Windows上面编译和简单测试一下leveldb-1.9.0

最新推荐文章于 2025-05-17 16:08:31 发布

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最新推荐文章于 2025-05-17 16:08:31 发布

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本文介绍如何在Windows平台上编译LevelDB，并提供了一个简单的测试案例。文章详细记录了解决过程中遇到的问题及解决方法，包括配置环境、修复头文件等步骤。

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http://gmd20.blog.163.com/blog/static/1684392320131733835919/

已经port到windows 平台了，不过在官网下载的源码包是不能直接编译的

https://code.google.com/p/leveldb/downloads/list

官方的git 里面有windows的分支，不过很遗憾，由于我们伟大的防火墙，git clone不下来。不过看在线的源码，应该里面的源码也是不完整的。

不过那个分支下面有个Windows的编译文档的说明 https://code.google.com/p/leveldb/source/browse/WINDOWS?name=windows

1. 在vc里面创建动态链接库工程，指定已经存在的目录，直接把leveldb的源文件导入项目里面。

2. 配置 boost 和 leveldb的include目录

3. 添加预定义宏， LEVELDB_PLATFORM_WINDOWS 和 OS_WIN

4. 到官方的 windows 分支，和这里 http://code.google.com/r/kkowalczyk-leveldb/source/browse/#git%2Fwin 找到下面这些文件，添加到 leveldb的目录和工程里面去。

utill/env_win.cc

util/win_logger.h

utl/win_logger.cc

port/port_win.h

port/port_win.cc

修改

port.h

加上 Windows平台的头文件 port/port_win.h

// Copyright (c) 2011 The LevelDB Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. See the AUTHORS file for names of contributors. #ifndef STORAGE_LEVELDB_PORT_PORT_H_ #define STORAGE_LEVELDB_PORT_PORT_H_ #include <string.h> // Include the appropriate platform specific file below. If you are // porting to a new platform, see "port_example.h" for documentation // of what the new port_<platform>.h file must provide. #if defined(LEVELDB_PLATFORM_POSIX) # include "port/port_posix.h" #elif defined(LEVELDB_PLATFORM_CHROMIUM) # include "port/port_chromium.h" #elif defined(LEVELDB_PLATFORM_WINDOWS) # include "port/port_win.h" #endif #endif // STORAGE_LEVELDB_PORT_PORT_H_

参考 port_posix.h 修改。

port/port_win.h

port/port_win.cc

加上 InitOnce 的声明和定义

// Thread-safe initialization.
// Used as follows:
// static port::OnceType init_control = LEVELDB_ONCE_INIT;
// static void Initializer() { ... do something ...; }
// ...
// port::InitOnce(&init_control, &Initializer);
typedef long OnceType;
#define LEVELDB_ONCE_INIT 0
extern void InitOnce(port::OnceType*, void (*initializer)());
//----------------cpp-----------------------------------
 void InitOnce(OnceType* once, void (*initializer)()) {

if (InterlockedCompareExchange (once, 1,0) == 0 ) {
initializer();
}
}

5. 修复头文件包含的错误 unistd.h

#ifdef WIN32
#include <io.h>
#include <process.h>
#else
#include <unistd.h>
#endif

6. 从项目里面移除所有 xxx_text.c c xxxx_bench.cc 测试和性能测试相关源文件。

7. 从 http://code.google.com/r/kkowalczyk-leveldb/source/browse/#git%2Fwin 复制dll导出符号定义文件。

工程属性 -》 linker -》 input -》 module definition file指定导出符号文件。

LIBRARY libleveldb EXPORTS ; db operations leveldb_open leveldb_close leveldb_put leveldb_delete leveldb_write leveldb_get leveldb_create_iterator leveldb_create_snapshot leveldb_release_snapshot leveldb_property_value leveldb_approximate_sizes ; management leveldb_destroy_db leveldb_repair_db ; iterator leveldb_iter_destroy leveldb_iter_valid leveldb_iter_seek_to_first leveldb_iter_seek_to_last leveldb_iter_seek leveldb_iter_next leveldb_iter_prev leveldb_iter_key leveldb_iter_value leveldb_iter_get_error ; write batch leveldb_writebatch_create leveldb_writebatch_destroy leveldb_writebatch_clear leveldb_writebatch_put leveldb_writebatch_delete leveldb_writebatch_iterate ; options leveldb_options_create leveldb_options_destroy leveldb_options_set_comparator leveldb_options_set_create_if_missing leveldb_options_set_error_if_exists leveldb_options_set_paranoid_checks leveldb_options_set_env leveldb_options_set_info_log leveldb_options_set_write_buffer_size leveldb_options_set_max_open_files leveldb_options_set_cache leveldb_options_set_block_size leveldb_options_set_block_restart_interval ; compression leveldb_options_set_compression ; comparator leveldb_comparator_create leveldb_comparator_destroy ; read options leveldb_readoptions_create leveldb_readoptions_destroy leveldb_readoptions_set_verify_checksums leveldb_readoptions_set_fill_cache leveldb_readoptions_set_snapshot ; write options leveldb_writeoptions_create leveldb_writeoptions_destroy leveldb_writeoptions_set_sync ; cache leveldb_cache_create_lru leveldb_cache_destroy ; env leveldb_create_default_env leveldb_env_destroy ; misc leveldb_free

编译得到 dll和lib文件，根据源码目录下 c_test.cc 写个简单的测试。

#include "leveldb/c.h"



  leveldb_t* db;
  leveldb_comparator_t* cmp;
  leveldb_cache_t* cache;
  leveldb_env_t* env;
  leveldb_options_t* options;
  leveldb_readoptions_t* roptions;
  leveldb_writeoptions_t* woptions;
  char* err = NULL;


  env = leveldb_create_default_env();
  cache = leveldb_cache_create_lru(100000);

  options = leveldb_options_create();
 // leveldb_options_set_comparator(options, cmp);
  //leveldb_options_set_error_if_exists(options, 1);
  //leveldb_options_set_cache(options, cache);
  //leveldb_options_set_env(options, env);
  //leveldb_options_set_info_log(options, NULL);
  //leveldb_options_set_write_buffer_size(options, 100000);
  //leveldb_options_set_paranoid_checks(options, 1);
  //leveldb_options_set_max_open_files(options, 10);
  //leveldb_options_set_block_size(options, 1024);
  //leveldb_options_set_block_restart_interval(options, 8);
  leveldb_options_set_compression(options, leveldb_no_compression);

  //roptions = leveldb_readoptions_create();
  //leveldb_readoptions_set_verify_checksums(roptions, 1);
  //leveldb_readoptions_set_fill_cache(roptions, 0);
 

  woptions = leveldb_writeoptions_create();
  //leveldb_writeoptions_set_sync(woptions, 1);  //同步写非常慢
  leveldb_writeoptions_set_sync(woptions, 0);

  leveldb_destroy_db(options, "D:/Trace/test.db" , &err);
     
  leveldb_options_set_create_if_missing(options, 1);
  db = leveldb_open(options, "D:/Trace/test.db", &err);
   

    
  leveldb_put(db, woptions, "foo", 3, "hello", 5, &err);
  //leveldb_writebatch_t* wb = leveldb_writebatch_create();
  //leveldb_writebatch_put(wb, "foo", 3, "a", 1);
  //leveldb_writebatch_clear(wb);
  //leveldb_writebatch_put(wb, "bar", 3, "b", 1);
  //leveldb_writebatch_put(wb, "box", 3, "c", 1);
  //leveldb_writebatch_delete(wb, "bar", 3);
  //leveldb_write(db, woptions, wb, &err);



  char data [200];
  char key[64];

 QueryPerformanceCounter(&t0);
 unsigned long   last_time = GetTickCount();
 unsigned long    max_time =0;

 int i, j;
 for (i=0; i< 5000000; i++) {
     //UpdateTimeString(date,64);
  itoa(i, key,10);
  leveldb_put(db, woptions,key,strlen(key) , data, 200, &err);

 unsigned long   time = GetTickCount(); 
 unsigned long   max = time - last_time;
 last_time = time;
 if (max > max_time) {
  max_time = max;
 }
 }

 QueryPerformanceCounter(&t1);

 std::cout << "最大耗时 " << max_time << " 毫秒" << endl;
 unsigned long time = (((t1.QuadPart-t0.QuadPart)*1000000)/freq.QuadPart);
 std::cout  << "执行 " << i <<" 次， 耗时 " << time <<  " 微秒" << std::endl;