Windows——将一个文件附加到另一个文件

#include <stdio.h>
#include <Windows.h>									//调用Windows API需要加此头文件

int main(int argc, char *argv[])						
{
	HANDLE hFile;												
	HANDLE hAppend;										//声明句柄变量
	DWORD  dwBytesRead, dwBytesWritten, dwPos;			//DWORD等同于无符号的int
	BYTE   buff[4096];									//声明数组，该数组申请的内存空间为4096个字节

	hFile = CreateFile(TEXT("E:\\file1\\file1_1.txt"),	//注意Visual环境下路径的单个\为转义字符
		GENERIC_READ,											
		0,
		NULL,
		OPEN_EXISTING,
		FILE_ATTRIBUTE_NORMAL,
		NULL);											//注意被调用函数的参数个数不能少
	
	if (hFile == INVALID_HANDLE_VALUE)
	{
		printf("Could not open file1_1.txt.");

		return 0;										//返回值的类型要与调用其函数的类型相同
	}

	hAppend = CreateFile(TEXT("E:\\file1\\file1_2.txt"),
		FILE_APPEND_DATA,
		FILE_SHARE_READ,
		NULL,
		OPEN_ALWAYS,
		FILE_ATTRIBUTE_NORMAL,
		NULL);

	if (hAppend == INVALID_HANDLE_VALUE)
	{
		printf("Could not open file1_2.txt.");

		return 0;
	}

	while (ReadFile(hFile, buff, sizeof(buff), &dwBytesRead, NULL)
		&& dwBytesRead > 0)
	{
		dwPos = SetFilePointer(hAppend, 0, NULL, FILE_END);
		LockFile(hAppend, dwPos, 0, dwBytesRead, 0);
		WriteFile(hAppend, buff, dwBytesRead, &dwBytesWritten, NULL);
		UnlockFile(hAppend, dwPos, 0, dwBytesRead, 0);
	}

	CloseHandle(hFile);
	CloseHandle(hAppend);

	return 0;
}