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Retrieving the Last-Write Time
The following example uses the GetFileTime function to retrieve the last-write time for a file. It converts the time to local time based on the current time-zone settings, and creates a date and time string that can be shown to the user.
#include <windows.h> #include <tchar.h> #include <strsafe.h> // GetLastWriteTime - Retrieves the last-write time and converts // the time to a string // // Return value - TRUE if successful, FALSE otherwise // hFile - Valid file handle // lpszString - Pointer to buffer to receive string BOOL GetLastWriteTime(HANDLE hFile, LPTSTR lpszString, DWORD dwSize) { FILETIME ftCreate, ftAccess, ftWrite; SYSTEMTIME stUTC, stLocal; DWORD dwRet; // Retrieve the file times for the file. if (!GetFileTime(hFile, &ftCreate, &ftAccess, &ftWrite)) return FALSE; // Convert the last-write time to local time. FileTimeToSystemTime(&ftWrite, &stUTC); SystemTimeToTzSpecificLocalTime(NULL, &stUTC, &stLocal); // Build a string showing the date and time. dwRet = StringCchPrintf(lpszString, dwSize, TEXT("%02d/%02d/%d %02d:%02d"), stLocal.wMonth, stLocal.wDay, stLocal.wYear, stLocal.wHour, stLocal.wMinute); if( S_OK == dwRet ) return TRUE; else return FALSE; } int _tmain(int argc, TCHAR *argv[]) { HANDLE hFile; TCHAR szBuf[MAX_PATH]; if( argc != 2 ) { printf("This sample takes a file name as a parameter\n"); return 0; } hFile = CreateFile(argv[1], GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL); if(hFile == INVALID_HANDLE_VALUE) { printf("CreateFile failed with %d\n", GetLastError()); return 0; } if(GetLastWriteTime( hFile, szBuf, MAX_PATH )) _tprintf(TEXT("Last write time is: %s\n"), szBuf); CloseHandle(hFile); }
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