学步园

标准C方式读文件：

#include <string.h><br /> #include <stdio.h><br /> #include <stdlib.h></p> <p>int main ()<br /> {<br /> FILE *fp;<br /> fp = fopen("a.txt", "rb"); // 以二进制的方式读<br /> if (fp == NULL)<br /> {<br /> printf("Can not open file a.txt");<br /> }</p> <p> char c;<br /> int i;<br /> char buffer[10];</p> <p> /* 读入一个字节 */<br /> fread(&c, 1, 1, fp);<br /> printf("c: %c/n", c);</p> <p> /* 读入一个字节 */<br /> fread(&b, 1, 1, fp);<br /> printf("b: %.2x/n", b);</p> <p> /* 读入4个字节 */<br /> fread(&i, 4, 1, fp);<br /> printf("i: %d/n", i);</p> <p> /* 读入5个字节 */<br /> fread(buffer, 5, 1, fp);<br /> buffer[5] = '/0';<br /> printf("buffer: %s/n", buffer);</p> <p> fclose(fp);<br /> return 0;<br /> }

windows API方式读文件：

#include "StdAfx.h" </p> <p>#include "windows.h"<br /> #include <string.h><br /> #include <stdio.h><br /> #include <stdlib.h> </p> <p>int main(int argc, char* argv[])<br /> {<br /> HANDLE hFile;<br /> hFile = ::CreateFile("a.txt",GENERIC_READ, 0, NULL,OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);</p> <p> if (hFile == INVALID_HANDLE_VALUE)<br /> {<br /> printf("Can not open file a.txt");<br /> return 0;<br /> } </p> <p> char c;<br /> char b;<br /> int i;<br /> char buffer[10];<br /> DWORD dwWriteSize; </p> <p> /* 读入一个字节 */<br /> ReadFile(hFile, &c, 1, &dwWriteSize, NULL);<br /> printf("c: %c/n", c);</p> <p> /* 读入一个字节 */<br /> ReadFile(hFile, &b, 1, &dwWriteSize, NULL);<br /> printf("b: %.2x/n", b);</p> <p> /* 读入四个字节 */<br /> ReadFile(hFile, &i, 4, &dwWriteSize, NULL);<br /> printf("i: %d/n", i);</p> <p> /* 读入五个字节 */<br /> ReadFile(hFile, buffer, 5, &dwWriteSize, NULL);<br /> buffer[5] = '/0';<br /> printf("buffer: %s/n", buffer);</p> <p> /* 关闭文件 */<br /> CloseHandle(hFile);</p> <p> return 0;<br /> }

标准C++方式写文件：

#include <string><br /> #include <fstream><br /> #include <iostream></p> <p>using namespace std;</p> <p>int main(int argc, char* argv[])<br /> {<br /> ofstream out;<br /> out.open("a.txt", ios::binary);</p> <p> char c = 'c';<br /> char b = 0x12;<br /> int i = 1;<br /> char buffer[10];<br /> strcpy(buffer, "hello"); </p> <p> /* 写入一个字节 */<br /> out.write(&c, 1);</p> <p> /* 写入一个字节 */<br /> out.write(&b, 1);</p> <p> /* 写入四个字节 */<br /> out.write((char*)(&i), 4);</p> <p> /* 写入五个字节 */<br /> out.write(buffer, 5);</p> <p> out.flush();</p> <p> out.close();<br /> return 0;<br /> }

标准C++方式写文件：

#include <string><br /> #include <fstream><br /> #include <iostream></p> <p>using namespace std;</p> <p>int main(int argc, char* argv[])<br /> {<br /> ifstream in;<br /> in.open("a.txt", ios::binary);</p> <p> char c;<br /> char b;<br /> int i;<br /> char buffer[10]; </p> <p> in.read(&c, 1);<br /> printf("c: %c/n", c);</p> <p> in.read(&b, 1);<br /> printf("b: %.2x/n", b);</p> <p> in.read((char*)(&i), 4);<br /> printf("i: %d/n", i);</p> <p> in.read(buffer, 5);<br /> buffer[5] = '/0';<br /> printf("buffer: %s/n", buffer);</p> <p> return 0;<br /> }

MFC方式写文件：

CFile file;</p> <p> file.Open("a.txt", CFile::modeWrite|CFile::modeCreate);</p> <p> char c = 'c';<br /> char b = 0x12;<br /> int i = 1;<br /> char buffer[10];<br /> strcpy(buffer, "hello");</p> <p> /* 写入1字节 */<br /> file.Write(&c, 1);</p> <p> /* 写入1字节 */<br /> file.Write(&b, 1);</p> <p> /* 写入4字节 */<br /> file.Write(&i, 4);</p> <p> /* 写入5字节 */<br /> file.Write(buffer, 5);</p> <p> file.Flush();</p> <p> file.Close();

MFC方式读文件：

CFile file;</p> <p> file.Open("a.txt", CFile::modeRead);</p> <p> char c;<br /> char b;<br /> int i;<br /> char buffer[10];<br /> CString forPrint;</p> <p> /* 读入1字节 */<br /> file.Read(&c, 1);<br /> forPrint.Format("c: %c", c);<br /> MessageBox(forPrint);</p> <p> /* 读入1字节 */<br /> file.Read(&b, 1);<br /> forPrint.Format("b: %.2x", b);<br /> MessageBox(forPrint);</p> <p> /* 读入4字节 */<br /> file.Read(&i, 4);<br /> forPrint.Format("i: %d", i);<br /> MessageBox(forPrint);</p> <p> /* 读入5字节 */<br /> file.Read(buffer, 5);<br /> buffer[5] = '/0';<br /> forPrint.Format("buffer: %s", buffer);<br /> MessageBox(forPrint);</p> <p> file.Close();