重定向以及文件扫描
#define _CRT_SECURE_NO_WARNINGS//关闭安全检查
#include<stdio.h>
#include<stdlib.h>
void main1()
{
char str[100] = { 0 };
scanf("%s", str);
printf("str=%s\n", str);
system(str);
}
void main2()
{
char str[100] = { 0 };
fscanf(stdin,"%s", str);
fprintf(stdout,"str=%s\n", str);
system(str);
}
void main3()
{
char *path = "C:\\Users\\wuyq\\Desktop\\newcmd.txt";
int num=0;
char docmd[30] = { 0 };
scanf("%d%s", &num, docmd);//接受键盘输入
FILE *pf;
pf = fopen(path, "w");//写入
if (pf == NULL)
{
printf("文件打开失败");
}
else
{
fprintf(pf, "for /l %%i in (1,1,%d) do %s", num, docmd);
fclose(pf);
}
system("pause");
}
void main4()
{
char cmd[100] = { 0 };
int num = 0;
char docmd[30] = { 0 };
char *path = "C:\\Users\\wuyq\\Desktop\\newcmd.txt";
FILE *pf = fopen(path, "r");//读取
if (pf == NULL)
{
printf("文件打开失败");
return;
}
else
{
fscanf(pf, "for /l %%i in (1,1,%d) do %s", &num, docmd);
printf("num=%d,docmd=%s", num, docmd);
}
system("pause");
}
void main()
{
int num ;
scanf("num=%d", &num);//必须精确对应
printf("num=%d", num);
system("pause");
}
二进制加密解密
#define _CRT_SECURE_NO_WARNINGS//关闭安全检查
#include<stdio.h>
#include<stdlib.h>
int getfilesize(char *path)
{
FILE *pf = fopen(path, "r");
if (pf == NULL)
{
return -1;
}
else
{
fseek(pf, 0, SEEK_END);
int length = ftell(pf);
return length;//获取文件大小
}
}
void copy(char *oldpath, char *newpath)
{
FILE *pfr, *pfw;
pfr = fopen(oldpath, "rb");
pfw = fopen(newpath, "wb");//写入二进制模式
if (pfr == NULL || pfw == NULL)
{
fclose(pfr);//关闭文件
fclose(pfw);
return;
}
else
{
int length = getfilesize(oldpath);
char *p = (char *)malloc(length*sizeof(char));//分配内存，读取文件
fread(p, sizeof(char), length, pfr);//读取二进制到内存
fwrite(p, sizeof(char), length, pfw);//写入二进制到文件
fclose(pfr);//关闭文件
fclose(pfw);
}
}
void jia(char *oldpath, char *newpath)
{
FILE *pfr, *pfw;
pfr = fopen(oldpath, "rb");
pfw = fopen(newpath, "wb");//写入二进制模式
if (pfr == NULL || pfw == NULL)
{
fclose(pfr);//关闭文件
fclose(pfw);
return;
}
else
{
int length = getfilesize(oldpath);
char *p = (char *)malloc(length*sizeof(char));//分配内存，读取文件
fread(p, sizeof(char), length, pfr);//读取二进制到内存
for (int i = 0; i < length; i++)
{
p[i] ^= 'A';//抑或
}
fwrite(p, sizeof(char), length, pfw);//写入二进制到文件
fclose(pfr);//关闭文件
fclose(pfw);
}
}
void jie(char *oldpath, char *newpath)
{
FILE *pfr, *pfw;
pfr = fopen(oldpath, "rb");
pfw = fopen(newpath, "wb");//写入二进制模式
if (pfr == NULL || pfw == NULL)
{
fclose(pfr);//关闭文件
fclose(pfw);
return;
}
else
{
int length = getfilesize(oldpath);
char *p = (char *)malloc(length*sizeof(char));//分配内存，读取文件
fread(p, sizeof(char), length, pfr);//读取二进制到内存
for (int i = 0; i < length; i++)
{
p[i] ^= 'A';//解密
}
fwrite(p, sizeof(char), length, pfw);//写入二进制到文件
fclose(pfr);//关闭文件
fclose(pfw);
}
}
void main()
{
char *oldpath = "C:\\Users\\wuyq\\Desktop\\calc.exe";
char *newpath = "C:\\Users\\wuyq\\Desktop\\calc.exe";
char *newjiepath = "C:\\Users\\wuyq\\Desktop\\calc.exe";
jia(oldpath, newpath);
jie(newpath, newjiepath);
system("pause");
}
简单加密
#define _CRT_SECURE_NO_WARNINGS//关闭安全检查
#include<stdio.h>
#include<stdlib.h>
// 'a' ->'b'
//hello -> ifmmp
//textjjia.txt
//textjie.txt
//按照字节的方式加密
char jiami(char ch)
{
return ch ^ 123;
}
char jiemi(char ch)
{
return ch ^123;
}
void jia(char *path, char *pathjia)
{
FILE *pfr, *pfw;
pfr = fopen(path, "r");//读取
pfw = fopen(pathjia, "w");//写入
if (pfr == NULL || pfw == NULL)
{
return;
}
else
{
while (!feof(pfr))//到了文件末尾1，没有到就是0
{
char ch = fgetc(pfr);//读取字符
putchar(ch);
fputc(jiami(ch), pfw);//写入一个加密的字符
}
fclose(pfr);
fclose(pfw);//关闭文件
}
}
void jie(char *path, char *pathjie)
{
FILE *pfr, *pfw;
pfr = fopen(path, "r");//读取
pfw = fopen(pathjie, "w");//写入
if (pfr == NULL || pfw == NULL)
{
return;
}
else
{
while (!feof(pfr))//到了文件末尾1，没有到就是0
{
char ch = fgetc(pfr);//读取字符
putchar(ch);
fputc(jiemi(ch), pfw);//写入一个加密的字符
}
fclose(pfr);
fclose(pfw);//关闭文
}
}
void main()
{
char *path = "C:\\Users\\yincheng01\\Desktop\\text.txt";
char *pathjia = "C:\\Users\\yincheng01\\Desktop\\textjia.txt";
char *pathjie = "C:\\Users\\yincheng01\\Desktop\\textjie.txt";
jia(path, pathjia);
jie(pathjia, pathjie);
system("pause");
}
void main1()
{
FILE *pfr;
char *path = "C:\\Users\\yincheng01\\Desktop\\text.txt";
pfr = fopen(path, "r");
if (pfr == NULL)
{
printf("文件打开失败");
}
else
{
printf("\n原来的资料\n");
while (!feof(pfr))//feof没有到文件末尾返回0，到了返回1
{
char ch=fgetc(pfr);//从文件读取一个字符
putchar(ch);//输出字符
}
rewind(pfr);//回到文件开头
printf("\n加密后的资料\n");
while (!feof(pfr))//feof没有到文件末尾返回0，到了返回1
{
char ch = fgetc(pfr);//从文件读取一个字符
putchar(ch+1);//输出字符
}
fclose(pfr);//关闭文件
}
system("pause");
}
按照密码加密
#define _CRT_SECURE_NO_WARNINGS//关闭安全检查 #include<stdio.h> #include<stdlib.h> #include<string.h> //加密，按照密码 // 文件加密 // 字符串加密 char * stringjiami(char *password, char *string); //字符串解密 char * stringjiemi(char *password, char *jiastring); void filejiami(char *path, char *pathjia, char *password); void filejiemi(char *pathjia, char *pathjie, char *password);
#define _CRT_SECURE_NO_WARNINGS//关闭安全检查
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
//加密，按照密码
// 文件加密
// 字符串加密
char * stringjiami(char *password, char *string);
//字符串解密
char * stringjiemi(char *password, char *jiastring);
void filejiami(char *path, char *pathjia, char *password);
void filejiemi(char *pathjia, char *pathjie, char *password);
#include"密码加密.h"
int getfilesize(char * path)
{
FILE *pf = fopen(path, "r");
if (pf == NULL)
{
return -1;
}
else
{
fseek(pf, 0, SEEK_END);//文件末尾
int length = ftell(pf);
return length;//返回长度
}
}
char * stringjiami(char *password, char *string)
{
int passlength = strlen(password);//获取加密长度
int stringlength = strlen(string);//获取字符串长度
if (stringlength %passlength ==0)
{
int ci = stringlength /passlength;//循环次数
for (int i = 0; i < ci; i++)//循环次
{
for (int j =0 ; j < passlength; j++)//循环密码
{
string[passlength*i+j] ^= password[j];//异或加密
}
}
}
else
{
int ci = stringlength / passlength;//循环次数
for (int i = 0; i < ci; i++)//循环次
{
for (int j = 0; j < passlength; j++)//循环密码
{
string[passlength*i + j] ^= password[j];//异或加密
}
}
int lastlength = stringlength%passlength;//剩下的长度
for (int i = 0; i < lastlength; i++)
{
string[passlength*(stringlength/passlength)+i] ^= password[i];
}
}
return string;
}
//字符串解密
char * stringjiemi(char *password, char *jiastring)
{
int passlength = strlen(password);//获取加密长度
int stringlength = strlen(jiastring);//获取字符串长度
if (stringlength %passlength == 0)
{
int ci = stringlength / passlength;//循环次数
for (int i = 0; i < ci; i++)//循环次
{
for (int j = 0; j < passlength; j++)//循环密码
{
jiastring[passlength*i + j] ^= password[j];//异或加密
}
}
}
else
{
int ci = stringlength / passlength;//循环次数
for (int i = 0; i < ci; i++)//循环次
{
for (int j = 0; j < passlength; j++)//循环密码
{
jiastring[passlength*i + j] ^= password[j];//异或加密
}
}
int lastlength = stringlength%passlength;//剩下的长度
for (int i = 0; i < lastlength; i++)
{
jiastring[passlength*(stringlength / passlength) + i] ^= password[i];
}
}
return jiastring;
}
void filejiami(char *path, char *pathjia, char *password)
{
FILE *pfr,*pfw;
pfr = fopen(path, "r");
pfw = fopen(pathjia, "w");
if (pfr == NULL || pfw == NULL)
{
fclose(pfr);
fclose(pfw);
return;
}
else
{
int length = getfilesize(path);//获取长度 430
//int passlength = strlen(password);//获取密码20
char *newstr = (char*)malloc(sizeof(char)*(length+1));
for (int i = 0; i < length; i++)
{
char ch = fgetc(pfr);//获取一个字符
newstr[i] = ch;//不断存入字符
//fputc(newstr[i], pfw);//挨个写入字符
}
newstr[length] = '\0';//字符串处理为'\0'
stringjiami(password, newstr);//加密字符串
for (int i = 0; i < length ; i++)
{
fputc(newstr[i], pfw);//挨个写入字符
}
fclose(pfr);
fclose(pfw);//关闭文件
}
}
void filejiemi(char *pathjia, char *pathjie, char *password)
{
FILE *pfr, *pfw;
pfr = fopen(pathjia, "rb");
pfw = fopen(pathjie, "wb");
if (pfr == NULL || pfw == NULL)
{
fclose(pfr);
fclose(pfw);
return;
}
else
{
while (!feof(pfr))
{
char string[256] = { 0 };
fgets(string, 256, pfr);
stringjiemi(password, string);//加密啊
fputs(string, pfw);//写入jie密文件
}
fclose(pfr);
fclose(pfw);//关闭文件
}
}
#define _CRT_SECURE_NO_WARNINGS//关闭安全检查
#include<stdio.h>
#include<stdlib.h>
#include"密码加密.h"
void main()
{
char string[50] = "锄禾日当午";
char *password = "123";
printf("%s\n", stringjiami(password, string));
printf("%s\n", stringjiami(password, string));
char *path = "C:\\Users\\yincheng01\\Desktop\\text.txt";
char *pathjia = "C:\\Users\\yincheng01\\Desktop\\textjia.txt";
char *pathjie = "C:\\Users\\yincheng01\\Desktop\\textjie.txt";
//printf("%d\n", getfilesize(path));
filejiami(path, pathjia, "ABCDE");
filejiami(pathjia, pathjie, "ABCDE");
system("pause");
}
动态库与静态库
静态库
Lib.h
void msg(); int add(int a, int b);Lib.c
#include<stdio.h>
#include<stdlib.h>
#include<Windows.h>
void msg()
{
MessageBoxA(0, "1", "2", 0);
}
int add(int a, int b)
{
return a + b;
}
Main.c
#include<stdio.h>
#include<stdlib.h>
#include"lib.h"
#pragma comment(lib, "静态库与动态库.lib")
//头文件只是说明，lib自己已经存在接口
void main()
{
printf("%d", add(10, 9));
msg();
}
动态库
Dll.c
#include<stdio.h>
#include<stdlib.h>
#include<Windows.h>
//导出函数，可以加载的时候调用
_declspec(dllexport) void msg()
{
MessageBoxA(0, "1", "2", 0);
}
//导出函数，可以加载的时候调用
_declspec(dllexport) int add(int a, int b)
{
return a + b;
}
Main.c
#include<stdio.h>
#include<stdlib.h>
#include<Windows.h>
typedef void (*pmsg)();//简化函数指针
typedef int(*padd)(int a, int b);//简化函数指针
void main()
{
HMODULE mydll = LoadLibraryA("动态库.dll");
if (mydll == NULL)
{
printf("动态库加载失败");
}
else
{
pmsg pmsg1;//定义一个函数指针
pmsg1 = (pmsg)GetProcAddress(mydll, "msg");//获取函数地址
if (pmsg1 != NULL)
{
pmsg1();//执行
}
padd padd1;//定义函数指针
padd1 = (padd)GetProcAddress(mydll, "add");
if (padd1 != NULL)
{
printf("\n%d", padd1(10, 29));
}
}
FreeLibrary(mydll);
system("pause");
}