用内存映射的方式在文件末尾追加一个hello

#include <windows.h>
#include <iostream>
using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
	HANDLE hFile = CreateFile("one.dat", GENERIC_READ | GENERIC_WRITE,
		FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, NULL, NULL);

	if (hFile == INVALID_HANDLE_VALUE)
	{
		cout << "CreateFile is fail" << endl;
		return 0;
	}
	DWORD dwFileSize = GetFileSize(hFile, NULL);

	HANDLE hFileMap = CreateFileMapping(hFile, NULL, PAGE_READWRITE, 0,
		dwFileSize + 5 * sizeof(char), "wsTest");

	LPVOID lpView = NULL;
	if (hFileMap)
	{
		lpView = MapViewOfFile(hFileMap, FILE_MAP_WRITE, 0, 0, 0);
	}

	char *lpContent = (char*)lpView;
	strcpy(lpContent + dwFileSize / sizeof(char), "hello");

	UnmapViewOfFile(lpView);
	CloseHandle(hFileMap);
	CloseHandle(hFile);

	cin.get();
	return 0;
}

2011-08-10