WinApi学习笔记-读写文件

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

DWORD MyReadFile(LPSTR filePath)
{
HANDLE hFileRead;
LARGE_INTEGER liFileSize;
DWORD dwReadSize;
LONGLONG liTotalRead = 0;
BYTE lpFileDataBuffer[32];

hFileRead = CreateFile(
filePath,
GENERIC_READ,
FILE_SHARE_READ,
NULL,
OPEN_ALWAYS,//有就打开，没有就创建
FILE_ATTRIBUTE_NORMAL,
NULL
);
if(hFileRead == INVALID_HANDLE_VALUE)
{
printf("open error");
}
if(!GetFileSizeEx(hFileRead,&liFileSize))
{
printf("get size error");
}
else
{
printf("size is %d\n",liFileSize.QuadPart);//???
}
while(true)
{
DWORD i;
if(!ReadFile(hFileRead,lpFileDataBuffer,32,&dwReadSize,NULL))
{
printf("error while reading");
}
printf("read %d byte\n",&dwReadSize);
for(i = 0;i<dwReadSize;i++)
{
printf("  0x%x   ",lpFileDataBuffer[i]);
std::cout<<lpFileDataBuffer[i]<<std::endl;
}
printf("\n");
liTotalRead += dwReadSize;
if(liTotalRead == liFileSize.QuadPart)
{
printf("end");
break;
}
}
CloseHandle(hFileRead);
return 0;
}
int main()
{
MyReadFile("c:\\a.txt");
char a;
std::cin >> a;
return 0;
}

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

DWORD MyWriteFile(LPSTR filePath,LPVOID lpData,DWORD dwSize)
{
HANDLE hWrite;
DWORD dwWriteSize;
hWrite = CreateFile(filePath,GENERIC_WRITE,0,NULL,OPEN_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);
if(hWrite == INVALID_HANDLE_VALUE)
{
printf("open error");
}
SetFilePointer(hWrite,0,0,FILE_END);//??
if(!WriteFile(hWrite,lpData,dwSize,&dwWriteSize,NULL))
{
printf("error while writeing");
}
CloseHandle(hWrite);
return 0;
}
int main()
{
MyWriteFile("c:\\a.txt","myxland",lstrlen("myxland"));
char a;
std::cin >> a;
return 0;
}