提示：文章
文章目录
- 前言
- 一、背景
- 二、
- 2.1
- 2.2
- 总结
前言
前期疑问：
本文目标：
一、背景
这个文章主要是针对二进制文件的读写
大概会分为c语言对二进制文件读写和c++对二进制文件的读写
查找资料看到这篇文章：二进制文件的读写操作，文章是分别对整型变量、数组、字符串进行读写。我其实想得到是对混合的数据的读写，但是我突然想到可以将整型数据转成char型然后使用字符串写成二进制啊。没毛病，那么很长的字符串(大于1024)是怎么写入呢。可以试一下。
二、c语言读写二进制文件
2.1
二进制读写文件
#include <iostream>
#include <stdio.h>
#include <string.h>struct BinaryWriteStruct
{char a;int b;float c;double d;char array[15];//std::string e;BinaryWriteStruct(){a = '0';b = 0;c = 0.0f;d = 0;memset(array, 0, sizeof(array));}
};typedef BinaryWriteStruct BinaryWrite;struct BinaryWriteStruct2
{char a;int b;float c;double d;char array[15];
};typedef BinaryWriteStruct2 BinaryWrite2;void BinaryWriteInteger()
{FILE* writeFile = fopen("E:\\writeInteger.txt", "wb");if (writeFile == nullptr) {printf("%s", "file open failed\n");}// 存储一个整型变量int a = -11; //-1的二进制：fwrite(&a, sizeof(int), 1, writeFile);fclose(writeFile);
}void BinaryReadInteger()
{FILE* readFile = fopen("E:\\writeInteger.txt", "r");if (readFile == nullptr) {printf("%s", "file open failed\n");}// 存储一个整型变量int a = 0; //-1的二进制：fread(&a, sizeof(int), 1, readFile);printf("a:%d\n", a);fclose(readFile);
}void BinaryWriteStruct()
{FILE* writeFile = fopen("E:\\writeStruct.txt", "wb");if (writeFile == nullptr) {printf("%s", "file open failed\n");}// 存储一个结构体变量BinaryWrite binaryWrite;binaryWrite.a = 'Q';binaryWrite.b = 1;binaryWrite.c = 2.1f;binaryWrite.d = 4;strcpy(binaryWrite.array, "hello world");//binaryWrite.e = "this ia a string"; //这边写入string会导致读不到正确的数据，fwrite是c函数，std::string是c++对象// 测试结构体，验证为什么BinaryWrite结构体不能定义时直接赋值初始化BinaryWrite2 binaryWrite2 = {'Q', 1, 2, 3, "test"}; //当结构体没有构造函数时可以这样初始化，有构造函数就要上述初始化方式fwrite(&binaryWrite, sizeof(BinaryWrite), 1, writeFile);fclose(writeFile);
}void BinaryReadStruct()
{FILE* readFile = fopen("E:\\writeStruct.txt", "rb"); //这边不写"rb"会读不到数据if (readFile == nullptr) {printf("%s", "file open failed\n");}// 存储一个整型变量BinaryWrite binaryWrite;fread(&binaryWrite, sizeof(BinaryWrite), 1, readFile);printf("a:%c\n", binaryWrite.a);printf("b:%d\n", binaryWrite.b);printf("c:%f\n", binaryWrite.c);printf("d:%f\n", binaryWrite.d);printf("array:%s\n", binaryWrite.array);//printf("e:%s\n", binaryWrite.e.c_str());fclose(readFile);
}void BinaryWriteString()
{char array[] = {"data:34567668-0-05678709886r434563212212225113e65r41325541235412344236544265344652344542365442356442653446""5234465234464236544235644524423445243442344244234452344523442534452434524345243452434562434562344524345245""454564544,data:34567668-0-05678709886r434563212212225113e65r4132554123541234423654426534465234454236544235""6442653446523446523446423654423564452442344524344234424423445234452344253445243452434524345243456243456234""4524345245454564544,data:34567668-0-05678709886r434563212212225113e65r413255412354123442365442653446523445""4236544235644265344652344652344642365442356445244234452434423442442344523445234425344524345243452434524345""62434562344524345245454564544,data:34567668-0-05678709886r434563212212225113e65r41325541235412344236544265""3446523445423654423564426534465234465234464236544235644524423445243442344244234452344523442534452434524345""243452434562434562344524345245454564544,data:34567668-0-05678709886r434563212212225113e65r4132554123541234""4236544265344652344542365442356442653446523446523446423654423564452442344524344234424423445234452344253445""2434524345243452434562434562344524345245454564544, end"};FILE* writeFile = fopen("E:\\writeString.nag", "wb");if (writeFile == nullptr) {printf("%s", "file open failed\n");}fwrite(array, sizeof(char), sizeof(array), writeFile);fclose(writeFile);
}
void BinaryReadString()
{FILE* readFile = fopen("E:\\writeString.txt", "rb");if (readFile == nullptr) {printf("%s", "file open failed\n");}char array[10000] = {'\0'};char tempStr[100] = {'\0'};int count = 0;while (!(feof(readFile) || ferror(readFile))) {fread(tempStr, sizeof(char), sizeof(tempStr), readFile);strcpy(array + 100 * count, tempStr);count++;}if (ferror(readFile)) {printf("file read fail\n");}fclose(readFile);printf("%s\n", array);
}int main()
{// 二进制写入整型BinaryWriteInteger();BinaryReadInteger();// 二进制写入结构体BinaryWriteStruct();BinaryReadStruct();// 二进制写入字符串BinaryWriteString();BinaryReadString();return 0;
}
打印结果
a:-11
a:Q
b:1
c:2.100000
d:4.000000
array:hello world
data:34567668-0-05678709886r434563212212225113e65r4132554123541234423654426534465234454236544235644265344652344652344642
36544235644524423445243442344244234452344523442534452434524345243452434562434562344524345245454564544,data:34567668-0-05
678709886r434563212212225113e65r4132554123541234423654426534465234454236544235644265344652344652344642365442356445244234
45243442344244234452344523442534452434524345243452434562434562344524345245454564544,data:34567668-0-05678709886r43456321
2212225113e65r4132554123541234423654426534465234454236544235644265344652344652344642365442356445244234452434423442442344
52344523442534452434524345243452434562434562344524345245454564544,data:34567668-0-05678709886r434563212212225113e65r4132
554123541234423654426534465234454236544235644265344652344652344642365442356445244234452434423442442344523445234425344524
34524345243452434562434562344524345245454564544,data:34567668-0-05678709886r434563212212225113e65r4132554123541234423654
426534465234454236544235644265344652344652344642365442356445244234452434423442442344523445234425344524345243452434524345
62434562344524345245454564544, end
三、c++读写二进制文件
3.1
下面是c++二进制读写文件
void BinaryWriteStringByCpp()
{char array[] = {"data:34567668-0-05678709886r434563212212225113e65r41325541235412344236544265344652344542365442356442653446""5234465234464236544235644524423445243442344244234452344523442534452434524345243452434562434562344524345245""454564544,data:34567668-0-05678709886r434563212212225113e65r4132554123541234423654426534465234454236544235""6442653446523446523446423654423564452442344524344234424423445234452344253445243452434524345243456243456234""4524345245454564544,data:34567668-0-05678709886r434563212212225113e65r413255412354123442365442653446523445""4236544235644265344652344652344642365442356445244234452434423442442344523445234425344524345243452434524345""62434562344524345245454564544,data:34567668-0-05678709886r434563212212225113e65r41325541235412344236544265""3446523445423654423564426534465234465234464236544235644524423445243442344244234452344523442534452434524345""243452434562434562344524345245454564544,data:34567668-0-05678709886r434563212212225113e65r4132554123541234""4236544265344652344542365442356442653446523446523446423654423564452442344524344234424423445234452344253445""2434524345243452434562434562344524345245454564544, cpp end"};std::ofstream outputStream("E:\\writeStringByCpp.nag", std::ios::out | std::ios::binary);if (!outputStream.is_open()) {printf("file open failed\n");}outputStream.write(array, sizeof(array));
}void BinaryReadStringByCpp()
{std::ifstream inputStream("E:\\writeStringByCpp.nag", std::ios::in | std::ios::binary);if (!inputStream.is_open()) {printf("file open failed\n");}std::stringstream inputStr;inputStr << inputStream.rdbuf();std::string str(inputStr.str());printf("%s\n", str.c_str());
}int main()
{// c++二进制读写字符串BinaryWriteStringByCpp();BinaryReadStringByCpp();return 0;
}
打印信息
data:34567668-0-05678709886r434563212212225113e65r4132554123541234423654426534465234454236544235644265344652344652344642
36544235644524423445243442344244234452344523442534452434524345243452434562434562344524345245454564544,data:34567668-0-05
678709886r434563212212225113e65r4132554123541234423654426534465234454236544235644265344652344652344642365442356445244234
45243442344244234452344523442534452434524345243452434562434562344524345245454564544,data:34567668-0-05678709886r43456321
2212225113e65r4132554123541234423654426534465234454236544235644265344652344652344642365442356445244234452434423442442344
52344523442534452434524345243452434562434562344524345245454564544,data:34567668-0-05678709886r434563212212225113e65r4132
554123541234423654426534465234454236544235644265344652344652344642365442356445244234452434423442442344523445234425344524
34524345243452434562434562344524345245454564544,data:34567668-0-05678709886r434563212212225113e65r4132554123541234423654
426534465234454236544235644265344652344652344642365442356445244234452434423442442344523445234425344524345243452434524345
62434562344524345245454564544, cpp end
总结
未完待续
