c++ 简单的日志类 CCLog

此日志类，简单地实现了向标准输出控制台和文件输出日志信息的功能，并能在这两者之间举行切换输出，满意输出日志的不同需求。
代码如下：

1. /*
2. *  CCLog.h
3. *  c++_common_codes
4. *
5. *  Created by xichen on 12-1-12.
6. *  Copyright 2012 cc_team. All rights reserved.
7. *
8. */
9. #ifndef CC_LOG_H
10. #define CC_LOG_H
12. #include "ccString.h"
13. #include <cstdio>
15. typedef enum _LOG_TYPE
16. {
17.     LOG_TYPE_CONSOLE,
18.     LOG_TYPE_FILE,
20.     LOG_TYPE_MAX
21. }LOG_TYPE;
23. class CCLog
24. {
25. public:
26.     CCLog(const char * fileName = NULL, const char * mode = "at+");    // by default, open file by "at+" mode
27.     ~CCLog();
29. public:
30.     unsigned        write(const CCString & str);
31.     unsigned        writeEndl();
32.     void        clearAllData();            // if a file is opened, all contents of the file will be cleared, the file will be opened a second time.
34. public:
35.     void        setWriteToConsole();
36.     void        setWriteToFile();
38. public:
39.     LOG_TYPE        getLogType() const { return _logType; }
40.     CCString        getLogFileName() const { return _fileName; }
42. private:   
43.     void        clearConsole()            // not coding ok
44.     {
45.        
46.     }
48. private:
49.     CCLog(const CCLog & log);
50.     CCLog & operator=(const CCLog & log);
52. private:
53.     FILE        *_file;
54.     FILE        *_backupFile;
55.     CCString        _fileName;
56.     LOG_TYPE        _logType;
57. };
59. #endif

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1. /*
2. *  CCLog.cpp
3. *  c++_common_codes
4. *
5. *  Created by xichen on 12-1-12.
6. *  Copyright 2012 cc_team. All rights reserved.
7. *
8. */
9. #include "ccLog.h"
11. CCLog::CCLog( const char * fileName /*= NULL*/, const char * mode /*= "at+"*/ )
12. {
13.     if(fileName == NULL)
14.     {
15.         _file = _backupFile = NULL;
16.         _logType = LOG_TYPE_CONSOLE;
17.         return;
18.     }
20.     _logType = LOG_TYPE_FILE;
21.     _file = fopen(fileName, mode);
22.     _backupFile = _file;
23.     if(_file == NULL)
24.         std::cerr << "Open file error" << std::endl;
25.     else
26.         _fileName = CCString(fileName);
27. }
29. CCLog::~CCLog()
30. {
31.     if(_logType == LOG_TYPE_FILE)
32.     {
33.         if(_file != NULL)
34.         {
35.             fclose(_file);
36.             return;
37.         }
38.         if(_backupFile != NULL)
39.         {
40.             fclose(_backupFile);
41.         }
42.     }
43. }
45. unsigned CCLog::write( const CCString & str )
46. {
47.     if(_logType == LOG_TYPE_CONSOLE)
48.     {
49.         std::cout << str;
50.         return str.length();        // it's not accurate. ????
51.     }
53.     fseek(_file, 0, SEEK_END);
54.     return fwrite(str.c_str(), str.length(), 1, _file);
55. }
57. unsigned CCLog::writeEndl()
58. {
59.     return write(CCString("\n"));
60. }
63. void CCLog::clearAllData()
64. {
65.     if(_logType == LOG_TYPE_CONSOLE)
66.         return;
68.     if(_backupFile != NULL)
69.         _file = _backupFile;
71.     fclose(_file);
72.     _file = fopen(CCString(_fileName), "wt+");            // clear all the data of file
73.     _backupFile = _file;
74.     if(_file == NULL)
75.         std::cerr << "clearAllData:Open file error" << std::endl;
76. }
78. void CCLog::setWriteToConsole()
79. {
80.     _logType = LOG_TYPE_CONSOLE;
81. }
83. void CCLog::setWriteToFile()
84. {
85.     _logType = LOG_TYPE_FILE;
86. }

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简单地测试代码如下：

1. void ccTestLog()
2. {
3. #if 1            // CCLog
4.     CCLog * log = new CCLog(NULL);
5.     log->write("hello");
6.     log->write("\t1\n");
7.     log->write("\txichen\n");
9.     delete log;
10.     log = new CCLog("d:\\test\\logtest.txt");
11.     log->write("ab\t\n1");
12.     delete log;
13.     log = new CCLog("d:\\test\\logtest.txt");
14.     log->write("xiche\t123");
15.     log->clearAllData();
16.     log->write("after clear");
17.     log->setWriteToConsole();
18.     log->write("the console info");
19.     log->setWriteToFile();
20.     log->write("the file content");
21.     log->writeEndl();
22.     log->write("the next line\nhehe");
23.     delete log;
24. #endif
25. }

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