CreateFile、ReadFile、WriteFile和fread、fwrite两种读写文件的方法

相关函数的使用可以查看MSDN上的说明文档。本文只提供实例。

程序需包含：#include “Windows.h”文件

方法一、采用：CreateFile、ReadFile、WriteFile

DWORD dwFileSize = 0;BYTE* buffer = NULL;HANDLE hFile = INVALID_HANDLE_VALUE;hFile = CreateFile("D:\\12123.jpg",GENERIC_READ,               FILE_SHARE_READ,NULL,OPEN_EXISTING,   FILE_ATTRIBUTE_NORMAL,NULL);if (hFile == INVALID_HANDLE_VALUE){CloseHandle(hFile);cout<<"Create File Failed !"<<endl;return 0;} else{dwFileSize = GetFileSize(hFile,NULL);//LARGE_INTEGER lFileSize;//GetFileSizeEx(hFile,&lFileSize);//若文件长度超过0xFFFFFFFF，使用GetFileSizeEx。cout<<"文件大小 "<<dwFileSize<<endl;buffer = new BYTE[dwFileSize];if (buffer == NULL){cout<<"Create buffer error !"<<endl;              return 0;}ZeroMemory(buffer,dwFileSize);DWORD dwReadSize = 0,dwReadTotal = 0;while (dwReadTotal < dwFileSize){ReadFile(hFile,buffer + dwReadTotal,dwFileSize - dwReadSize,&dwReadSize,NULL);dwReadTotal += dwReadSize;}cout<<"总共读取的文件大小 "<<dwReadTotal<<endl;}hFile = CreateFile("D:\\222.jpg",GENERIC_WRITE,0,NULL,               CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);if (hFile == INVALID_HANDLE_VALUE){CloseHandle(hFile);cout<<"Create File Failed -2 !"<<endl;delete []buffer;buffer = NULL;return 0;} else{DWORD dwWriteTotal = 0,dwWriteSize = 0;while (dwWriteTotal < dwFileSize){WriteFile(hFile,buffer + dwWriteTotal,dwFileSize,&dwWriteSize,NULL);dwWriteTotal += dwWriteSize;}}delete []buffer;buffer = NULL;

方法二、采用fread、fwrite

DWORD dwFileSize = 0;WIN32_FIND_DATA FileInfo;ZeroMemory(&FileInfo,sizeof(WIN32_FIND_DATA));HANDLE hFind = INVALID_HANDLE_VALUE;hFind = FindFirstFile("D:\\12123.jpg",&FileInfo); if(hFind != INVALID_HANDLE_VALUE) {dwFileSize = FileInfo.nFileSizeLow ;}FindClose(hFind);BYTE* buffer = new BYTE[dwFileSize];if (buffer == NULL){cout<<"Create buffer error !"<<endl;return 0;}ZeroMemory(buffer,dwFileSize);FILE *f = NULL;fopen_s(&f,"D:\\12123.jpg","rb");if (f == NULL){delete [] buffer;buffer = NULL;cout<<"fopen_s error -1 !"<<endl;return 0;} else{fread(buffer,dwFileSize,1,f);}fclose(f);f = NULL;fopen_s(&f,"D:\\333.jpg","wb");if (f == NULL){cout<<"fopen_s error -2 !"<<endl;return 0;}if (fwrite(buffer,dwFileSize,1,f) < 1){cout<<"fwrite error !"<<endl;}fclose(f);f = NULL;