conan入门(七):将自己的项目生成conan包

git clone https://gitee.com/l0km/conan_example.git -b jsonlib
# -b jsonlib 切换到 jsonlib 分支,等价于 'git checkout jsonlib' 命令 

/*
 * jsonlib.h
 *  conan example for library
 *  Created on: 2022/02/18
 *      Author: guyadong
 */

#ifndef SRC_JSONLIB_H_
#define SRC_JSONLIB_H_
#ifndef JSONLIB_DLL_DECL
#  if defined(_WIN32) && !defined(__CYGWIN__) && defined(JSONLIB_IS_DLL)
#    if defined(JSONLIB_EXPORTS)
#      define JSONLIB_DLL_DECL  __declspec(dllexport)
#    else
#      define JSONLIB_DLL_DECL  __declspec(dllimport)
#    endif
#  else
#    define JSONLIB_DLL_DECL
#  endif
#endif
#include <stddef.h>
#ifdef __cplusplus
extern "C"
{
#endif

//************************************
// 从JSON字符串中解析name指定的字段内容,结果保存到输出缓冲区
// @param    const char * cjs JSON 字符串
// @param    const char * name 字段名
// @param    char * buffer [out] 输出缓冲区
// @param    size_t bufsz 输出缓冲区长度
// @return   int 成功返回0,否则返回-1
//************************************
JSONLIB_DLL_DECL int jlib_parse_field(const char* cjs,const char*name, char*buffer,size_t bufsz);
#ifdef __cplusplus
}
#endif
#endif /* SRC_JSONLIB_H_ */

#include "jsonlib.h"
#include <cjson/cJSON.h>
#include <string.h>
#include <stdlib.h>

JSONLIB_DLL_DECL int jlib_parse_field(const char* cjs,const char*name, char*buffer,size_t bufsz)
{
    int c = -1;
    if(cjs && name && buffer && bufsz)
    {
        cJSON* j = cJSON_Parse(cjs);
        if(j)
        {
            cJSON* item = cJSON_GetObjectItem(j,name);
            if(item)
            {
                char* s = cJSON_PrintUnformatted(item);
                if(s && strlen(s) < bufsz)
                {
					strncpy(buffer, s, bufsz);
					c = 0;
                }
                free(s);
            }
        }
        cJSON_Delete(j);
    }
    return c;
}

cmake_minimum_required(VERSION 3.10.3)
# 3.0以上版本才允许使用VERSION option
project(JsonTest VERSION 1.0.0 LANGUAGES C)
find_package(cJSON REQUIRED)
add_library(jsonlib src/jsonlib.c)
set_target_properties(jsonlib PROPERTIES PUBLIC_HEADER "src/jsonlib.h")
target_link_libraries(jsonlib PUBLIC cjson)
target_compile_definitions(jsonlib 
    PRIVATE $<$<STREQUAL:$<TARGET_PROPERTY:TYPE>,SHARED_LIBRARY>:JSONLIB_EXPORTS>
    PUBLIC $<$<STREQUAL:$<TARGET_PROPERTY:TYPE>,SHARED_LIBRARY>:JSONLIB_IS_DLL>
)

conan_example
│  CMakeLists.txt
│      
└─src
       jsonlib.c
       jsonlib.h

$ conan new jsonlib/1.0.0 --template cmake_lib
File saved: CMakeLists.txt
File saved: conanfile.py
File saved: src/jsonlib.cpp
File saved: src/jsonlib.h
File saved: test_package/CMakeLists.txt
File saved: test_package/conanfile.py
File saved: test_package/src/example.cpp

conan_example
│  CMakeLists.txt
│  conanfile.py
│  
├─src
│      jsonlib.cpp
│      jsonlib.h
│      
└─test_package
    │  CMakeLists.txt
    │  conanfile.py
    │  
    └─src
            example.cpp

#include <stdio.h>
#include <jsonlib.h>

int main(int argc, char** argv)
{
    char jstr[] = "{\"hello\":\"world\"}";
    printf("JSON:%s\n",jstr);

    char fieldbuf[32];
    int c = jlib_parse_field(jstr,"hello",fieldbuf,sizeof(fieldbuf));
    if(0 == c){
        printf("parsed 'hello' field:  %s\n",fieldbuf);
    }

    return 0;
}

# 注意是 conan_example jsonlib分支
$ cd conan_example
$ conan create .
Exporting package recipe
jsonlib/1.0.0 exports_sources: Copied 1 '.txt' file: CMakeLists.txt
jsonlib/1.0.0 exports_sources: Copied 1 '.c' file: jsonlib.c
jsonlib/1.0.0 exports_sources: Copied 1 '.h' file: jsonlib.h
jsonlib/1.0.0: A new conanfile.py version was exported
jsonlib/1.0.0: Folder: C:\Users\guyadong\.conan\data\jsonlib\1.0.0\_\_\export
jsonlib/1.0.0: Exported revision: 5f5439068d01c7592ebbcb724712ce89
.....
.....
Capturing current environment in deactivate_conanrunenv-release-x86_64.bat
Configuring environment variables
JSON:{"hello":"world"}
parsed 'hello' field:  "world"

conan upload jsonlib/1.0.0  -r ${repo} --all
# ${repo}为私有制品库的名字