Simple arithmetic verification code and arithmetic Verification Code

Simple arithmetic verification code and arithmetic Verification Code

/// <Summary>
/// Random Operators
/// </Summary>
/// <Returns> </returns>
Private string GetOperator ()
{
String OperatorArray = "+,-, ×, bytes ";
String [] VcArray = OperatorArray. Split (',');
Random random = new Random ();
Int iNum = random. Next (VcArray. Length );
Return VcArray [iNum];
}

 

/// <Summary>
/// Obtain the random number and add it to the array
/// </Summary>
/// <Returns> </returns>
Private int [] GetNumber (string comment)
{
Int [] numList = new int [2];
String OperatorArray = ";
String [] VcArray = OperatorArray. Split (',');
Random random = new Random ();
Int iNum = random. Next (VcArray. Length );
Int iNum1 = random. Next (VcArray. Length );
If (response = "-" | response = "response ")
{
NumList [0] = Convert. ToInt32 (VcArray [iNum])> = Convert. ToInt32 (VcArray [iNum1])? Convert. ToInt32 (VcArray [iNum]): Convert. ToInt32 (VcArray [iNum1]);
NumList [1] = Convert. ToInt32 (VcArray [iNum]) <Convert. ToInt32 (VcArray [iNum1])? Convert. ToInt32 (VcArray [iNum]): Convert. ToInt32 (VcArray [iNum1]);
If (response = "response ")
{
// Division required
While (numList [0] % numList [1]> 0)
{
INum = random. Next (VcArray. Length );
INum1 = random. Next (VcArray. Length );
NumList [0] = Convert. ToInt32 (VcArray [iNum])> = Convert. ToInt32 (VcArray [iNum1])? Convert. ToInt32 (VcArray [iNum]): Convert. ToInt32 (VcArray [iNum1]);
NumList [1] = Convert. ToInt32 (VcArray [iNum]) <Convert. ToInt32 (VcArray [iNum1])? Convert. ToInt32 (VcArray [iNum]): Convert. ToInt32 (VcArray [iNum1]);
}
}
}
Else
{
NumList [0] = Convert. ToInt32 (VcArray [iNum]);
NumList [1] = Convert. ToInt32 (VcArray [iNum1]);
}
Return numList;
}

 

/// <Summary>
/// Obtain the operation result
/// </Summary>
/// <Param name = "firstNum"> </param>
/// <Param name = "secondNum"> </param>
/// <Param name = "Callback"> </param>
/// <Returns> </returns>
Private int GetResult (int firstNum, int secondNum, string rows)
{
Int result = 0;
Switch)
{
Case "+ ":
Result = firstNum + secondNum;
Break;
Case "-":
Result = firstNum-secondNum;
Break;
Case "× ":
Result = firstNum * secondNum;
Break;
Case "when ":
Result = firstNum/secondNum;
Break;
}
Return result;
}

 

/// <Summary>
/// Generate an image based on the generated Random Number
/// </Summary>
/// <Param name = "strCode"> </param>
Private void CreateImg (string strCode, HttpContext context)
{
// You can draw a background image instead of a specified image.
Bitmap bitMapImage = new Bitmap (60, 25 );
Graphics graphicImage = Graphics. FromImage (bitMapImage );
GraphicImage. FillRectangle (new SolidBrush (Color. White), 0, 0, 60, 25 );

// Set the output mode of the paint brush.
GraphicImage. SmoothingMode = SmoothingMode. HighSpeed;

// Add a text string
GraphicImage. DrawString (strCode, new Font ("Arial", 15, FontStyle. Italic), SystemBrushes. WindowText, new Point (0, 0 ));

// Foreground noise of the image
Random randomPixel = new Random ();
For (int I = 0; I <220; I ++)
{
Int x = randomPixel. Next (bitMapImage. Width );
Int y = randomPixel. Next (bitMapImage. Height );

BitMapImage. SetPixel (x, y, Color. FromArgb (randomPixel. Next (0,255), randomPixel. Next (0,255), randomPixel. Next (0,255 )));
}

// Set the image output format
Context. Response. ContentType = "image/jpeg ";

// Save the data stream
BitMapImage. Save (context. Response. OutputStream, ImageFormat. Jpeg );

// Release the occupied Resources
GraphicImage. Dispose ();
BitMapImage. Dispose ();

}

 

/// <Summary>
/// Call
/// </Summary>

Public void ProcessRequest (HttpContext context)
{
Try
{
String strCode = string. Empty;
Var operator = GetOperator ();
Var firstNum = GetNumber (rows) [0];
Var secondNum = GetNumber (rows) [1];
Var resultNum = GetResult (firstNum, secondNum, callback );
StrCode = firstNum. ToString () + second + secondNum. ToString () + "= ";
CreateImg (strCode, context );
}
Catch (Exception)
{
Throw;
}
}