C# 用C保存打印屏幕#

这是我打印屏幕按钮的代码。问题是，我按了几次按钮，它只写了旧的图像文件（printscreen.jpg），它不会创建另一个新的图像文件，如printscreen 1.jpg

试试这个。每次都会生成一个唯一的文件

Bitmap bitmap = new Bitmap(Screen.PrimaryScreen.Bounds.Width, 
                                    Screen.PrimaryScreen.Bounds.Height);
Graphics graphics = Graphics.FromImage(bitmap as Image);
graphics.CopyFromScreen(0, 0, 0, 0, bitmap.Size);
bitmap.Save(@"C:\Temp\printscreen.jpg", ImageFormat.Jpeg);

或

它不会创建另一个新的图像文件

您并不是要求它创建一个，而是您的代码

Bitmap bitmap = new Bitmap(Screen.PrimaryScreen.Bounds.Width, 
                                    Screen.PrimaryScreen.Bounds.Height);
Graphics graphics = Graphics.FromImage(bitmap as Image);
graphics.CopyFromScreen(0, 0, 0, 0, bitmap.Size);
var date = DateTime.Now.ToString("MMddyyHmmss");
bitmap.Save(@"C:\Temp\printscreen"+date+".jpg", ImageFormat.Jpeg);

总是写入同一个文件

新的图像文件，如printscreen1.jpg

如果要创建新文件，需要动态生成文件名。差不多

bitmap.Save(@"C:\Temp\printscreen.jpg", ImageFormat.Jpeg);

---

创建一个字段，如

计数器

和

增量

在每个

按钮上单击

并将其用作文件名-

 string fileName = System.IO.Path.GetTempPath() + DateTime.Now.ToString() + ".jpg";
 bitmap.Save(fileName, ImageFormat.Jpeg);

---

您可以计算以

printscreen

开头的目录中已经存在多少文件

bitmap.Save(@"C:\Temp\printscreen" + (counter++) + ".jpg", ImageFormat.Jpeg);

如果您有很多文件，这可能会比较慢，因为它必须遍历这些文件，但自动化程度更高

另一个选项是创建一个存储当前计数器编号的文件

int count =  Directory.EnumerateFiles(@"C:\Temp\").Where(x => x.StartsWith("printscreen")).Count();
bitmap.Save(String.Format(@"C:\Temp\printscreen{0}.jpg", count), ImageFormat.Jpeg);

然后，当您想在程序重新启动后启动计数器时，您可以这样做

File.Write("Counter.txt", counter.ToString());

---

当然，如果您不打算重新启动应用程序并继续执行序列，您可以避免将计数器存储在文本文件中，只需从零开始递增计数器。

您也可以这样尝试：

int counter = 0;
if(File.Exists("Counter.txt"))
   counter = Int32.Parse(File.ReadAllText("Counter.txt"));

bitmap.Save(String.Format(@"C:\Temp\printscreen{0}.jpg", ++counter), ImageFormat.Jpeg);

我认为，通过按降序排序来选择最后一个文件，而不是对它们进行枚举，效率会更高。此外，无需跟踪单独的计数器拾取最后一个计数并增加它

int number;
string[] path = Directory.GetFiles(@"C:\Temp\", @"PrintScreen*");

if (path.Length == 0)
{    bitmap.Save(@"C:\Temp\printscreen.jpg", ImageFormat.Jpeg); return;  }

Array.Sort(path);
Array.Reverse(path);

int.TryParse(Regex.Match(path[0], @"(\d+)(?=\.jpg)").ToString(), out number);
bitmap.Save(@"C:\Temp\printscreen" + (number + 1).ToString() + ".jpg", ImageFormat.Jpeg);

还有一种是SaveJPGWithCompressionSetting方法

                   {
                    //Application.DoEvents();
                    Bitmap printscreen = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
                    Graphics graphics = Graphics.FromImage(printscreen as Image);
                    graphics.CopyFromScreen(0, 0, 0, 0, printscreen.Size);
                    string path = "";
                    if (forLog)
                    {
                        path = LoggerPath + StudentNumber.ToString() + "\\" + SessionID.ToString() + "\\";
                    }
                    else
                    {
                        path = PrintScreenPath + StudentNumber.ToString() + "\\" + SessionID.ToString() + "\\";
                    }
                    if (!Directory.Exists(path))
                        Directory.CreateDirectory(path);
                    string fileName = DateTime.Now.Ticks.ToString();
                    SaveJPGWithCompressionSetting(printscreen, path + fileName + ".jpeg", 17L);
                    printscreen.Dispose();
                    graphics.Dispose();
                    return fileName;
                }

---

}

+1（又名“我和平归来”）使用当前日期而不是GUID如何？似乎更合适。如果你不告诉它，它肯定不会

                   {
                    //Application.DoEvents();
                    Bitmap printscreen = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
                    Graphics graphics = Graphics.FromImage(printscreen as Image);
                    graphics.CopyFromScreen(0, 0, 0, 0, printscreen.Size);
                    string path = "";
                    if (forLog)
                    {
                        path = LoggerPath + StudentNumber.ToString() + "\\" + SessionID.ToString() + "\\";
                    }
                    else
                    {
                        path = PrintScreenPath + StudentNumber.ToString() + "\\" + SessionID.ToString() + "\\";
                    }
                    if (!Directory.Exists(path))
                        Directory.CreateDirectory(path);
                    string fileName = DateTime.Now.Ticks.ToString();
                    SaveJPGWithCompressionSetting(printscreen, path + fileName + ".jpeg", 17L);
                    printscreen.Dispose();
                    graphics.Dispose();
                    return fileName;
                }

   private void SaveJPGWithCompressionSetting(Image image, string szFileName, long lCompression)
    {
            try
            {
                EncoderParameters eps = new EncoderParameters(1);
                eps.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, lCompression);
                ImageCodecInfo ici = GetEncoderInfo("image/jpeg");
                image.Save(szFileName, ici, eps);
            }