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本文所述实例是从一个Red Hat开源项目里面扒出来的，非常实用！读者还可以根据自身需求加以修改！完整源码如下：
Log.h文件部分：
#ifndef __LOG_H__
#define __LOG_H__
#include <stdio.h>
#include <tchar.h>
#include <crtdbg.h>
#include <windows.h>
#include <time.h>
#include <sys/timeb.h>
class CLog {
public:
~CLog();
static CLog* get(TCHAR* path = NULL);
void printf(const char* format, ...);
private:
CLog(FILE* handle);
private:
static CLog* _log;
FILE* _handle;
};
enum {
LOG_DEBUG,
LOG_INFO,
LOG_WARN,
LOG_ERROR,
LOG_FATAL
};
#ifdef _DEBUG
static unsigned int log_level = LOG_DEBUG;
#else
static unsigned int log_level = LOG_INFO;
#endif
#define PRINT_LINE(type, format, datetime, ms, ...) \
printf("%lu::%s::%s,%.3d::%s::" format "\n", GetCurrentThreadId(), type, datetime, ms, \
__FUNCTION__, ## __VA_ARGS__);
#define LOG(type, format, ...) do { \
if (type >= log_level && type <= LOG_FATAL) { \
CLog* log = CLog::get(); \
const char *type_as_char[] = { "DEBUG", "INFO", "WARN", "ERROR", "FATAL" }; \
struct _timeb now; \
struct tm today; \
char datetime_str[20]; \
_ftime_s(&now); \
localtime_s(&today, &now.time); \
strftime(datetime_str, 20, "%Y-%m-%d %H:%M:%S", &today); \
if (log) { \
log->PRINT_LINE(type_as_char[type], format, datetime_str, now.millitm, ## __VA_ARGS__); \
} else { \
PRINT_LINE(type_as_char[type], format, datetime_str, now.millitm, ## __VA_ARGS__); \
} \
} \
} while(0)
#define log_printf(format, ...) LOG(LOG_INFO, format, ## __VA_ARGS__)
#define LOG_INFO(format, ...) LOG(LOG_INFO, format, ## __VA_ARGS__)
#define LOG_WARN(format, ...) LOG(LOG_WARN, format, ## __VA_ARGS__)
#define LOG_ERROR(format, ...) LOG(LOG_ERROR, format, ## __VA_ARGS__)
#define DBGLEVEL 1000
#define DBG(level, format, ...) do { \
if (level <= DBGLEVEL) { \
LOG(LOG_DEBUG, format, ## __VA_ARGS__); \
} \
} while(0)
#define ASSERT(x) _ASSERTE(x)
#endif
</div>
Log.cpp文件部分：
#include "Log.h"
#include <stdio.h>
#include <stdarg.h>
#include <share.h>
#define LOG_ROLL_SIZE (1024 * 1024)
CLog* CLog::_log = NULL;
CLog::CLog(FILE* handle)
: _handle(handle)
{
_log = this;
}
CLog::~CLog()
{
if (_log && _handle) {
fclose(_handle);
_log = NULL;
}
}
CLog* CLog::get(char* path)
{
if (_log) {
return _log;
}
if(!path)
{
path = "dll.log";
}
DWORD size = 0;
HANDLE file = CreateFile(path, GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL,
NULL);
if (file != INVALID_HANDLE_VALUE) {
size = GetFileSize(file, NULL);
CloseHandle(file);
}
if (size != INVALID_FILE_SIZE && size > LOG_ROLL_SIZE) {
TCHAR roll_path[MAX_PATH];
sprintf(roll_path, "%s.1", path);
if (!MoveFileEx(path, roll_path, MOVEFILE_REPLACE_EXISTING)) {
return NULL;
}
}
FILE* handle = fopen(path, "a+");
if (!handle) {
return NULL;
}
_log = new CLog(handle);
return _log;
}
void CLog::printf(const char* format, ...)
{
va_list args;
va_start(args, format);
vfprintf(_handle, format, args);
va_end(args);
fflush(_handle);
}
</div>
</div>