c winform to get a captcha on a web page

It's a bit complicated, isn't it? The captcha mechanism of each ** is different, you don't have a clear goal, you can't tell you, and you don't give points, it's too stingy.

Just use a local update. Write the ** that generates the verification code on an aspx page, write it out, and then write the address of the page where the verification code is generated in the url of the verification code on this page, so that clicking is equivalent to refreshing the verification code asynchronously.

Click on the pictrue box and click on the event on the right side of the property to find the click event.

Double-click to enter. Paste **.

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You re-instantiate the validcode in the click event and call the createcheckcodeimage() method. Or encapsulate the place where the captcha is displayed when you log in into a method, and then call this method in the **click event.

Determine whether the content of the text box control is empty Determine whether the username and password are consistent in the database on messageboxshow();pop up what there are no words; What pops up.

Use the webbrowser control to get the source of a web page, which is simple and convenient.

string s=;Can!

EOF is an abbreviation for End of File, which denotes:"Text flow"(stream). Here"Text flow", which can be either a file or a stdin. Annihilation.

eof is not a special character, but a constant defined in the header, usually equal to -1. #define eof (-1)

In addition to representing the end of the file, EOF can also represent the end of a standard input. However, standard input is not the same as a file, and the length of the input cannot be known in advance, so you must manually enter a character to indicate the arrival of EOF.

The easiest way is to do n verification codes, each corresponding to the corresponding value value, verification only needs to verify whether the input characters and value are the same.

Attached is a captcha case I wrote myself, see if it's what you want. Double-click to refresh the code. See ** attachment for the effect and ** attachment for the source code. Source code attachments are free**, and since they are shared, they must be free. If there is a problem, hi me can be.