显示图像 [英] Displaying image
问题描述
嗨
我正在尝试使用以下代码在对话框中显示图像;
Dim frm As new frmImage
Dim z As System.Drawing.Bitmap
z.FromFile（" c：\ temp\image.gif"）
frm.picImage.Image = z
frm.ShowDialog（）
frm.Dispose（）
麻烦就是那个对话框中不显示任何图像。我做错了什么？
谢谢
问候
PS：picImage是一个PictureBox。
" John" <乔** @ nospam.infovis.co.uk>在留言中写道
新闻：Ox ************** @ TK2MSFTNGP09.phx.gbl ...嗨
我正在尝试使用以下代码在对话框中显示图像;
Dim frm As New frmImage
Dim z As System.Drawing.Bitmap
z.FromFile（" c：\ temp\image.gif"）
frm.picImage.Image = z
frm.ShowDialog（）
frm.Dispose（）
麻烦的是对话框中没有图像出现。我做错了什么？
感谢
" John" ; <乔** @ nospam.infovis.co.uk>在新闻中写道：OxEaex3kDHA.1284
@ TK2MSFTNGP09.phx.gbl：我试图使用以下代码在对话框中显示图像;
Dim frm As new frmImage
Dim z As System.Drawing.Bitmap
z.FromFile（" c：\ temp\ image.gif"）
frm.picImage.Image = z
frm.ShowDialog（）
frm.Dispose（）
麻烦的是对话框中没有图像出现。我做错了什么？
我认为你并没有表明编译器是什么？b $ b如果你真的失败了意思是
z = Image.FromFile（" c：\ temp\image.gif"）;
但还有另一个错误。我认为你的文件名中有你的
反斜杠的问题......一般情况下，你应该在使用之前检查
变量。在调用FromFile（）之后，我会把'z''
的假设付出来。要解决此问题，请将以下任一行替换为
：
z = Image.FromFile（@c：\ temp \ image.gif） ;
（@告诉编译器不要解释''\''字符），或者
z = Image.FromFile（ c：\\temp\\mage.gif"）
-mbray
Evening John ，
在Image = z行上放置一个断点并检查z的值。你会发现它没什么。
z.FromFile（）正在调用< shared>方法。它与调用
Bitmap.FromFile（..）相同。换句话说，它不会（不能）改变z。
您需要的是：
Dim z As System.Drawing。位图
z = Bitmap.FromFile（" c：\ temp\image.gif"）
或简单地
Dim z As New System.Drawing.Bitmap（" c：\ temp \ image.gif"）
问候，
Fergus
Hi
I am trying to display an image in a dialog using the following code;
Dim frm As New frmImage
Dim z As System.Drawing.Bitmap
z.FromFile("c:\temp\image.gif")
frm.picImage.Image = z
frm.ShowDialog()
frm.Dispose()
Trouble is that no image appears in the dialog. What am I doing wrong?
Thanks
Regards
PS: picImage is a PictureBox.
"John" <jo**@nospam.infovis.co.uk> wrote in message
news:Ox**************@TK2MSFTNGP09.phx.gbl...Hi
I am trying to display an image in a dialog using the following code;
Dim frm As New frmImage
Dim z As System.Drawing.Bitmap
z.FromFile("c:\temp\image.gif")
frm.picImage.Image = z
frm.ShowDialog()
frm.Dispose()
Trouble is that no image appears in the dialog. What am I doing wrong?
Thanks
Regards
"John" <jo**@nospam.infovis.co.uk> wrote in news:OxEaex3kDHA.1284
@TK2MSFTNGP09.phx.gbl:I am trying to display an image in a dialog using the following code;
Dim frm As New frmImage
Dim z As System.Drawing.Bitmap
z.FromFile("c:\temp\image.gif")
frm.picImage.Image = z
frm.ShowDialog()
frm.Dispose()
Trouble is that no image appears in the dialog. What am I doing wrong?
I presume from the fact that you aren''t indicating that the compiler is
failing that you really mean
z = Image.FromFile("c:\temp\image.gif");
but there is another error. I think you are having a problem with your
backslashes in the filename... In general, you should always check a
variable before you use it. I would put money of the supposition that ''z''
is null after the call to FromFile(). To FIX the problem replace the line
with either:
z = Image.FromFile(@"c:\temp\image.gif");
(the @ tells the compiler not to interpret the ''\'' characters), OR
z = Image.FromFile("c:\\temp\\image.gif");
-mbray
Evening John,
Put a breakpoint on the Image = z line and check the value of z. You''ll
find that it''s Nothing.
z.FromFile() is calling a <shared> method. It''s the same as calling
Bitmap.FromFile(..). In other words it doesn''t (can''t) change z.
What you need is either:
Dim z As System.Drawing.Bitmap
z = Bitmap.FromFile("c:\temp\image.gif")
or simply
Dim z As New System.Drawing.Bitmap ("c:\temp\image.gif")
Regards,
Fergus
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