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dotnet drawing api
group:Graphics.TextRenderingHint throw exception?
dotnet drawing api:
Under some cases Graphics.TextRenderingHint and also Graphics.Save throws an
exception? I can't seem to understand why. or what I'm doing wrong? and the error message is useless. Anyone know whats going on? Thanks Schneider
Can you post an example of when this occurs?
-- -- Bob Powell [MVP] Visual C#, System.Drawing Ramuseco Limited .NET consulting http://www.ramuseco.com Find great Windows Forms articles in Windows Forms Tips and Tricks http://www.bobpowell.net/tipstricks.htm Answer those GDI+ questions with the GDI+ FAQ http://www.bobpowell.net/faqmain.htm All new articles provide code in C# and VB.NET. Subscribe to the RSS feeds provided and never miss a new article. [quoted text, click to view] "schneider" <eschneider@ooooooooo.com> wrote in message
news:OJ1JATweIHA.3724@TK2MSFTNGP02.phx.gbl... > Under some cases Graphics.TextRenderingHint and also Graphics.Save throws > an exception? > > I can't seem to understand why. or what I'm doing wrong? and the error > message is useless. > > Anyone know whats going on? > > Thanks > Schneider >
I can, just don't think it will help much:
Friend Function CalculateStringSize(ByVal canvas As Graphics) As Size If canvas Is Nothing Then Throw New ArgumentNullException("canvas", m_StringManager.GetString("nonullallowed", System.Globalization.CultureInfo.CurrentUICulture)) If Font Is Nothing Then Throw New ArgumentNullException("font", m_StringManager.GetString("nonullallowed", System.Globalization.CultureInfo.CurrentUICulture)) 'Dim gstate As GraphicsState = canvas.Save Dim ct As TextRenderingHint = canvas.TextRenderingHint canvas.TextRenderingHint = TextRenderingHint.ClearTypeGridFit Dim sz As SizeF = canvas.MeasureString(Me.Text, Font) sz.Width = sz.Width + CSng(sz.Width * 0.0125) + 1 '0.0125) 'canvas.Restore(gstate) canvas.TextRenderingHint = ct Dim s As New Size(CInt(sz.Width), CInt(sz.Height)) Return s End Function [quoted text, click to view] "Bob Powell [MVP]" <bob@spamkillerbobpowell.net> wrote in message news:87386324-AFC5-4C6F-84B1-C0104F40D202@microsoft.com... > Can you post an example of when this occurs? > > -- > -- > Bob Powell [MVP] > Visual C#, System.Drawing > > Ramuseco Limited .NET consulting > http://www.ramuseco.com > > Find great Windows Forms articles in Windows Forms Tips and Tricks > http://www.bobpowell.net/tipstricks.htm > > Answer those GDI+ questions with the GDI+ FAQ > http://www.bobpowell.net/faqmain.htm > > All new articles provide code in C# and VB.NET. > Subscribe to the RSS feeds provided and never miss a new article. > > > "schneider" <eschneider@ooooooooo.com> wrote in message > news:OJ1JATweIHA.3724@TK2MSFTNGP02.phx.gbl... >> Under some cases Graphics.TextRenderingHint and also Graphics.Save throws >> an exception? >> >> I can't seem to understand why. or what I'm doing wrong? and the error >> message is useless. >> >> Anyone know whats going on? >> >> Thanks >> Schneider >> >
I should note the code usualy works. I must do something to graphics which
causes the problem. Schneider [quoted text, click to view] "Bob Powell [MVP]" <bob@spamkillerbobpowell.net> wrote in message news:87386324-AFC5-4C6F-84B1-C0104F40D202@microsoft.com... > Can you post an example of when this occurs? > > -- > -- > Bob Powell [MVP] > Visual C#, System.Drawing > > Ramuseco Limited .NET consulting > http://www.ramuseco.com > > Find great Windows Forms articles in Windows Forms Tips and Tricks > http://www.bobpowell.net/tipstricks.htm > > Answer those GDI+ questions with the GDI+ FAQ > http://www.bobpowell.net/faqmain.htm > > All new articles provide code in C# and VB.NET. > Subscribe to the RSS feeds provided and never miss a new article. > > > "schneider" <eschneider@ooooooooo.com> wrote in message > news:OJ1JATweIHA.3724@TK2MSFTNGP02.phx.gbl... >> Under some cases Graphics.TextRenderingHint and also Graphics.Save throws >> an exception? >> >> I can't seem to understand why. or what I'm doing wrong? and the error >> message is useless. >> >> Anyone know whats going on? >> >> Thanks >> Schneider >> >
There is a lot of code and I can only reproduce it through a set of mouse
sequences. I think maybe the graphics has been disposed, but can't be sure. Seems strange the thow an error reading a property. Every property in graphics says "Invalid parameter value". What parameter? it craps out on: Graphics.TextRenderingHint or Graphics.Save [quoted text, click to view] "Bob Powell [MVP]" <bob@spamkillerbobpowell.net> wrote in message news:87386324-AFC5-4C6F-84B1-C0104F40D202@microsoft.com... > Can you post an example of when this occurs? > > -- > -- > Bob Powell [MVP] > Visual C#, System.Drawing > > Ramuseco Limited .NET consulting > http://www.ramuseco.com > > Find great Windows Forms articles in Windows Forms Tips and Tricks > http://www.bobpowell.net/tipstricks.htm > > Answer those GDI+ questions with the GDI+ FAQ > http://www.bobpowell.net/faqmain.htm > > All new articles provide code in C# and VB.NET. > Subscribe to the RSS feeds provided and never miss a new article. > > > "schneider" <eschneider@ooooooooo.com> wrote in message > news:OJ1JATweIHA.3724@TK2MSFTNGP02.phx.gbl... >> Under some cases Graphics.TextRenderingHint and also Graphics.Save throws >> an exception? >> >> I can't seem to understand why. or what I'm doing wrong? and the error >> message is useless. >> >> Anyone know whats going on? >> >> Thanks >> Schneider >> >
Was think of writing some kind of generic wrapper to see if i am disposing
it too early... Thanks, for the help, and I'm still waiting for you to publish a book on ..NET Drawing... Thanks again, Schneider [quoted text, click to view] "Bob Powell [MVP]" <bob@spamkillerbobpowell.net> wrote in message news:6DF1B4BF-96D7-4FEB-995E-38C3E161107C@microsoft.com... > Disposing the graphics is a common problem. You'll need to check your > code carefully. > > -- > -- > Bob Powell [MVP] > Visual C#, System.Drawing > > Ramuseco Limited .NET consulting > http://www.ramuseco.com > > Find great Windows Forms articles in Windows Forms Tips and Tricks > http://www.bobpowell.net/tipstricks.htm > > Answer those GDI+ questions with the GDI+ FAQ > http://www.bobpowell.net/faqmain.htm > > All new articles provide code in C# and VB.NET. > Subscribe to the RSS feeds provided and never miss a new article. > > > "schneider" <eschneider.news.ms@starkinvestments.com> wrote in message > news:Obv5zTUfIHA.4164@TK2MSFTNGP05.phx.gbl... >> There is a lot of code and I can only reproduce it through a set of mouse >> sequences. >> I think maybe the graphics has been disposed, but can't be sure. Seems >> strange the thow an error reading a property. Every property in graphics >> says "Invalid parameter value". What parameter? >> >> it craps out on: >> >> Graphics.TextRenderingHint >> >> or >> >> Graphics.Save >> >> >> >> >> "Bob Powell [MVP]" <bob@spamkillerbobpowell.net> wrote in message >> news:87386324-AFC5-4C6F-84B1-C0104F40D202@microsoft.com... >>> Can you post an example of when this occurs? >>> >>> -- >>> -- >>> Bob Powell [MVP] >>> Visual C#, System.Drawing >>> >>> Ramuseco Limited .NET consulting >>> http://www.ramuseco.com >>> >>> Find great Windows Forms articles in Windows Forms Tips and Tricks >>> http://www.bobpowell.net/tipstricks.htm >>> >>> Answer those GDI+ questions with the GDI+ FAQ >>> http://www.bobpowell.net/faqmain.htm >>> >>> All new articles provide code in C# and VB.NET. >>> Subscribe to the RSS feeds provided and never miss a new article. >>> >>> >>> "schneider" <eschneider@ooooooooo.com> wrote in message >>> news:OJ1JATweIHA.3724@TK2MSFTNGP02.phx.gbl... >>>> Under some cases Graphics.TextRenderingHint and also Graphics.Save >>>> throws an exception? >>>> >>>> I can't seem to understand why. or what I'm doing wrong? and the error >>>> message is useless. >>>> >>>> Anyone know whats going on? >>>> >>>> Thanks >>>> Schneider >>>> >>> >> >> >
Some sort of compilable code that reproduces the problem will help to find
an answer. -- -- Bob Powell [MVP] Visual C#, System.Drawing Ramuseco Limited .NET consulting http://www.ramuseco.com Find great Windows Forms articles in Windows Forms Tips and Tricks http://www.bobpowell.net/tipstricks.htm Answer those GDI+ questions with the GDI+ FAQ http://www.bobpowell.net/faqmain.htm All new articles provide code in C# and VB.NET. Subscribe to the RSS feeds provided and never miss a new article. [quoted text, click to view] "schneider" <eschneider@ooooooooo.com> wrote in message
news:OeweN%23LfIHA.1164@TK2MSFTNGP02.phx.gbl... >I can, just don't think it will help much: > > Friend Function CalculateStringSize(ByVal canvas As Graphics) As Size > > If canvas Is Nothing Then Throw New ArgumentNullException("canvas", > m_StringManager.GetString("nonullallowed", > System.Globalization.CultureInfo.CurrentUICulture)) > > If Font Is Nothing Then Throw New ArgumentNullException("font", > m_StringManager.GetString("nonullallowed", > System.Globalization.CultureInfo.CurrentUICulture)) > > 'Dim gstate As GraphicsState = canvas.Save > > Dim ct As TextRenderingHint = canvas.TextRenderingHint > > canvas.TextRenderingHint = TextRenderingHint.ClearTypeGridFit > > Dim sz As SizeF = canvas.MeasureString(Me.Text, Font) > > sz.Width = sz.Width + CSng(sz.Width * 0.0125) + 1 '0.0125) > > 'canvas.Restore(gstate) > > canvas.TextRenderingHint = ct > > Dim s As New Size(CInt(sz.Width), CInt(sz.Height)) > > Return s > > End Function > > > > "Bob Powell [MVP]" <bob@spamkillerbobpowell.net> wrote in message > news:87386324-AFC5-4C6F-84B1-C0104F40D202@microsoft.com... >> Can you post an example of when this occurs? >> >> -- >> -- >> Bob Powell [MVP] >> Visual C#, System.Drawing >> >> Ramuseco Limited .NET consulting >> http://www.ramuseco.com >> >> Find great Windows Forms articles in Windows Forms Tips and Tricks >> http://www.bobpowell.net/tipstricks.htm >> >> Answer those GDI+ questions with the GDI+ FAQ >> http://www.bobpowell.net/faqmain.htm >> >> All new articles provide code in C# and VB.NET. >> Subscribe to the RSS feeds provided and never miss a new article. >> >> >> "schneider" <eschneider@ooooooooo.com> wrote in message >> news:OJ1JATweIHA.3724@TK2MSFTNGP02.phx.gbl... >>> Under some cases Graphics.TextRenderingHint and also Graphics.Save >>> throws an exception? >>> >>> I can't seem to understand why. or what I'm doing wrong? and the error >>> message is useless. >>> >>> Anyone know whats going on? >>> >>> Thanks >>> Schneider >>> >> > >
Disposing the graphics is a common problem. You'll need to check your code
carefully. -- -- Bob Powell [MVP] Visual C#, System.Drawing Ramuseco Limited .NET consulting http://www.ramuseco.com Find great Windows Forms articles in Windows Forms Tips and Tricks http://www.bobpowell.net/tipstricks.htm Answer those GDI+ questions with the GDI+ FAQ http://www.bobpowell.net/faqmain.htm All new articles provide code in C# and VB.NET. Subscribe to the RSS feeds provided and never miss a new article. [quoted text, click to view] "schneider" <eschneider.news.ms@starkinvestments.com> wrote in message
news:Obv5zTUfIHA.4164@TK2MSFTNGP05.phx.gbl... > There is a lot of code and I can only reproduce it through a set of mouse > sequences. > I think maybe the graphics has been disposed, but can't be sure. Seems > strange the thow an error reading a property. Every property in graphics > says "Invalid parameter value". What parameter? > > it craps out on: > > Graphics.TextRenderingHint > > or > > Graphics.Save > > > > > "Bob Powell [MVP]" <bob@spamkillerbobpowell.net> wrote in message > news:87386324-AFC5-4C6F-84B1-C0104F40D202@microsoft.com... >> Can you post an example of when this occurs? >> >> -- >> -- >> Bob Powell [MVP] >> Visual C#, System.Drawing >> >> Ramuseco Limited .NET consulting >> http://www.ramuseco.com >> >> Find great Windows Forms articles in Windows Forms Tips and Tricks >> http://www.bobpowell.net/tipstricks.htm >> >> Answer those GDI+ questions with the GDI+ FAQ >> http://www.bobpowell.net/faqmain.htm >> >> All new articles provide code in C# and VB.NET. >> Subscribe to the RSS feeds provided and never miss a new article. >> >> >> "schneider" <eschneider@ooooooooo.com> wrote in message >> news:OJ1JATweIHA.3724@TK2MSFTNGP02.phx.gbl... >>> Under some cases Graphics.TextRenderingHint and also Graphics.Save >>> throws an exception? >>> >>> I can't seem to understand why. or what I'm doing wrong? and the error >>> message is useless. >>> >>> Anyone know whats going on? >>> >>> Thanks >>> Schneider >>> >> > >
It's been done too many times before. Chris Sell's and Mahesh Chands
books are great. Anyway, I'm waaaay to busy working ;-) -- Bob Powell [MVP] Visual C#, System.Drawing Ramuseco Limited .NET consulting http://www.ramuseco.com Find great Windows Forms articles in Windows Forms Tips and Tricks http://www.bobpowell.net/tipstricks.htm Answer those GDI+ questions with the GDI+ FAQ http://www.bobpowell.net/faqmain.htm All new articles provide code in C# and VB.NET. Subscribe to the RSS feeds provided and never miss a new article. [quoted text, click to view] schneider wrote:
> Was think of writing some kind of generic wrapper to see if i am disposing > it too early... > > Thanks, for the help, and I'm still waiting for you to publish a book on > .NET Drawing... > > Thanks again, > Schneider > > > "Bob Powell [MVP]" <bob@spamkillerbobpowell.net> wrote in message > news:6DF1B4BF-96D7-4FEB-995E-38C3E161107C@microsoft.com... >> Disposing the graphics is a common problem. You'll need to check your >> code carefully. >> >> -- >> -- >> Bob Powell [MVP] >> Visual C#, System.Drawing >> >> Ramuseco Limited .NET consulting >> http://www.ramuseco.com >> >> Find great Windows Forms articles in Windows Forms Tips and Tricks >> http://www.bobpowell.net/tipstricks.htm >> >> Answer those GDI+ questions with the GDI+ FAQ >> http://www.bobpowell.net/faqmain.htm >> >> All new articles provide code in C# and VB.NET. >> Subscribe to the RSS feeds provided and never miss a new article. >> >> >> "schneider" <eschneider.news.ms@starkinvestments.com> wrote in message >> news:Obv5zTUfIHA.4164@TK2MSFTNGP05.phx.gbl... >>> There is a lot of code and I can only reproduce it through a set of mouse >>> sequences. >>> I think maybe the graphics has been disposed, but can't be sure. Seems >>> strange the thow an error reading a property. Every property in graphics >>> says "Invalid parameter value". What parameter? >>> >>> it craps out on: >>> >>> Graphics.TextRenderingHint >>> >>> or >>> >>> Graphics.Save >>> >>> >>> >>> >>> "Bob Powell [MVP]" <bob@spamkillerbobpowell.net> wrote in message >>> news:87386324-AFC5-4C6F-84B1-C0104F40D202@microsoft.com... >>>> Can you post an example of when this occurs? >>>> >>>> -- >>>> -- >>>> Bob Powell [MVP] >>>> Visual C#, System.Drawing >>>> >>>> Ramuseco Limited .NET consulting >>>> http://www.ramuseco.com >>>> >>>> Find great Windows Forms articles in Windows Forms Tips and Tricks >>>> http://www.bobpowell.net/tipstricks.htm >>>> >>>> Answer those GDI+ questions with the GDI+ FAQ >>>> http://www.bobpowell.net/faqmain.htm >>>> >>>> All new articles provide code in C# and VB.NET. >>>> Subscribe to the RSS feeds provided and never miss a new article. >>>> >>>> >>>> "schneider" <eschneider@ooooooooo.com> wrote in message >>>> news:OJ1JATweIHA.3724@TK2MSFTNGP02.phx.gbl... >>>>> Under some cases Graphics.TextRenderingHint and also Graphics.Save >>>>> throws an exception? >>>>> >>>>> I can't seem to understand why. or what I'm doing wrong? and the error >>>>> message is useless. >>>>> >>>>> Anyone know whats going on? >>>>> >>>>> Thanks >>>>> Schneider >>>>> >>> >
I still can't figure this out. Some how I invalidate the Graphics object.
Graphics.Save Graphics.TextRenderHint Graphics.MeasureString all throw ArgumentException "Parameter is not valid.", and I'm not disposing it. Anyone have any ideas? Thanks, Schneider [quoted text, click to view] "schneider" <eschneider@ooooooooo.com> wrote in message news:OJ1JATweIHA.3724@TK2MSFTNGP02.phx.gbl... > Under some cases Graphics.TextRenderingHint and also Graphics.Save throws > an exception? > > I can't seem to understand why. or what I'm doing wrong? and the error > message is useless. > > Anyone know whats going on? > > Thanks > Schneider >
I can't post all the code, there is just too much. My initial assumtion was that a state on Graphics was change by me, which caused this problem, and was hoping some one had experience with that problem and how to fix it. I have seen this before when drawing text. I think I have narrowed it down to the control resize event and the control on_paint event. I think your correct that the owner is disposing it before I am done drawing. If a new paint event is triggered, does it dispose the previous graphics object right away? If so that is probably my problem... Thanks, Schneider [quoted text, click to view] "Bob Powell [MVP]" <bob@spamkillerbobpowell.net> wrote in message
news:u0$Oo%236fIHA.2000@TK2MSFTNGP03.phx.gbl... >I bet you're caching one you've been given. > > The owner will call dispose on it an you'll be left with a disposed > reference. > > Don't cache Graphics objects. > > Mind you, if you just posted all the code instead of feeding us snippets > and frustration we'd be able to see and point out the mistakes instead of > having to get the ideas through a process of divination... > > -- > Bob Powell [MVP] > Visual C#, System.Drawing > > Ramuseco Limited .NET consulting > http://www.ramuseco.com > > Find great Windows Forms articles in Windows Forms Tips and Tricks > http://www.bobpowell.net/tipstricks.htm > > Answer those GDI+ questions with the GDI+ FAQ > http://www.bobpowell.net/faqmain.htm > > All new articles provide code in C# and VB.NET. > Subscribe to the RSS feeds provided and never miss a new article. > > > > > > schneider wrote: >> I still can't figure this out. Some how I invalidate the Graphics object. >> >> Graphics.Save >> Graphics.TextRenderHint >> Graphics.MeasureString >> >> all throw ArgumentException "Parameter is not valid.", and I'm not >> disposing it. >> >> Anyone have any ideas? >> >> Thanks, >> >> Schneider >> >> >> >> "schneider" <eschneider@ooooooooo.com> wrote in message >> news:OJ1JATweIHA.3724@TK2MSFTNGP02.phx.gbl... >>> Under some cases Graphics.TextRenderingHint and also Graphics.Save >>> throws an exception? >>> >>> I can't seem to understand why. or what I'm doing wrong? and the error >>> message is useless. >>> >>> Anyone know whats going on? >>> >>> Thanks >>> Schneider >>> >>
I bet you're caching one you've been given.
The owner will call dispose on it an you'll be left with a disposed reference. Don't cache Graphics objects. Mind you, if you just posted all the code instead of feeding us snippets and frustration we'd be able to see and point out the mistakes instead of having to get the ideas through a process of divination... -- Bob Powell [MVP] Visual C#, System.Drawing Ramuseco Limited .NET consulting http://www.ramuseco.com Find great Windows Forms articles in Windows Forms Tips and Tricks http://www.bobpowell.net/tipstricks.htm Answer those GDI+ questions with the GDI+ FAQ http://www.bobpowell.net/faqmain.htm All new articles provide code in C# and VB.NET. Subscribe to the RSS feeds provided and never miss a new article. [quoted text, click to view] schneider wrote:
> I still can't figure this out. Some how I invalidate the Graphics object. > > Graphics.Save > Graphics.TextRenderHint > Graphics.MeasureString > > all throw ArgumentException "Parameter is not valid.", and I'm not disposing > it. > > Anyone have any ideas? > > Thanks, > > Schneider > > > > "schneider" <eschneider@ooooooooo.com> wrote in message > news:OJ1JATweIHA.3724@TK2MSFTNGP02.phx.gbl... >> Under some cases Graphics.TextRenderingHint and also Graphics.Save throws >> an exception? >> >> I can't seem to understand why. or what I'm doing wrong? and the error >> message is useless. >> >> Anyone know whats going on? >> >> Thanks >> Schneider >> >
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