读写文件

最新推荐文章于 2022-11-02 16:25:10 发布

原创最新推荐文章于 2022-11-02 16:25:10 发布 · 506 阅读

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#buffer #null #fp #file #c #mfc

标准C方式写文件：

#include <string.h> #include <stdio.h> #include <stdlib.h> int main () { FILE *fp; fp = fopen("a.bin", "wb"); // 以二进制的方式写 if (fp == NULL) { printf("Can not open file a.txt"); } char c = 'c'; char b = 0x12; int i = 1; char buffer[10]; strcpy(buffer, "hello"); /* 写入一个字节 */ fwrite(&c, 1, 1, fp); /* 写入一个字节 */ fwrite(&b, 1, 1, fp); /* 写入四个字节 */ fwrite(&i, 4, 1, fp); /* 写入5个字节 */ fwrite(buffer, 5, 1, fp); fclose(fp); return 0; }

标准C方式读文件：

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

windows API方式写文件：

#include "StdAfx.h" #include "windows.h" #include <string.h> #include <stdio.h> #include <stdlib.h> int main(int argc, char* argv[]) { // 创建文件 HANDLE hFile = ::CreateFile("a.txt",GENERIC_WRITE,0,NULL,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL); if (hFile == INVALID_HANDLE_VALUE) { OutputDebugString("Can not open file a.txt"); return 0; } char c = 'c'; char b = 0x12; int i = 1; char buffer[10]; strcpy(buffer, "hello"); DWORD dwWriteSize; /* 写入一个字节 */ WriteFile(hFile, &c, 1, &dwWriteSize, NULL); /* 写入一个字节 */ WriteFile(hFile, &b, 1, &dwWriteSize, NULL); /* 写入四个字节 */ WriteFile(hFile, &i, 4, &dwWriteSize, NULL); /* 写入五个字节 */ WriteFile(hFile, buffer, 5, &dwWriteSize, NULL); /* 强制写入磁盘 */ FlushFileBuffers(hFile); /*关闭文件*/ CloseHandle(hFile); return 0; }

windows API方式读文件：

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

标准C++方式写文件：

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

标准C++方式写文件：

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

MFC方式写文件：

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

MFC方式读文件：

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