winapi : WriteFile - 파일에 데이터를 쓴다.

BOOL WINAPI WriteFile(
  __in         HANDLE hFile,
  __in         LPCVOID lpBuffer,
  __in         DWORD nNumberOfBytesToWrite,
  __out_opt    LPDWORD lpNumberOfBytesWritten,
  __inout_opt  LPOVERLAPPED lpOverlapped
);

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

#define MAX_LINE 1024

int main(int argc, char **argv)
{
	char buf[MAX_LINE];
	HANDLE source_fh,dest_fh;
	int readn, writen;
	if (argc != 3)
	{
		printf("Usge : %s [source file] [dest file]\n", argv[0]);
		return 0;
	}

	source_fh= CreateFile(
		argv[1],
		GENERIC_READ,
		0,
		NULL,
		OPEN_EXISTING,
		FILE_ATTRIBUTE_NORMAL,
		NULL
		);
	if(source_fh == INVALID_HANDLE_VALUE)
	{
		printf("FILE Open Error %d\n", GetLastError);
		return 1;
	}
	dest_fh = CreateFile(
		argv[2],
		GENERIC_WRITE,
		0,
		NULL,
		CREATE_NEW,
		FILE_ATTRIBUTE_NORMAL,
		NULL
		);
	if (dest_fh == INVALID_HANDLE_VALUE)
	{
		if (GetLastError() == ERROR_FILE_EXISTS) 
			printf("Dest File Already exists\n");
		else 
			printf("Dest File Open Error\n");
		return 1;
	}
	

	while(1)
	{
		memset(buf, 0x00, MAX_LINE);
		ReadFile(source_fh, buf, MAX_LINE-1, &readn, NULL);
		if(readn <= 0)
			break;
		WriteFile(dest_fh, buf, readn, &writen, NULL);
		printf("%d\n", writen);
	}
	return 0;
}