Question

我正在尝试在Android nexus-7 wifi平板电脑上运行packetspammer应用程序（代号：grouper）。我下载了libpcap库，并能够生成静态库（libpcap.a）。但是，当我尝试使用NDK-build构建packetspammer应用程序时，我不断收到链接器错误。

我的文件夹结构如下所示：

packetspammer
|
jni
  |
  packetspammer source files
  Android.mk file that links in libpcap and builds the packetspammer binary
  <Directory>platform_external_libpcap 
       |
       libpcap.a file

这是我的android.mk文件：

#Links the libpcap library
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE    := platform_external_libpcap/libpcap
LOCAL_SRC_FILES := platform_external_libpcap/libpcap.a
LOCAL_EXPORT_C_INCLUDES := platform_external_libpcap
include $(PREBUILT_STATIC_LIBRARY)

#Builds packetspammer app
include $(call all-subdir-makefiles)
include $(CLEAR_VARS)

LOCAL_MODULE    := packetspammer
LOCAL_SRC_FILES := radiotap.c packetspammer.c 
LOCAL_STATIC_LIBRARIES  := platform_external_libpcap/libpcap.a
LOCAL_C_INCLUDES := ~/android/android-ndk-r10b/platforms/android-L/arch-arm/usr/include \
                ~/packetspammer/jni/platform_external_libpcap

TARGET_ARCH     := arm

include $(BUILD_SHARED_LIBRARY)

这些是我收到的错误消息：

error: undefined reference to 'pcap_open_live'
error: undefined reference to 'pcap_datalink'
error: undefined reference to 'pcap_compile'
error: undefined reference to 'pcap_geterr'
error: undefined reference to 'pcap_setfilter'
error: undefined reference to 'pcap_geterr'
error: undefined reference to 'pcap_freecode'
error: undefined reference to 'pcap_setnonblock'
error: undefined reference to 'pcap_next_ex'
error: undefined reference to 'pcap_inject'

你能告诉我Android.mk文件或我遵循的流程有什么问题吗？我查看了NDK程序员指南，并按照＆＃34; Building / Standalone工具链＆＃34;部分进行了操作。以及＆＃34; Building / Android.mk＆＃34;。即使使用独立工具链，我也会遇到相同的链接器错误。

在我被困在这里之前，我发现很多帖子帮我解决了几个错误。以下是这些链接：

undefined reference error while statically linking;

linking third party libs;

trouble linking static libraries;

using a pre-compiled static library;

libpcap for android;

compile libpcap using android ndk

porting JNetPcap

Answer 1

我能够解决这个问题。我按照this SO question (compile libpcap using android ndk)中接受的答案，从this site下载了libpcap。

我编译并构建了libpcap.a静态库，将其链接到packetspammer android.mk文件并获得最终的可执行文件。

Android NDK-build中的libpcap静态链接错误（对pcap API的未定义引用）

1 个答案: