CN103971315A - Method for generating image verification codes - Google Patents
Method for generating image verification codes Download PDFInfo
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- CN103971315A CN103971315A CN201310035137.6A CN201310035137A CN103971315A CN 103971315 A CN103971315 A CN 103971315A CN 201310035137 A CN201310035137 A CN 201310035137A CN 103971315 A CN103971315 A CN 103971315A
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Abstract
The invention provides a method for generating image verification codes, and relates to the technical field of network application. The method includes the steps that characters are preset, wherein characters to be displayed on a canvas are self-defined in an array vitrine; a character string checkcode is generated, wherein a user requests to generate the verification codes, the length of the verification codes needing inputting is set, a system generates random numbers by calling rnd. Next (vitrine. Length-1), according to the generated random numbers, corresponding characters are found in the self-defined array vitrine, and the process of randomly generating random numbers is repeated until the number of the generated random numbers meets the length of the verification codes, needing inputting, set by the user; a blank image is created, wherein the size of a current font is set as fontsize, according to the fontsize and the length of the drawn character string, the blank image is created, Image=newBitmap ((int)Math,Ceiling (checkcode. Length * fontsize), 22), and an object Graphicsgr=Graphics. FromImage (Image) is generated according to the Image; the character string checkcode is drawn, wherein the character string is drawn by calling a gr. DrawStringde method; the verification codes are output, wherein the drawn character string checkcode is stored in Session, and the image is output on a webpage in a stream mode, Image. Save (Response. OutputStream, System. Drawing. Imaging. ImageFormat. Gif).
Description
Technical field
The present invention relates to network application technical field, be specifically related to a kind of generation method of picture validation code.
Background technology
Day by day universal along with computing machine and computer network, internet has been deep into the every field of people's work, studying and living.In current information and network times, it is more and more important that information security shows, in order to prevent that some unique user from utilizing robot (rogue program) auto registration, login automatically, malice to pour water and malice increases database access, with specific program Brute Force password, can adopt verification code technology.Current most of network information system has the function of picture validation code.A kind of method that this programme provides simple and fast to generate graphical verification code, and added the term of validity that checking generates.
Summary of the invention
The present invention proposes a kind of method of simple and fast generation graphical verification code, comprises the following steps:
Preset characters step, will be on painting canvas character to display self-defined in array vitrine;
The generation step of character string checkcode, user asks to generate identifying code, and the length l ength of identifying code that requires input is set, system produces random number by calling rnd.Next (vitrine.Length-1), in self-defined array vitrine, find out corresponding character according to produced random number, repeat above-mentioned random generation random number process, until the number of generation random number is satisfied with user, the length l ength that requires the identifying code of inputting is set;
Create blank image step, the size that current font is set is fontsize, create the blank image of a width according to the size of font with the length of drawn character string, Image=new Bitmap ((int) Math.Ceiling (checkcode.Length * fontsize), 22), according to a raw Graphics gr=Graphics.FromImage (Image) object of Image;
Draw character string checkcode step, call the method for gr.DrawStringde and draw character string;
The output step of identifying code, above-mentioned drawn character string checkconde is kept in Session, by picture with stream formal output to webpage, Image.Save (Response.OutputStream, System.Drawing.Imaging.ImageFormat.Gif).
After drawing the step of character string checkcode, comprise picture sheet interfering line step, create Random object rnd1, call method rnd1.Next (Image.Width) produces respectively two some x, y with rnd1.Next (Image.Heigth) at every turn.
After described picture sheet interfering line step, also comprise and add noise spot step, the method for calling image.SetPixel () produces random point, according to random point, noise spot is set.
After adding noise spot step, also comprise picture sheet frame step, call the method picture sheet frame of gr.DrawRectangle.
After the output step of identifying code, also comprise countdown step, in the time that picture outputs on webpage, start countdown, in the effective time of display end dynamic reminding user rs authentication code, in the time that countdown is 0, prompting user rs authentication code lost efficacy, and regenerated identifying code.
The generation method of a kind of picture validation code of the present invention's invention, realizes simple cost low, does not need other assemblies, technology maturation, and operating rate is high, has very high use value.
Brief description of the drawings
Fig. 1 is the generation method schematic diagram of a kind of picture validation code of inventing of the present invention.
Fig. 2 is the preferred schematic diagram of generation method of a kind of picture validation code of inventing of the present invention.
Embodiment
The generation method of a kind of picture validation code of the present invention's invention, its schematic diagram as shown in Figure 1, comprises the following steps,
Preset characters step, will be on painting canvas character to display self-defined in array vitrine;
User asks to generate identifying code, and the length l ength of the identifying code that requires input is set;
Create blank image step, the size that current font is set is fontsize, create the blank image of a width according to the size of font with the length of drawn character string, Image=new Bitmap ((int) Math.Ceiling (checkcode.Length * fontsize), 22), according to a raw Graphics gr=Graphics.FromImage (Image) object of Image;
System produces random number by calling rnd.Next (vitrine.Length-1), finds out corresponding character according to produced random number in self-defined array vitrine;
Draw character string checkcode step, call the method for gr.DrawStringde and draw character string;
Repeat above-mentioned random generation random number process, until the number of generation random number is satisfied with user, the length l ength that requires the identifying code of inputting is set;
The output step of identifying code, above-mentioned drawn character string checkconde is kept in Session, by picture with stream formal output to webpage, Image.Save (Response.OutputStream, System.Drawing.Imaging.ImageFormat.Gif).
The generation method of a kind of picture validation code of the present invention's invention, its preferred schematic diagram as shown in Figure 2, comprises the following steps:
Preset characters step, will be on painting canvas character to display self-defined in array vitrine;
User asks to generate identifying code, and the length l ength of the identifying code that requires input is set;
Create blank image step, the size that current font is set is fontsize, create the blank image of a width according to the size of font with the length of drawn character string, Image=new Bitmap ((int) Math.Ceiling (checkcode.Length * fontsize), 22), according to a raw Graphics gr=Graphics.FromImage (Image) object of Image;
System produces random number by calling rnd.Next (vitrine.Length-1), finds out corresponding character according to produced random number in self-defined array vitrine;
Draw character string checkcode step, call the method for gr.DrawStringde and draw character string;
Repeat above-mentioned random generation random number process, until the number of generation random number is satisfied with user, the length l ength that requires the identifying code of inputting is set;
Picture sheet interfering line step, creates Random object rnd1, and call method rnd1.Next (Image.Width) produces respectively two some x, y with rnd1.Next (Image.Heigth) at every turn;
Add noise spot step, the method for calling image.SetPixel () produces random point, according to random point, noise spot is set;
Picture sheet frame step, calls the method picture sheet frame of gr.DrawRectangle;
The output step of identifying code, above-mentioned drawn character string checkconde is kept in Session, by picture with stream formal output to webpage, Image.Save (Response.OutputStream, System.Drawing.Imaging.ImageFormat.Gif);
Countdown step, in the time that picture outputs on webpage, starts countdown, and in the effective time of display end dynamic reminding user rs authentication code, in the time that countdown is 0, prompting user rs authentication code lost efficacy, and regenerated identifying code.
Claims (5)
1. a generation method for picture validation code, is characterized in that, comprises the following steps:
Preset characters step, will be on painting canvas character to display self-defined in array vitrine;
The generation step of character string checkcode, user asks to generate identifying code, and the length l ength of identifying code that requires input is set, system produces random number by calling rnd.Next (vitrine.Length-1), in self-defined array vitrine, find out corresponding character according to produced random number, repeat above-mentioned random generation random number process, until the number of generation random number is satisfied with user, the length l ength that requires the identifying code of inputting is set;
Create blank image step, the size that current font is set is fontsize, create the blank image of a width according to the size of font with the length of drawn character string, Image=new Bitmap ((int) Math.Ceiling (checkcode.Length * fontsize), 22), according to a raw Graphics gr=Graphics.FromImage (Image) object of Image;
Draw character string checkcode step, call the method for gr.DrawStringde and draw character string;
The output step of identifying code, above-mentioned drawn character string checkconde is kept in Session, by picture with stream formal output to webpage, Image.Save (Response.OutputStream, System.Drawing.Imaging.ImageFormat.Gif).
2. the generation method of a kind of picture validation code as claimed in claim 1, it is characterized in that, after drawing the step of character string checkcode, comprise picture sheet interfering line step, create Random object rnd1, call method rnd1.Next (Image.Width) produces respectively two some x, y with rnd1.Next (Image.Heigth) at every turn.
3. the generation method of a kind of picture validation code as claimed in claim 2, it is characterized in that, after described picture sheet interfering line step, also comprise and add noise spot step, the method of calling image.SetPixel () produces random point, according to random point, noise spot is set.
4. the generation method of a kind of picture validation code as claimed in claim 3, is characterized in that, after adding noise spot step, also comprises picture sheet frame step, calls the method picture sheet frame of gr.DrawRectangle.
5. the generation method of a kind of picture validation code as claimed in claim 4, it is characterized in that, after the output step of identifying code, also comprise countdown step, in the time that picture outputs on webpage, start countdown, in the effective time of display end dynamic reminding user rs authentication code, in the time that countdown is 0, prompting user rs authentication code lost efficacy, and regenerated identifying code.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310035137.6A CN103971315A (en) | 2013-01-30 | 2013-01-30 | Method for generating image verification codes |
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| CN201310035137.6A CN103971315A (en) | 2013-01-30 | 2013-01-30 | Method for generating image verification codes |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104283884A (en) * | 2014-10-13 | 2015-01-14 | 宁波公众信息产业有限公司 | Verification code verification method |
| CN105824486A (en) * | 2015-01-07 | 2016-08-03 | 阿里巴巴集团控股有限公司 | Method and apparatus for displaying check codes |
| CN110808961A (en) * | 2019-10-16 | 2020-02-18 | 上海易点时空网络有限公司 | Data processing method and device for security verification |
-
2013
- 2013-01-30 CN CN201310035137.6A patent/CN103971315A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104283884A (en) * | 2014-10-13 | 2015-01-14 | 宁波公众信息产业有限公司 | Verification code verification method |
| CN105824486A (en) * | 2015-01-07 | 2016-08-03 | 阿里巴巴集团控股有限公司 | Method and apparatus for displaying check codes |
| CN105824486B (en) * | 2015-01-07 | 2019-02-05 | 阿里巴巴集团控股有限公司 | A kind of method and device showing check code |
| CN110808961A (en) * | 2019-10-16 | 2020-02-18 | 上海易点时空网络有限公司 | Data processing method and device for security verification |
| CN110808961B (en) * | 2019-10-16 | 2022-02-01 | 上海易点时空网络有限公司 | Data processing method and device for security verification |
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Application publication date: 20140806 |