1、首先打开VC++6.0；
2、选择文件，新建；
3、选择C++sourcefile新建一个空白文档；
4、声明头文件
#include
#include
#include
首先写个加密函数，算法就是简介里说的;
void?EncryptFile(FILE?*sfp,FILE?*dfp,char?pwd)
{
char?ch;
if(sfp==0||dfp==0)
{
printf("ERROR!\n");
return;
}
while((ch=fgetc(sfp))!=EOF)
{
if((ch>='a')&&(ch
{
ch=(ch-'a'+1)%26+'a';
ch=ch^pwd;
}
if((ch>='A')&&(ch
{
ch=(ch-'A'+1)%26+'A';
ch=ch^pwd;
}
fputc(ch,dfp);
}
}
写解密子函数：与加密的过程相反;
void?DecryptFile(FILE?*sfp,FILE?*dfp,char?pwd)
{
char?ch;
while((ch=fgetc(sfp))!=EOF)
{
if((ch>='a')&&(ch
{
ch=ch^pwd;
ch=(ch-'a'+25)%26+'a';
}
if((ch>='A')&&(ch
{
ch=ch^pwd;
ch=(ch-'A'+25)%26+'A';
}
fputc(ch,dfp);
}
}
输出函数，输出文件内容
void?OutputFile(FILE?*fp)
{
char?ch;
while((ch=fgetc(fp))!=EOF)
putchar(ch);
}
主函数，主要调用这几个函数
int?main()
{
/*用户输入的要加密的文件名*/
char?sfilename[20];
/*用户输入加密后保存的文件名*/
char?dfilename[20];
/*用来保存密码字符*/
char?pwd;
FILE?*sfp,*dfp;
printf("\nPlease?input?filename?to?be?encrypted:\n");
/*得到要加密的文件名*/
gets(sfilename);
/*得到加密后你要的文件名*/
printf("input?filename?to?save?the?encrypted?file:\n");
gets(dfilename);
/*得到加密字符*/
printf("Please?input?your?Password:\n");
//scanf("%c",&pwd);
pwd=getch();
/*屏幕以*来表示输入的加密字符*/
printf("*\n");
/*以只读方式打开要加密的文件*/
if((sfp=fopen(sfilename,"r"))==0)
{
printf("Can't?open?the?file?:%s\n",sfilename);
exit(0);
}
/*输出要加密的文件*/
printf("\nThe?the?text?of?file?to?be?encrypted?is:\n");
OutputFile(sfp);
/*建立加密后的文件*/
if((dfp=fopen(dfilename,"w+"))==0)
{
printf("Can't?open?or?create?the?file?:%s\n",dfilename);
//exit(0);
}
/*文件加密*/
fseek(sfp,0L,SEEK_SET);
EncryptFile(sfp,dfp,pwd);
printf("\n\nEncrypted?the?file?successfully!\n");
/*输出加密后的文件*/
printf("\nAfter?encrypting?the?text?of?file?is:\n");
fseek(dfp,0L,SEEK_SET);
OutputFile(dfp);
fclose(sfp);
fclose(dfp);
getch();
return?0;
}
匿名回答于2024-06-06 13:55:22
