方便的读取配置项类

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本文的目的是分享一个好用的，可用于大型项目中读取配置项的类ConfigFileReader，包含了一系列的读写配置项，加载配置项文件等相关操作，可直接拿来使用。需要的人拿走。

具体代码如下，贴在这里方便阅读，源代码可以到我的github上获取https://github.com/hailong0715/CodeSegment.git

/*CConfigFileReader 类用于读取配置文件中的各个配置项，配置项形式KEY = VALUE */#include <iostream>#include <map>using namespace std;class CConfigFileReader{public:CConfigFileReader(const char* filename);~CConfigFileReader();char* GetConfigValue(const char* name);int SetConfigValue(const char * name, const char* value);private:void _LoadFile(const char* filename);int _WriteFile(const char* filename = nullptr);void _ParseLine(char* line);char* _TrimSpace(char* name);bool m_load_ok;map<string, string> m_config_map;string m_config_file;};

#include "CConfigFileReader.h"#include <stdio.h>CConfigFileReader::CConfigFileReader(const char* filename){_LoadFile(filename);}CConfigFileReader::~CConfigFileReader(){}char* CConfigFileReader::GetConfigValue(const char* name){if (!m_load_ok)return NULL;char* value = NULL;map<string, string>::iterator it = m_config_map.find(name);if (it != m_config_map.end()){value = (char*)it->second.c_str();}return value;}int CConfigFileReader::SetConfigValue(const char* name, const char* value){if (!m_load_ok)return -1;map<string, string>::iterator it = m_config_map.find(name);if (it != m_config_map.end()){it->second = value;}else{m_config_map.insert(make_pair(name, value));}return _WriteFile();;}void CConfigFileReader::_LoadFile(const char* filename){m_config_file.clear();m_config_file.append(filename);FILE *fp ;fopen_s(&fp, filename, "r");if (!fp){printf("Can not open config file %s error = %d", filename, errno);return;}char buf[256];for (;;){char* p = fgets(buf, 256, fp);if (!p)break;size_t len = strlen(p);if (buf[len - 1] == '\n')  //删除行末尾的换行符buf[len - 1] = 0;char* ch = strchr(buf, '#'); //删除以#号开始的注释if (ch)*ch = 0;  //若这行是注释，则将该行的第一个字符设置为'\0'if (strlen(buf) == 0)continue;_ParseLine(buf);}fclose(fp);m_load_ok = true;}int CConfigFileReader::_WriteFile(const char * filename){FILE* fp = NULL;if (NULL == filename){fopen_s(&fp,m_config_file.c_str(), "w");}else{fopen_s(&fp,filename, "w");}if (!fp)return -1;char szConfigPair[128] = { 0 };map<string, string>::iterator it = m_config_map.begin();for (; it != m_config_map.end(); it++){sprintf_s(szConfigPair, "%s=%s\n", it->first.c_str(), it->second.c_str());unsigned int ret = fwrite(szConfigPair, sizeof(szConfigPair), 1, fp);if (1 != ret){fclose(fp);return -1;}}fclose(fp);return 0;}void CConfigFileReader::_ParseLine(char* line){if (NULL == line)return;char* ch = strchr(line, '=');if (!ch)return;*ch = 0;char* key = _TrimSpace(line);char* value = _TrimSpace(ch + 1);if (key && value){m_config_map.insert(make_pair(key, value));}}char* CConfigFileReader::_TrimSpace(char* name){if (NULL == name)return NULL;char* start_pos = name;while (*start_pos == ' ' || *start_pos == '\t')start_pos++;if (strlen(start_pos) == 0)return NULL;char* end_pos = name + strlen(name) - 1;while (*end_pos == ' ' || *end_pos == '\t'){*end_pos = 0;end_pos--;}int len = end_pos - start_pos + 1;if (len <= 0)return NULL;return start_pos;}

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