我想使用jsoncpp编写C代码以解析

JSON文件.让我解释一下我做了什么.我创建了一个CMakeLists.txt,我创建了一个FindJsoncpp.cmake以及一个简单的c文件来测试jsoncpp.当我使用-I /usr/include / jsoncpp / -ljsoncpp编译没有cmake的C源时,它工作正常.但是当我尝试使用cmake构建它时,它找不到我在c源代码中包含的json.h头文件.

这是我的CMakeLists.txt：

cmake_minimum_required (VERSION 2.6)

project (Parser)

set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/Modules/")

include(LibFindMacros)

message("----------- trying to find Jsoncpp-------------")

find_package(Jsoncpp)

if(Jsoncpp_FOUND)

message("INFO: we found LibJsoncpp on your pc.")

message(Jsoncpp_FOUND = ${Jsoncpp_FOUND})

message(Jsoncpp_INCLUDE_DIR = ${Jsoncpp_INCLUDE_DIR})

message(Jsoncpp_LIBRARY = ${Jsoncpp_LIBRARY})

else(Jsoncpp_FOUND)

message("WARNING: we couldn't find LibJsoncpp on your pc. DLC is disabled.")

endif(Jsoncpp_FOUND)

#set(LIBS ${Jsoncpp_LIBRARY})

# Set the include dir variables and the libraries and let libfind_process do the rest.

# NOTE: Singular variables for this library, plural for libraries this this lib depends on.

set(Jsoncpp_PROCESS_INCLUDES Jsoncpp_INCLUDE_DIR)

set(Jsoncpp_PROCESS_LIBS Jsoncpp_LIBRARY)

# add the executable

add_executable(jsonparser jsonparser.cpp)

这是我写的FindJsoncpp.cmake：

# - Try to find Jsoncpp

# Once done, this will define

#

# Jsoncpp_FOUND - system has Jsoncpp

# Jsoncpp_INCLUDE_DIRS - the Jsoncpp include directories

# Jsoncpp_LIBRARIES - link these to use Jsoncpp

include(LibFindMacros)

# Use pkg-config to get hints about paths

libfind_pkg_check_modules(Jsoncpp_PKGCONF jsoncpp)

# Include dir

find_path(Jsoncpp_INCLUDE_DIR

NAMES json/json.h

# PATHS ./jsoncpp/

PATHS ${Jsoncpp_PKGCONF_INCLUDE_DIRS} # /usr/include/jsoncpp/json

)

# Finally the library itself

find_library(Jsoncpp_LIBRARY

NAMES jsoncpp

PATHS ${Jsoncpp_PKGCONF_LIBRARY_DIRS}

# PATH ./jsoncpp/

)

set(Jsoncpp_PROCESS_INCLUDES Jsoncpp_INCLUDE_DIR)

set(Jsoncpp_PROCESS_LIBS Jsoncpp_LIBRARY)

libfind_process(Jsoncpp)

最后一个名为jsonparser.cpp的简单C代码来测试它：

#include

#include

#include

using namespace std;

void printSongInfo(Json::Value song){

std::clog<

std::clog<

std::clog<

}

int main(){

std::ifstream catalogFile("catalog.json");

Json::Value root; // will contains the root value after parsing.

Json::Reader reader;

bool parsingSuccessful = reader.parse( catalogFile, root );

if ( !parsingSuccessful ){

// report to the user the failure and their locations in the document.

std::cout << "Failed to parse configuration\n"

<< reader.getFormattedErrorMessages();

return 1;

}

//parsing songs

const Json::Value songs = root["songs"];

for ( int index = 0; index < songs.size(); ++index ){ // Iterates over the sequence elements.

printSongInfo(songs[index] );

}

return 0;

}

当我用下面的命令运行jsonparser.cpp时它工作得很好.

g++ -I/usr/include/jsoncpp/ -ljsoncpp jsonparser.cpp

但是当我尝试使用cmake时,我得到了这个错误：

$~/jsoncppTest/build$cmake ..

-- The C compiler identification is GNU 4.7.3

-- The CXX compiler identification is GNU 4.7.3

-- Check for working C compiler: /usr/bin/cc

-- Check for working C compiler: /usr/bin/cc -- works

-- Detecting C compiler ABI info

-- Detecting C compiler ABI info - done

-- Check for working CXX compiler: /usr/bin/c++

-- Check for working CXX compiler: /usr/bin/c++ -- works

-- Detecting CXX compiler ABI info

-- Detecting CXX compiler ABI info - done

----------- trying to find Jsoncpp-------------

-- Found PkgConfig: /usr/bin/pkg-config (found version "0.26")

-- checking for module 'jsoncpp'

-- found jsoncpp, version 0.6.0

-- Found Jsoncpp

INFO: we found LibJsoncpp on your pc.

Jsoncpp_FOUND=TRUE

Jsoncpp_INCLUDE_DIR=/usr/include/jsoncpp

Jsoncpp_LIBRARY=/usr/lib/libjsoncpp.so

-- Configuring done

-- Generating done

-- Build files have been written to: ~/jsoncppTest/build

$~/jsoncppTest/build$make

Scanning dependencies of target jsonparser

[100%] Building CXX object CMakeFiles/jsonparser.dir/jsonparser.cpp.o

~/jsoncppTest/jsonparser.cpp:3:23: fatal error: json/json.h: No such file or directory

compilation terminated.

make[2]: *** [CMakeFiles/jsonparser.dir/jsonparser.cpp.o] Error 1

make[1]: *** [CMakeFiles/jsonparser.dir/all] Error 2

make: *** [all] Error 2

它找不到json / json.h头文件,但它之前在cmake中创建了jsoncpp库.我检查了jsoncpp.pc文件,发现了确定.我不知道我做错了什么！任何帮助,将不胜感激.

我正在使用ubuntu 13.04和multiarch支持.我听说过有关64位编译器的jsoncpp问题,但不知道是不是这样.