private void button1_Click(object sender, EventArgs e)
{
//打開文件
OpenFileDialog open = new OpenFileDialog();
open.Filter = "jpeg圖片文件|*.jpg";
if (open.ShowDialog() != DialogResult.OK)
return;
string filePath = open.FileName;
//打開圖片，顯示原始圖
Image img = Image.FromFile(filePath);
sourcePicturebox.Image =img ;
//再次讀取一次圖潘
Bitmap bitmap = new Bitmap(img);
//鎖定圖片處理區域
Rectangle rect = new Rectangle(0, 0, bitmap.Width, bitmap.Height);
BitmapData bmpData = bitmap.LockBits(rect, ImageLockMode.ReadWrite, bitmap.PixelFormat);
//初始化字符串數組
string[] str = new string[bitmap.Height];
//不安全代碼塊
unsafe
{
//獲取首指針
byte* ptr = (byte*)(bmpData.Scan0);
for (int height = 0; height < bmpData.Height; height++)
{
//由于測試圖片是32RGB圖，所以，ptr一次移動四位
for (int width = 0; width < bmpData.Width; width++,ptr+=4)
{
str[height] += ((byte)(0.333 * ptr[0] + 0.333 * ptr[1] + 0.333 * ptr[2])) > 128 ? "*" : " ";
}
//為防止圖片數據占用不為4的倍數，所以這里用stride，跳過多余的字節
ptr += bmpData.Stride - bmpData.Width * 4;
}
}
//圖片解鎖
bitmap.UnlockBits(bmpData);
//初始化打印字符參數，以及新建一個空白圖片
//空白圖片大小。。。。。測試得到的。后續改進
Font font=new System.Drawing.Font ("宋體",20.5f);
Bitmap resultBitmap = new Bitmap(img.Width * 14, img.Height * 14);
Graphics graphics = Graphics.FromImage(resultBitmap);
graphics.Clear(Color.White);
SolidBrush brush=new SolidBrush(Color.Black);
//打印字符，一次一行
for (int i = 0; i < img.Height; i++)
{
graphics.DrawString(str[i], font, brush,0,i*14);
}
//MessageBox.Show(font.GetHeight().ToString());
resultPicturebox.Image = resultBitmap;
//文件保存
SaveFileDialog saveDialog = new SaveFileDialog();
saveDialog.Filter = "jpeg圖片文件|*.jpg";
if(saveDialog.ShowDialog()==DialogResult.OK)
resultBitmap.Save(saveDialog.FileName, ImageFormat.Jpeg);
}