Question

我使用

构建一个共享库

 arm-linux-gnueabi-g++ -Wall -fPIC -c -I../../../onvifgen -I. *.cpp -include openssl/all.h -fpermissive -DWITH_OPENSSL
 arm-linux-gnueabi-g++ -shared -fPIC -Wl,-soname,libonvif.so.1 -o libonvif.so.1.0   *.o
 ln -sf libonvif.so.1.0 libonvif.so.1
 ln -sf libonvif.so.1.0 libonvif.so

当我尝试使用该库时，我得到了很多

 ../../../../binaries/lib/libonvif.so: undefined reference to

这是我使用的命令

 arm-linux-gnueabi-g++ -I../../../../binaries/include -I../../../include -fpermissive -include ../../../../binaries/include/openssl/all.h -w -o test1 onvifclient.cpp -L../../../../binaries/lib -lonvif -lssl -lcrypto -lpthread -DWITH_OPENSSL

如命令所示-lonvif在输入文件onvifclient.cpp之后，链接器应该找到它。

使用来自相同目标文件的静态库.o工作，链接器生成可执行文件。

我在SO上找到的所有答案都与订购有关。

有关错误的更多信息：

../../../../binaries/lib/libonvif.so: undefined reference to `ReceiverBindingService::CreateReceiver(_trv__CreateReceiver*, _trv__CreateReceiverResponse*)'
../../../../binaries/lib/libonvif.so: undefined reference to `PullPointSubscriptionBindingService::PullMessages(_tev__PullMessages*, _tev__PullMessagesResponse*)'
../../../../binaries/lib/libonvif.so: undefined reference to `ReceiverBindingService::GetReceiver(_trv__GetReceiver*, _trv__GetReceiverResponse*)'
../../../../binaries/lib/libonvif.so: undefined reference to `RecordingBindingService::GetRecordingJobState(_trc__GetRecordingJobState*, _trc__GetRecordingJobStateResponse*)'
../../../../binaries/lib/libonvif.so: undefined reference to `PullPointSubscriptionBindingService::Renew_(_wsnt__Renew*, _wsnt__RenewResponse*)'
../../../../binaries/lib/libonvif.so: undefined reference to `MediaBindingService::GetVideoEncoderConfigurations(_trt__GetVideoEncoderConfigurations*, _trt__GetVideoEncoderConfigurationsResponse*)'
../../../../binaries/lib/libonvif.so: undefined reference to `wsddService::Resolve(wsdd__ResolveType*)'
../../../../binaries/lib/libonvif.so: undefined reference to `MediaBindingService::GetAudioDecoderConfiguration_(_trt__GetAudioDecoderConfiguration*, _trt__GetAudioDecoderConfigurationResponse*)'
+ 100+ more errors but other functions.

所有这些功能都可以在cpp文件中找到并定义正确。

使用nm libonvif.so -C| grep MediaBindingService::GetVideoEncoderConfigurations

我得到了结果。

     U MediaBindingService::GetVideoEncoderConfigurations(_trt__GetVideoEncoderConfigurations*, _trt__GetVideoEncoderConfigurationsResponse*)
     U MediaBindingService::GetVideoEncoderConfigurations_(_trt__GetVideoEncoderConfigurations*, _trt__GetVideoEncoderConfigurationsResponse*)

MediaBindingService::GetVideoEncoderConfigurations是在类中定义的纯虚函数：

virtual int GetVideoEncoderConfigurations(_trt__GetVideoEncoderConfigurations *trt__GetVideoEncoderConfigurations, _trt__GetVideoEncoderConfigurationsResponse *trt__GetVideoEncoderConfigurationsResponse) =0;

Answer 1

制作共享库的过程是正确的。问题是我没有身体的功能。解决了将虚拟函数变为纯虚拟的问题。

q.handle

而不是

 virtual void function_name() = 0;

静态库允许没有正文的函数;共享库没有。

创建共享库链接器对

1 个答案: