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解析libcurl在android下的移植、编译与测试

  • 时间:2020-08-26 22:01 编辑: 来源: 阅读:
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摘要:解析libcurl在android下的移植、编译与测试
由于项目需要在NDK中使用网络开发,对于c语言网络开发来说,libcurl库是个很不错的选择,但android系统中并没有自带该库,所以就得自己移植了。 [b]下面是移植步骤: 1.  下载curl源码 [/b]我这里下载的是curl-7.22.0,源码下载地址为:http://curl.haxx.se/download.html [b] 2. 准备android源码编译环境, [/b]android源码应已全部编译过,具体细节这里不详述,我这里使用的是android2.2 froyo源码树。 [b]3.  在android中编译curl [/b]在最新的curl源码里其实已经带有Android.mk这个编译文件了,而且在这文件的开头注释部分比较详细地介绍编译方法。 [b]1)拷贝curl源码至android源码树下的external/curl 2)cd 到 external/curl目录下,输入(红色字部分根据自己的环境做相应的更改): [/b]
[u]复制代码[/u] 代码如下:
ANDROID_HOME=/home/braincol/workspace/android/froyo && \ NDK_HOME=/home/braincol/workspace/android/froyo/ndk && \ PATH="$ANDROID_HOME/prebuilt/linux-x86/toolchain/arm-eabi-4.4.0/bin:$PATH" \ ./configure --host=arm-linux CC=arm-eabi-gcc --with-random=/dev/urandom \ CPPFLAGS="-I$NDK_HOME/platforms/android-8/arch-arm/usr/include \ -I $ANDROID_HOME/external/curl/include/  \ -I $ANDROID_HOME/external/curl/3rd/include   \ -I $ANDROID_HOME/external/curl   \ -I $ANDROID_HOME/out/target/product/generic/obj/STATIC_LIBRARIES/libcurl_intermediates   \ -I $ANDROID_HOME/dalvik/libnativehelper/include/nativehelper   \ -I $ANDROID_HOME/system/core/include   \ -I $ANDROID_HOME/hardware/libhardware/include   \ -I $ANDROID_HOME/hardware/libhardware_legacy/include   \ -I $ANDROID_HOME/hardware/ril/include   \ -I $ANDROID_HOME/dalvik/libnativehelper/include   \ -I $ANDROID_HOME/frameworks/base/include   \ -I $ANDROID_HOME/frameworks/base/opengl/include   \ -I $ANDROID_HOME/frameworks/base/native/include   \ -I $ANDROID_HOME/external/skia/include   \ -I $ANDROID_HOME/out/target/product/generic/obj/include   \ -I $ANDROID_HOME/bionic/libc/arch-arm/include   \ -I $ANDROID_HOME/bionic/libc/include   \ -I $ANDROID_HOME/bionic/libstdc++/include   \ -I $ANDROID_HOME/bionic/libc/kernel/common   \ -I $ANDROID_HOME/bionic/libc/kernel/arch-arm   \ -I $ANDROID_HOME/bionic/libm/include   \ -I $ANDROID_HOME/bionic/libm/include/arch/arm   \ -I $ANDROID_HOME/bionic/libthread_db/include \ -include $ANDROID_HOME/system/core/include/arch/linux-arm/AndroidConfig.h \ -I $ANDROID_HOME/system/core/include/arch/linux-arm/ \ -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__ -DANDROID -DNDEBUG -DNDEBUG -DHAVE_CONFIG_H" \ CFLAGS="-fno-exceptions -Wno-multichar -msoft-float -fpic -ffunction-sections \ -funwind-tables -fstack-protector -Wa,--noexecstack -Werror=format-security \ -fno-short-enums -march=armv5te -mtune=xscale  -Wno-psabi -mthumb-interwork  \ -fmessage-length=0 -W -Wall -Wno-unused -Winit-self -Wpointer-arith \ -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point  \ -g -Wstrict-aliasing=2 -finline-functions -fno-inline-functions-called-once \ -fgcse-after-reload -frerun-cse-after-loop -frename-registers  -UDEBUG \ -mthumb -Os -fomit-frame-pointer -fno-strict-aliasing -finline-limit=64   \ -Wpointer-arith -Wwrite-strings -Wunused -Winline -Wnested-externs \ -Wmissing-declarations -Wmissing-prototypes -Wno-long-long -Wfloat-equal \ -Wno-multichar -Wsign-compare -Wno-format-nonliteral -Wendif-labels \ -Wstrict-prototypes -Wdeclaration-after-statement -Wno-system-headers"  \ LIBS="-nostdlib -Bdynamic -Wl,-T,$ANDROID_HOME/build/core/armelf.x \ -Wl,-dynamic-linker,/system/bin/linker -Wl,--gc-sections -Wl,-z,nocopyreloc \ -L$ANDROID_HOME/out/target/product/generic/obj/lib -Wl,-z,noexecstack \ -Wl,-rpath-link=$ANDROID_HOME/out/target/product/generic/obj/lib \ -lc -llog -lcutils -lstdc++ \ -Wl,--no-undefined $ANDROID_HOME/prebuilt/linux-x86/toolchain/arm-eabi-4.4.0/lib/gcc/arm-eabi/4.4.0/libgcc.a  \ $ANDROID_HOME/out/target/product/generic/obj/lib/crtend_android.o \ -lm $ANDROID_HOME/out/target/product/generic/obj/lib/crtbegin_dynamic.o \ -L$ANDROID_HOME/external/curl/3rd/libs"
如果$ANDROID_HOME目录下没有ndk的开发包,那么到google的官网上下载一个放进去就行了。 [b]3)cd 到源码根目录 mmm extern/libcurl: [/b]编译完成之后,会生成静态库:out/target/product/generic/obj/STATIC_LIBRARIES/libcurl_intermediates/libcurl.a  。 [b]4)如果要生成动态库需要修改curl下的Android.mk : [/b]
[u]复制代码[/u] 代码如下:
LOCAL_PRELINK_MODULE := false LOCAL_MODULE:= libcurl LOCAL_MODULE_TAGS := optional # Copy the licence to a place where Android will find it. # Actually, this doesn't quite work because the build system searches # for NOTICE files before it gets to this point, so it will only be seen # on subsequent builds. ALL_PREBUILT += $(LOCAL_PATH)/NOTICE $(LOCAL_PATH)/NOTICE: $(LOCAL_PATH)/COPYING | $(ACP) $(copy-file-to-target) #include $(BUILD_STATIC_LIBRARY) include $(BUILD_SHARED_LIBRARY)
[b]4.  在android中测试curl 1)在android froyo源码树中下建立一个mytest目录,该目录下再建立一个curltest目录。 2)在目录curtest下创建curl-test.cpp: [/b]
[u]复制代码[/u] 代码如下:
#include  "curl/curl.h"#include  <stdio.h>;int main() {     CURL  *curl;     CURLcode  res;     curl_global_init(CURL_GLOBAL_ALL);     curl  = curl_easy_init();    if (curl) {             curl_easy_setopt(curl,  CURLOPT_URL, "http://www.cnblogs.com/hibraincol/");         res  = curl_easy_perform(curl);         if (0!=res) {                  printf("curl  error: %d\n",  res);                 }                 curl_easy_cleanup(curl);        }       curl_global_cleanup();    return 0;}
[b]3)在目录curtest下创建Android.mk: [/b]
[u]复制代码[/u] 代码如下:
#  curl test executable#LOCAL_PATH  := $(call my-dir)include  $(CLEAR_VARS) LOCAL_C_INCLUDES  += \    $(LOCAL_PATH)/3rd/include LOCAL_SRC_FILES:=  curl-test.cpp #  No shared libraries.LOCAL_SHARED_LIBRARIES  := #  No static libraries.LOCAL_STATIC_LIBRARIES  := libcurl LOCAL_MODULE  := curl-testinclude  $(BUILD_EXECUTABLE)
[b]4)把libcurl的头文件拷贝到curtest目录下的3rd/include目录下: [/b]cp -rf out/target/product/generic/obj/include/libcurl/curl  mytest/curltest/3rd/include [b]5)到android源码树的根目录下:mmm /mytest/curltest/ [/b]
[u]复制代码[/u] 代码如下:
braincol@ubuntu:~/workspace/android/froyo$ mmm mytest/curltest/ ============================================ PLATFORM_VERSION_CODENAME=REL PLATFORM_VERSION=2.2 TARGET_PRODUCT=generic TARGET_BUILD_VARIANT=eng TARGET_SIMULATOR= TARGET_BUILD_TYPE=release TARGET_BUILD_APPS= TARGET_ARCH=arm HOST_ARCH=x86 HOST_OS=linux HOST_BUILD_TYPE=release BUILD_ID=MASTER ============================================ make: Entering directory `/home/braincol/workspace/android/froyo' target thumb C++: curl-test <= mytest/curltest/curl-test.cpp mytest/curltest/curl-test.cpp:2:19: warning: extra tokens at end of #include directive target Executable: curl-test (out/target/product/generic/obj/EXECUTABLES/curl-test_intermediates/LINKED/curl-test) target Non-prelinked: curl-test (out/target/product/generic/symbols/system/bin/curl-test) target Strip: curl-test (out/target/product/generic/obj/EXECUTABLES/curl-test_intermediates/curl-test) Install: out/target/product/generic/system/bin/curl-test make: Leaving directory `/home/braincol/workspace/android/froyo'
可以看到在out/target/product/generic/system/bin/下生成了curl-test这个测试程序。 [b]6)将curl-test拷贝到真机或者模拟器中运行。 [/b]  a.我这里是在android真机的根目录下建立了一个test目录.   b.然后通过adb push将curl-test拷贝到该目录下,并更改curl-test为可执行权限:chmod 777 curl-test.   c. adb shell 进入shell控制台,然后cd到test目录下, ./curl-test  执行,可以看到打印出的网页源码,移植成功。   这样在之后的android app开发中,如果需要用到libcurl的库,就可以直接out/target/product/generic/obj/include/libcurl/curl里的头文件和out/target/product/generic/obj/STATIC_LIBRARIES/libcurl_intermediates/libcurl.a拿到app工程中去用就行了。
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