写了一个图像文件转二进制文件的小程序，可是有个很费解的问题
就是我将二进制文件转化成图像文件先没有保存，显示在PictureBox中 可以
但是直接取PictureBox中的图像文件转换成二进制文件 代码中
Bitmap.Save(ms, Bitmap.RawFormat)这句会报错：出现一般性的GDI问题，之前报错出现空值，但是bitmap和bitmap.RawFormat不为空啊
如果将二进制转化成的图像保存在硬盘中的图像文件中，读到PictureBox中，在转化成二进制文件却可以。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;
namespace IMGToBinary
{
class IMGToBinaryHelper
{
public static Bitmap BytesToBitmap(byte[] Bytes)
{
MemoryStream stream = null;
try
{
stream = new MemoryStream(Bytes);
return new Bitmap(stream);
}
catch (ArgumentNullException ex)
{
throw ex;
}
catch (ArgumentException ex)
{
throw ex;
}
finally
{
stream.Close();
}
}
public static byte[] BitmapToBytes(Bitmap Bitmap)
{
MemoryStream ms = null;
try
{
ms = new MemoryStream();
ImageFormat imageFormat = Bitmap.RawFormat;
Bitmap.Save(ms, Bitmap.RawFormat);
byte[] byteImage = new Byte[ms.Length];
byteImage = ms.ToArray();
return byteImage;
}
catch (Exception ex)
{
throw ex;
}
finally
{
ms.Close();
}
}
}
}
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Drawing.Imaging;
namespace IMGToBinary
{
public partial class MainForm : Form
{
public MainForm()
{
InitializeComponent();
}
private void BtnReadFile_Click(object sender, EventArgs e)
{
OpenFileDialog openFileDialog = new OpenFileDialog();
openFileDialog.Filter = "文本文件 (*.txt)|*.txt|图片文件 (*.jpg,*.jpeg,*.bmp,*.png)|" +
"*.jpg;*.jpeg;*.bmp;*.png|All files (*.*)|*.*";
if (openFileDialog.ShowDialog() == DialogResult.OK)
{
string fileName = openFileDialog.FileName;
TxtReadFile.Text = fileName;
string extension = Path.GetExtension(fileName);
switch (extension)
{
case ".txt":
case ".xml":
string text = File.ReadAllText(fileName, Encoding.Default);//执行了四布操作，打开，读取，关闭
//File.ReadAllLines();
RtbBinFile.Text = text;
break;
case ".jpg":
case ".bmp":
case ".png":
PicboxIMG.Image = new Bitmap(fileName);
break;
default:
MessageBox.Show("文件格式错误，可以选择jeg，bmp，png或者txt，xml文件");
break;
}
}
}
private void BtnIMGToBinary_Click(object sender, EventArgs e)
{
if (PicboxIMG.Image != null)
{
byte[] binaryIMG = IMGToBinaryHelper.BitmapToBytes((Bitmap)PicboxIMG.Image);
StringBuilder strBuilder = new StringBuilder();
if (binaryIMG != null)
{
for (int i = 0; i < binaryIMG.Length; i++)
{
strBuilder.Append(binaryIMG[i].ToString("X2"));
}
}
RtbBinFile.Text = strBuilder.ToString();
}
else
MessageBox.Show("图片文件不存在");
}
private void BtnBinaryToIMG_Click(object sender, EventArgs e)
{
if (RtbBinFile.Text != "")
{
string binaryFile = RtbBinFile.Text;
binaryFile = binaryFile.Replace(" ", "");
if ((binaryFile.Length % 2) != 0)
binaryFile += " ";
byte[] returnBytes = new byte[binaryFile.Length / 2];
for (int i = 0; i < returnBytes.Length; i++)
returnBytes[i] = Convert.ToByte(binaryFile.Substring(i * 2, 2), 16);
Bitmap image = IMGToBinaryHelper.BytesToBitmap(returnBytes);
PicboxIMG.Image = image;
}
else
MessageBox.Show("二进制文本文件不存在");
}
private void BtnSaveIMG_Click(object sender, EventArgs e)
{
if (PicboxIMG.Image != null)
{
SaveFileDialog saveFileDialog = new SaveFileDialog();
saveFileDialog.Filter = "图片文件 (*.jpg)|*.jpg|图片文件 (*.bmp)|*.bmp|图片文件 (*.png)|*.png|All files (*.*)|*.*";
if (saveFileDialog.ShowDialog() == DialogResult.OK)
{
string saveFile = saveFileDialog.FileName;
string extension = Path.GetExtension(saveFile);
switch(extension)
{
case ".jpg":
PicboxIMG.Image.Save(saveFile, ImageFormat.Jpeg);
break;
case ".bmp":
PicboxIMG.Image.Save(saveFile, ImageFormat.Bmp);
break;
case ".png":
PicboxIMG.Image.Save(saveFile, ImageFormat.Png);
break;
default:
break;
}
}
}
else
MessageBox.Show("没有图片文件");
}
private void BtnSaveBinary_Click(object sender, EventArgs e)
{
if (RtbBinFile.Text != "")
{
SaveFileDialog saveFileDialog = new SaveFileDialog();
saveFileDialog.Filter = "文本文件 (*.txt)|*.txt|All files (*.*)|*.*";
if (saveFileDialog.ShowDialog() == DialogResult.OK)
{
string saveFile = saveFileDialog.FileName;
FileStream fs = new FileStream(saveFile, FileMode.Create);
StreamWriter sw = new StreamWriter(fs);
sw.Write(RtbBinFile.Text);
sw.Close();
fs.Close();
}
}
else
MessageBox.Show("没有文本文件");
}
}
}
