密码输入,用***代替,可删除***,验证码的随机生成,包括大写字母,小写字母,数字.

本文介绍了一个简单的C语言程序,该程序实现了密码输入隐藏及验证码功能。通过getch()获取密码输入并以星号显示,使用随机数生成包含大小写字母与数字的验证码,并通过字符串比较验证用户输入。

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#include<stdlib.h>
#include<time.h>
#include<stdio.h>
#include<string.h>
#include<conio.h>

char *password()
{
	char a[10], i;
	for(i=0; ; )
	{
		a[i] = getch();
		if(a[i] == 8)
		{
			printf("\b \b");
			i--;
		}
		else
			if(a[i] == 13)
		{
			a[i] ='\0';
			break;
		}
		else
		{
			putchar('*');
		i++;
		}
	}
	return a;
}


void check()
{
	char s1[5], s2[5];
	int i, m, n;
	srand( (unsigned)time(NULL) );
	
	do
	{
		for(i=0; i<4; i++)
			{
				m = rand()%3; //设定验证码中数字与字母比例为1:2.
				if(m==0)
				{
					n = rand()%10; //0~~9
					s1[i] = '0'+n ;
				}
				else
				{
					m=rand()%2;	//设定大写字母与小写字母为1:1.

					n=rand()%26;//0~25
					if(m==0)
					s1[i] = 'a'+n;
					else
					s1[i] = 'A'+n;
				}
			}

			s1[i] = '\0';
			puts(s1);
			printf("\n");
		    fflush(stdin);
		    gets(s2);

			if( !strcmp(s1, s2))
			{
			printf("验证码正确,登陆成功!\n");
			break;
			}
			else
				printf("\n验证码错误,请重新输入以下验证码:\n\n");
	}while( strcmp(s1, s2) );

}

int main()
{
	char *s;
	printf("请输入密码( 密码长度小于10 ):\n\n");
	s = password();
	while( strcmp(s, "123456") )
	{
		printf("\n\n密码错误,请再次输入密码:\n\n");
		s = password();
	}

	printf("\n请输入以下验证码:\n\n");
	check();
	return 0;
}








随机生成6位图片验证码. /// <summary> /// PicHandler1 的摘要说明 /// </summary> public class PicHandler1 : IHttpHandler, IRequiresSessionState { private string mCheckNo = string.Empty; protected ImgBuilder _ImgBuilder = new ImgBuilder(); protected VryImgGen _ImgBuilderNew = new VryImgGen(); private string _text = string.Empty; private string _font = "宋体"; private int _fontSize = 8; private int _padding = 2; public void ProcessRequest(HttpContext context) { mCheckNo = DisCheckNo(); context.Session["CheckCode"] = mCheckNo; this._ImgBuilder.FontSize = this._fontSize; this._ImgBuilder.Padding = this._padding; if (!string.IsNullOrEmpty(this._font)) { this._ImgBuilder.Fonts = new string[] { this._font }; } this._ImgBuilderNew.ChaosWight = 40; this._ImgBuilderNew.FontSize = 25; this._ImgBuilderNew.Padding = 3; System.Drawing.Bitmap image = this._ImgBuilderNew.CreateImage(mCheckNo); System.IO.MemoryStream ms = new System.IO.MemoryStream(); image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg); context.Response.ClearContent(); context.Response.ContentType = "image/Jpeg"; context.Response.BinaryWrite(ms.ToArray()); context.Session["CheckCode"] = mCheckNo.ToString(); //如果没有实现IRequiresSessionState,则这里会出错,也无法生成图片 context.Response.End(); } //验证码生成 protected string DisCheckNo() { string hash = HashCode.GetNext(); string CheckNo = string.Empty; Random rd = new Random(DateTime.Now.Millisecond); for (int i = 0; i < 6; i++) { CheckNo += hash.Substring(rd.Next(1, hash.Length - 1), 1); } CheckNo = CheckNo.Replace("0", rd.Next(1, 9).ToString()); CheckNo = CheckNo.Replace("o", rd.Next(1, 9).ToString());
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