编译libcurl android

http://my.oschina.net/zhoulc/blog/111929

http://blog.csdn.net/vrix/article/details/7683212先贴一个博文，不过没成功。。。。

利用源码编译的 ： http://www.tmy13.com/?p=24

加openssl编译的： http://piggyq.com/pen/compile-libcurl-and-openssl-on-android-using-ndk.html

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参考：终于编译成功curl，里面有上篇文章的摘要。

其实就是缺少.configure出的配置文件，但是该文件是通用的，可以提供下载：Here

里面有具体编译方法的说明，这里不具体再细讲了，这不过不是使用ndk-builder,而是ndk-builder.cmd。

测试的话，使用eclipse建立Android工程：

1.新建Android application project,名称叫：curltest，命名空间是：package com.mtterra.curltest，入口Activity是curltest，布局文件是main.xml。

2.把上面压缩包里面的curltest.java拷贝到src，main.xml拷贝到layout，libcurltest.so拷贝到libs\armeabi，jni拷贝到项目root下，

3 AndroidManifest.xml添加访问网络的权限：

<uses-permission android:name=”android.permission.INTERNET”/>

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利用android-ndk编译libcurl动态库：

1 建立目录 android-ndk/apps/curljni/

2 在curljni中建立Application.mk文件 和project文件夹

#Application.mk
APP_PROJECT_PATH := $(call my-dir)/project
APP_MODULES := curljni libcurl

 

3 /project/jni

jni文件夹中 建立Android.mk，放入curl源码和curljni.c 文件。

#Android.mk

LOCAL_PATH:= $(call my-dir)

CFLAGS := -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 -DHAVE_CONFIG_H

include $(CLEAR_VARS)
include $(LOCAL_PATH)/curl/lib/Makefile.inc


LOCAL_SRC_FILES := $(addprefix curl/lib/,$(CSOURCES))
LOCAL_CFLAGS += $(CFLAGS)
LOCAL_C_INCLUDES += $(LOCAL_PATH)/curl/include/ $(LOCAL_PATH)/curl/lib

LOCAL_COPY_HEADERS_TO := libcurl
LOCAL_COPY_HEADERS := $(addprefix curl/include/curl/,$(HHEADERS))

LOCAL_MODULE:= libcurl

include $(BUILD_STATIC_LIBRARY)

# Build shared library now
# curltest

include $(CLEAR_VARS)

LOCAL_MODULE := curljni
LOCAL_SRC_FILES := curljni.c
LOCAL_STATIC_LIBRARIES := libcurl
LOCAL_C_INCLUDES += $(LOCAL_PATH)/curl/include $(LOCAL_PATH)/curl/lib
include $(BUILD_SHARED_LIBRARY) 

//curljni.c

#include <string.h>
#include <jni.h>
#include <stdio.h>
#include <stdlib.h>
#include "curl_config.h"
#include "curl/curl.h"

typedef struct pageInfo_t {
  char *data;
  int  len;
} pageInfo_t;

static size_t
HTTPData(void *buffer, size_t size, size_t nmemb, void *userData) {
  int len = size * nmemb;
  pageInfo_t *page = (pageInfo_t *)userData;


  if (buffer && page->data && (page->len + len < (16 * 1024)) ) {
    memcpy(&page->data[page->len], buffer, len);
    page->len += len;
  }
  return len;
}

   //Inteface funciton that will recieve web page fom Java jstring
Java_com_curljni_curljni_JNIGetWebpage( JNIEnv* env, jobject entryObject, jstring webpageJStr )
{
  pageInfo_t page;
  CURL *curl;
  CURLcode res;
  char *buffer;

  const jbyte *webpage;
  webpage = (*env)->GetStringUTFChars(env, webpageJStr, NULL);
  if (webpage == NULL) {
      return NULL; /* OutOfMemoryError already thrown */
  }

  page.data = (char *)malloc(16 * 1024);
  page.len = 0;
  if (page.data)
    memset(page.data, 32, 16 * 1024);

  buffer = (char *)malloc(1024);

  curl = curl_easy_init();
  if(curl) {
    curl_easy_setopt(curl, CURLOPT_URL, webpage);
    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, HTTPData);
    curl_easy_setopt(curl, CURLOPT_WRITEDATA, &page);

    res = curl_easy_perform(curl);
        /* always cleanup */
    curl_easy_cleanup(curl);
    (*env)->ReleaseStringUTFChars(env, webpageJStr, webpage);
    if(res == 0) {
      if (buffer) {
        page.data[page.len < 256 ? page.len : 256] = '\0';
    sprintf(buffer, "pagedata(%d): %s. done.\n", page.len, page.data);
        return (*env)->NewStringUTF(env, buffer);
      }
    }
    sprintf(buffer, "Result error:%d", res);
    return (*env)->NewStringUTF(env, buffer);
   } else {
      return (*env)->NewStringUTF(env, "Unable to init cURL");
   }
} 

4 在android-ndk目录中 执行 make APP=curljni -B

在project/libs/armeabi/生成 libcurljni.so 文件。

5 建立测试工程的时候注意命名。android:name="com.curljni.curljni"

 

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Summary of the steps to take for this port:

  - Lots of searches and view the current state of curl porting

  - Setup source repository (I used Linux, you could try windows using cygwin) 

  - Create curl_config.h under the full android source tree

  - Untar curltest.tar.gz under $NDKROOT or Create NDK JNI App on Windows

  - Cross-link or add to eclipse project to build Java front-end

  - Unpack cURL into $NDKROOT/apps/curltest/jni/curl

  - Copy curltest/jni/curlbuild.h to curltest/jni/curl/include/curl

  - Copy curltest/jni/curl_config.h to curltest/jni/curl/lib

  - Build and test 

 

我的总结：

编译curl时最麻烦又容易出错的是.configure，其实它的输出只是个curl_config.h文件。可以从别处拿来。第二个麻烦的地方是 Android.mk的编写。有幸的上文有给出。作者打了个包在这里：http://mtterra.com/files /curltest.tar.gz

 

实践证明，有了这2个文件，libcurl是可以在cygwin+ndk的环境下编出来的。不过本文不是用我常用的ndk-build来编的，而是把目录放在ndk/apps目录下。用 make APP=curltest -B V=1 方式来编译.刚才试了一下。用$NDK/ndk-build -B V=1也可以编成功。（前提是用make方式编译过一遍，大概是由于有些文件要用make生成一次。）