API Append .txt

最新推荐文章于 2022-06-24 14:34:14 发布

原创最新推荐文章于 2022-06-24 14:34:14 发布 · 386 阅读

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本文详细介绍了如何使用C++获取本地时间，并将其转换为指定格式后写入到.txt文件中。代码包括了时间的获取、格式化以及文件操作的基本流程。

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#include <windows.h>
#include <stdio.h>

void main()
{
/*	//取随机数
	srand((unsigned)time(0)); 
	g_iRand = rand();
*/
	char bufTime[128] = {0};
	SYSTEMTIME nowTime;
	GetLocalTime(&nowTime);
	sprintf(bufTime, "%4d-%02d-%02d %02d:%02d:%02d.%03d", 
		nowTime.wYear, nowTime.wMonth,  nowTime.wDay,
		nowTime.wHour, nowTime.wMinute, nowTime.wSecond, nowTime.wMilliseconds);
	
	printf("%s\n", bufTime);

// *** ***
// 写文件
	char szFileName[MAX_PATH] = {0};
	::GetModuleFileName(0, szFileName, MAX_PATH);
	char *pTxt = ".txt";
	strcat(szFileName, pTxt);
	printf("%s\n", szFileName);

	HANDLE hFile = CreateFile(
		szFileName,
		GENERIC_READ | GENERIC_WRITE,
		FILE_SHARE_WRITE,
		NULL,
		OPEN_ALWAYS,
		FILE_ATTRIBUTE_NORMAL,
		NULL);
	if (INVALID_HANDLE_VALUE == hFile)
	{
		printf("CreateFile INVALID_HANDLE_VALUE : %d\n", GetLastError());
		return;
	}

	SetFilePointer(hFile, 0, NULL, FILE_END); // 移至文件末尾
	int iLen = strlen(bufTime);
	bufTime[iLen]   = 0x0D;
	bufTime[iLen+1] = 0x0A;
	bufTime[iLen+2] = 0;

	DWORD dwWritten = 0;
	if (0 == WriteFile(hFile, bufTime, iLen+2, &dwWritten, NULL))
	{
		printf("WriteFile err : %d\n", GetLastError());
		::CloseHandle(hFile);
		return;
	}

	if (dwWritten != ((DWORD)(iLen+2)))
	{
		printf("WriteFile 'dwWritten != iLen+2' : %d (dwWritten : %d - iLen+2 : %d)\n", 
			GetLastError(), dwWritten, iLen+2);
		::CloseHandle(hFile);
		return;
	}
	::CloseHandle(hFile);
}