//在指定文件路径写入指定信息,unicode版本
void CLog::WriteLog(const wchar_t* filePath, const wchar_t* text)
{
//首先判断文件是否存在,如果不存在则创建,并在开头加入0xfeff;如果存在则直接写入
if (_waccess(filePath, 0) == -1)
{
FILE* fp;
_wfopen_s(&fp, filePath, L"wb");
if (fp != NULL)
{
uint16_t wSignature = 0xFEFF;
fwrite(&wSignature, 2, 1, fp);
SYSTEMTIME st;
GetLocalTime(&st);
wchar_t buf[128] = { 0 };
swprintf_s(buf, 128, L"%04d%02d%02d %02d:%02d:%02d:%03d ", st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond, st.wMilliseconds);
fwrite(buf, sizeof(wchar_t), wcslen(buf), fp);
fwrite(text, sizeof(wchar_t), wcslen(text), fp);
fwrite(L"\r\n", sizeof(wchar_t), 2, fp);
fclose(fp);
}
}
else
{
FILE* fp;
_wfopen_s(&fp, filePath, L"ab");
if (fp != NULL)
{
SYSTEMTIME st;
GetLocalTime(&st);
wchar_t buf[128] = { 0 };
swprintf_s(buf, 128, L"%04d%02d%02d %02d:%02d:%02d:%03d ", st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond, st.wMilliseconds);
fwrite(buf, sizeof(wchar_t), wcslen(buf), fp);
fwrite(text, sizeof(wchar_t), wcslen(text), fp);
fwrite(L"\r\n", sizeof(wchar_t), 2, fp);
fclose(fp);
}
}
}
//在指定文件路径写入指定信息,ANSI版本
void CLog::WriteLog(const char* filePath, const char* text)
{
FILE* fp;
fopen_s(&fp, filePath, "a");
if (fp != NULL)
{
SYSTEMTIME st;
GetLocalTime(&st);
char buf[128] = { 0 };
sprintf_s(buf, 128, "%04d%02d%02d %02d:%02d:%02d:%03d ", st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond, st.wMilliseconds);
fwrite(buf, sizeof(char), strlen(buf), fp);
fwrite(text, sizeof(char), strlen(text), fp);
fwrite("\r\n", sizeof(char), 2, fp);
fclose(fp);
}
}
//在指定文件路径写入指定信息,格式化字符串版本
void CLog::WriteLogEx(const char* filePath, const char* const format, ...)
{
std::string tmp;
va_list maker = NULL;
va_start(maker, format);
size_t numofchar = _vscprintf(format, maker);
if (numofchar > tmp.capacity())
{
tmp.resize(numofchar + 1);
}
vsprintf_s((char*)tmp.data(), tmp.capacity(), format, maker);
va_end(maker);
std::string text = tmp;
FILE* fp;
fopen_s(&fp, filePath, "a");
if (fp != NULL)
{
SYSTEMTIME st;
GetLocalTime(&st);
char buf[128] = { 0 };
sprintf_s(buf, 128, "%04d%02d%02d %02d:%02d:%02d:%03d ", st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond, st.wMilliseconds);
fwrite(buf, sizeof(char), strlen(buf), fp);
fwrite(text.c_str(), sizeof(char), text.length(), fp);
fwrite("\r\n", sizeof(char), 2, fp);
fclose(fp);
}
}
C++ 写日志文件
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转载自blog.csdn.net/qq_24127015/article/details/86607168
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