的集合.库代码中引用的外部功能都没有在被链接.

将您的帮助程序库设为DLL并将其链接到wx库,或将其保持静态并将使用静态库的每个应用程序链接到wx库.