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我设计了一个表单应用程序，它可以通过使用业务逻辑等更好地设计用于单元测试，但在这个阶段我不想更改我的代码。它是一个应用程序，它使用LSB algorithm执行隐写，从而将消息嵌入到图像中。我目前正在为button2 click event写一个单元测试。当按下button2时;它将从另外两个textboxes和一个picturebox的图像中获取文本并运行LSB algorithm。以下是测试功能。我为相关的textboxes创建测试值。当我运行测试时，我得到：System.NullReferenceException: Object reference not set to an instance of an object。这是否涉及object sender = null;EventArgs e = null;。或者我甚至有可能做什么？我必须诉诸于NUnitForms？我已经测试功能后增加button2_clic K：单元测试表单c＃
public void button2_ClickTest()
{
StegApp_Accessor target = new StegApp_Accessor();
// TODO: Initialize to an appropriate value
object sender = null; // TODO: Initialize to an appropriate value
EventArgs e = null; // TODO: Initialize to an appropriate value
target.textBox4.Text = "123456";
target.textBox5.Text = "test message";
target.button2_Click(sender, e);
//Assert.Inconclusive("A method that does not return a value cannot
// be verified.");
//target.textBox4.Text = "123456";
//target.textBox5.Text = "test message";
/*
if (target.textBox4.Text.Length > 6 || target.textBox4.Text.Length < 0)
{
Assert.Fail("Key is out of range");
}*/
//Assert.IsInstanceOfType(target.b1,typeof(byte[]));
if(target.b1.Length != target.temp4.Length)
{
Assert.Fail("B1 array does not have the correct lenght");
}
Assert.IsInstanceOfType(target.image1,typeof(Bitmap));
Assert.IsInstanceOfType(target.sb,typeof(StringBuilder));
if(target.sb.Length != target.tmp3.Length)
{
Assert.Fail("Issue with Stringbuilder sb. Lenght not equal to 'tmp3'!");
}
Assert.Equals(target.z,target.StringLenght);
Assert.Equals(target.c, target.textBox5.Text.Length);
}
`private void button2_Click(object sender, EventArgs e)
{
//int x1, y1, z = 0;
try
{
// Convert String Into Byte Array
//byte[] sourceData = System.Text.ASCIIEncoding.ASCII.GetBytes(a);
// Convert Each Byte Into A Binary String
//foreach (byte thisByte in sourceData)
// binaryString.Append(Convert.ToString(thisByte, 2));
while (!key)
{
if (textBox4.Text == "")
{
//b1 = ASCIIEncoding.ASCII.GetBytes(textBox5.Text);
key = false;
MessageBox.Show("Error, enter your six digit key!");
return;
}
else if (textBox4.Text.Length > 6)
{
MessageBox.Show("Error, Key too long, try again!");
return;
}
else
{
//temp4 = textBox4.Text[0] + textBox4.Text[1] + textBox4.Text[2] + textBox4.Text[3] + textBox4.Text[4] + textBox4.Text[5] + textBox5.Text;
c = textBox5.Text.Length;
temp5 = c.ToString();
if (c <= 9)
{
temp5 = "000" + temp5;
}
else if (c <= 99)
{
temp5 = "00" + temp5;
}
else if (c <= 999)
{
temp5 = "0" + temp5;
}
else if (c <= 9999)
{
}
else
{
MessageBox.Show("Message too long for this tool,try again");
return;
}
temp4 = textBox4.Text + temp5 + textBox5.Text;
b1 = ASCIIEncoding.ASCII.GetBytes(temp4);
key = true;
}
}
//byte[] b1 = ASCIIEncoding.ASCII.GetBytes(textBox5.Text);
//b1 = Encoding.Unicode.GetBytes(a);
//Create the array to be returned.
tmp2 = new string[b1.Length];
//Interate through each byte
for (int i = 0; i < b1.Length; i++)
{
int x = b1[i];
tmp = "";
while (true)
{
if ((x % 2) == 1)
{
tmp = "1" + tmp;
}
else
{
tmp = "0" + tmp;
}
x /= 2;
if (x < 1) break;
}
//Make sure the value is 8 chars long.
tmp2[i] = tmp.PadLeft(8, '0');
}
//string a="";
for (int i = 0; i < b1.Length; i++)
{
//a = tmp2[i];
tmp3 = tmp3 + tmp2[i];
}
if (key)
{
tmp3 = "00" + tmp3;
}
else
{
tmp3 = "10" + tmp3;
}
sb.Append(tmp3);
//temp5 = c.ToString();
//z= c+1;
StringLenght = sb.Length;
byte Mask0 = 254;
byte Mask1 = 1;
byte NewRed = 0, NewGreen = 0, NewBlue = 0;
// Loop through the images pixels to reset color.
for (x1 = 0, y1 = 0; x1 < image1.Width && z < StringLenght; x1++)
{
for (y1 = 0; y1 < image1.Height && z < StringLenght; y1++)
{
Color pixelColor = image1.GetPixel(x1, y1);
//byte NewRed, NewGreen, NewBlue;
if (sb[z] == '0')
{
NewRed = Convert.ToByte(pixelColor.R & Mask0);
Color newColor = Color.FromArgb(NewRed, pixelColor.G, pixelColor.B);
image1.SetPixel(x1, y1, newColor);
pixelColor = image1.GetPixel(x1, y1);
z++;
if (z == StringLenght)
{
break;
}
}
else
{
NewRed = Convert.ToByte(pixelColor.R | Mask1);
Color newColor = Color.FromArgb(NewRed, pixelColor.G, pixelColor.B);
image1.SetPixel(x1, y1, newColor);
pixelColor = image1.GetPixel(x1, y1);
z++;
if (z == StringLenght)
{
break;
}
}
if (sb[z] == '0')
{
NewGreen = Convert.ToByte(pixelColor.G & Mask0);
Color newColor = Color.FromArgb(pixelColor.R, NewGreen, pixelColor.B);
image1.SetPixel(x1, y1, newColor);
pixelColor = image1.GetPixel(x1, y1);
z++;
if (z == StringLenght)
{
break;
}
}
else
{
NewGreen = Convert.ToByte(pixelColor.G | Mask1);
Color newColor = Color.FromArgb(pixelColor.R, NewGreen, pixelColor.B);
image1.SetPixel(x1, y1, newColor);
pixelColor = image1.GetPixel(x1, y1);
z++;
if (z == StringLenght)
{
break;
}
}
if (sb[z] == '0')
{
NewBlue = Convert.ToByte(pixelColor.B & Mask0);
Color newColor = Color.FromArgb(pixelColor.R, pixelColor.G, NewBlue);
image1.SetPixel(x1, y1, newColor);
pixelColor = image1.GetPixel(x1, y1);
z++;
if (z == StringLenght)
{
break;
}
}
else
{
NewBlue = Convert.ToByte(pixelColor.B | Mask1);
Color newColor = Color.FromArgb(pixelColor.R, pixelColor.G, NewBlue);
image1.SetPixel(x1, y1, newColor);
pixelColor = image1.GetPixel(x1, y1);
z++;
if (z == StringLenght)
{
break;
}
}
//string binary1 = Convert.ToString(pixelColor.R, 2);
//char last1 = binary1[binary1.Length - 1];
}
}
MessageBox.Show("Message embedded");
//Color newColor = Color.FromArgb(NewRed, NewGreen, NewBlue);
//image1.SetPixel(x, y, newColor);
// Set the PictureBox to display the image.
//pictureBox1.Image = image1;
// Display the pixel format in Label1.
//label1.Text = "Pixel format: " + image1.PixelFormat.ToString();
}
catch (ArgumentException)
{
MessageBox.Show("There was an error." +
"Check the path to the image file.");
}
//pictureBox2.Image = image1;
//Byte[] buf = Encoding.Unicode.GetBytes(RetreivedMessage.ToString());
//Byte[] buf = Encoding.Unicode.GetBytes(RetreivedMessage.ToString());
//string result = System.Text.Encoding.Unicode.GetString(buf);
//String result = Encoding.Unicode.GetString(buf);
//StringBuilder r2 = new StringBuilder();
//foreach (Byte b in Encoding.Unicode.GetBytes(FinalRetreivedMessage))
//{
// r2.Append(Convert.ToString(b));
// }
//int v = 0;
//for (int i = 0; i < FinalRetreivedMessage.Length; i++)
// {
// v = v * 2 + (FinalRetreivedMessage[i] == '0' ? 0 : 1);
// }
//string result = v.ToString();
// copy the string as UTF-8 bytes.
// byte[] utf8Bytes = new byte[FinalRetreivedMessage.Length];
// for (int i = 0; i < FinalRetreivedMessage.Length; ++i)
// {
//Debug.Assert(0 <= utf8String[i] && utf8String[i] <= 255, "the char must be in byte's range");
// utf8Bytes[i] = (byte)FinalRetreivedMessage[i];
// }
//Encoding.UTF8.GetString(utf8Bytes, 0, utf8Bytes.Length);
// utf8Bytes = new byte[]{1,1,1,0,1,0,0,0};
// string result1 = Encoding.UTF8.GetString(utf8Bytes, 0, utf8Bytes.Length);
//string result1 = Encoding.UTF8.GetString(utf8Bytes);
// UTF8Encoding enc = new UTF8Encoding();
// string str = enc.GetString(utf8Bytes);
// Byte[] encodedBytes = enc.GetBytes(FinalRetreivedMessage);
// string message = encodedBytes.ToString();
// int count = FinalRetreivedMessage.Length/8;
// var bollox = new byte[count];
// for (int i = 0; i < count; i++)
// bollox[i] = Convert.ToByte(FinalRetreivedMessage.Substring(i * 8, 8), 2);
// var bollox1 = new byte[count];
//for (int i = 0; i < count; i++)
//bollox1[i] = Encoding.Unicode.GetBytes(FinalRetreivedMessage.Substring(i * 8, 8));
// string result2 = bollox.ToString();
// string result3 = enc.GetString(bollox);
// string result4 = System.Convert.ToString(bollox);
// string StringIWant = BitConverter.ToString(bollox);
// string result5 = BitConverter.ToString(encodedBytes);
// string result6 = BitConverter.ToString(utf8Bytes);
// string result7 = BitConverter.ToString(Encoding.Unicode.GetBytes(FinalRetreivedMessage));
// string result8 = System.Convert.ToString(Encoding.Unicode.GetBytes(FinalRetreivedMessage));
// string result9 = Encoding.Unicode.GetString(Encoding.Unicode.GetBytes(FinalRetreivedMessage));
// string result10 = Encoding.Default.GetString(Encoding.Unicode.GetBytes(FinalRetreivedMessage));
}`
在什么时候，你得到的异常？ –
不可能说，因为我们看不到实际抛出异常的代码。 – JDB
如果你用调试器单步测试，你会知道哪一行会抛出异常 –