Background info on libpng warning: iCCP: known incorrect sRGB profile

I was just checking some log file saved from Buildbox and seems Qt framework was logging the error:

libpng warning: iCCP: known incorrect sRGB profile

Did some quick research on Google (sorry dear Bing) and added the following background info to the respective question on StackOverflow:

http://stackoverflow.com/questions/22745076/libpng-warning-iccp-known-incorrect-srgb-profile/

Some changes in libpng version 1.6+ cause it to issue a warning or even not work correctly with the original HP/MS sRGB profile, leading to the following stderr: libpng warning: iCCP: known incorrect sRGB profile The old profile uses a D50 whitepoint, where D65 is standard. This profile is not uncommon, being used by Adobe Photoshop, although it was not embedded into images by default.

(source: https://wiki.archlinux.org/index.php/Libpng_errors)

Error detection in some chunks has improved; in particular the iCCP chunk reader now does pretty complete validation of the basic format. Some bad profiles that were previously accepted are now rejected, in particular the very old broken Microsoft/HP sRGB profile. The PNG spec requirement that only grayscale profiles may appear in images with color type 0 or 4 and that even if the image only contains gray pixels, only RGB profiles may appear in images with color type 2, 3, or 6, is now enforced. The sRGB chunk is allowed to appear in images with any color type.

(source: https://forum.qt.io/topic/58638/solved-libpng-warning-iccp-known-incorrect-srgb-profile-drive-me-nuts/16)

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Fix: Delphi error MSBuildToolsPath is not specified for the ToolsVersion …

This is my answer at:

http://stackoverflow.com/questions/32936544/delphi-10-seattle-trial-fails-to-compile-anything-gives-an-msbuild-error

for the issue of Delphi showing on build the error

MSBuildToolsPath is not specified for the ToolsVersion “12.0” defined at “HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSBuild\ToolsVersions\12.0”, or the value specified evaluated to the empty string

note that in my case it was also showing underlined unit names in the code editor at uses clause with “Cannot resolve unit name xx”


It is a known issue, documented here: https://community.embarcadero.com/article/technical-articles/16202-msbuildtoolspath-is-not-specified-for-the-toolsversion

This error is caused by incorrect values in the registry. On a 32 OS, run regedit and navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSBuild. On a 64 bit OS, run regedit and navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\MSBuild. First, backup this registry key by selecting File | Export. Next, look at the numbers below the ToolsVersions key. Delete any number not found at the MSBuild level. … There is anecdotal evidence to suggest this registry key imbalance is caused by uninstalling some versions of Visual Studio, but it has not been confirmed at this time.

Since I’ve been installing/uninstalling various Visual Studio versions (including previews), guess it has indeed been caused by that

Error “A default tools version “2.0” was specified, but its definition could not be found.” may appear then if you deleted the 2.0 key following the 1st article’s advice. Solution for that one is to edit each value under MSBuild key in the registry locations mentioned for x32 and x64 and change DefaultToolsVersion to 14.0 or other highest MSBuild tools version that is installed

Στιγμιότυπο οθόνης (504)

image

Note that on x64 machine you need to fix these two issues for both x32 and x64 registry locations, since the IDE is 32-bit process and if you fix x64 location only it will fail internally, underlining all Standard units at uses clause in your source code at uses clause and showing “Cannot resolve unit name xx”

Στιγμιότυπο οθόνης (506)

image

Also it may be useful to install this: https://www.microsoft.com/en-us/download/confirmation.aspx?id=48159

This may also be useful to know (copying from https://msdn.microsoft.com/en-us/library/bb383985.aspx):

Order of Precedence

The order of precedence, from highest to lowest, used to determine the ToolsVersion is: The ToolsVersion attribute on the MSBuild task used to build the project, if any.

The /toolsversion (or /tv) switch that’s used in the msbuild.exe command, if any.

If the environment variable MSBUILDTREATALLTOOLSVERSIONSASCURRENT is set, then use the current ToolsVersion.

If the environment variable MSBUILDTREATHIGHERTOOLSVERSIONASCURRENT is set and the ToolsVersion defined in the project file is greater than the current ToolsVersion, use the current ToolsVersion.

If the environment variable MSBUILDLEGACYDEFAULTTOOLSVERSION is set, or if ToolsVersion is not set, then the following steps are used:

The ToolsVersion attribute of the Project element of the project file. If this attribute doesn’t exist, it is assumed to be the current version.

The default tools version in the MSBuild.exe.config file.

The default tools version in the registry. For more information, see Standard and Custom Toolset Configurations.

If the environment variable MSBUILDLEGACYDEFAULTTOOLSVERSION is not set, then the following steps are used:

If the environment variable MSBUILDDEFAULTTOOLSVERSION is set to a ToolsVersion that exists, use it.

If DefaultOverrideToolsVersion is set in MSBuild.exe.config, use it.

If DefaultOverrideToolsVersion is set in the registry, use it.

Otherwise, use the current ToolsVersion.

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HowTo: Hide HTML markup from non-signedin users at MonoX Social CMS

At MonoX Social CMS, which I use at both ClipFlair Social and Trafilm websites, I was in the need of hiding some HTML markup when the user is not signed-in.

The solution for this is to add runat="server" to the HMTL element one wants to hide and then set the Visible property that the object acquires due to the runat clause. The Visible property is set using some special syntax to access the MonoX API like below:

<ul runat="server"
      Visible="<% $Code: Page.User.Identity.IsAuthenticated %>"  >

</ul>

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Redirecting output of batch file from the inside

Calling a label in a batch file is useful to redirect (for logging) the output of the batch file to a file from inside that same batch file, without needing to author a separate batch file to do the redirect of standard output.

@echo off

call :process > update_cxml.log
goto :EOF

:process

(Revised previous version of this post)

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Suggestion: add optional “where” clause to “foreach” statement in C#

Wouldn’t it be nice if I could use in C# the following syntax?

for (SomeType repeaterVariable

      in SomeEnumerable

      where someBooleanExpressionOfRepeaterVariable)

  doSomethingUsingRepeaterVariable;

e.g. use this one:

image

instead of this one:

image

BTW, if you wonder what FixTime does, it prepends 0: to time strings to make sure they are of format h:m:s.f

Have added this as a comment to another person’s suggestion that I see has similar format, so please vote for that one:

https://visualstudio.uservoice.com/forums/121579-visual-studio-2015/suggestions/7474789-add-condition-to-foreach-in-statement

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Suggestion: Add instance modifiers to C# (and other languages)

I’d like to be able to do

someFunctionReturningY(x){ somePropertyOfY=4; … }.DoSomething();

It should also support casting without needing parentheses in the following type of statement:

Z zzz = (Z)functionReturningY{somePropertyOfZ=…; … };

 

The same pattern should work for enums too apart from object instances. It is inspired by initializers in C#, e.g. var x = new Test(){someProperty=…}. It’s just a generalization of the same pattern.

E.g. at the following scenario I want to modify an object that GetMetadataFromUI function returns

C#SuggestionObjectModifiers1

 

and currently I’m forced to write this which is way more verbose:

C#SuggestionObjectModifiers2 

 

If you like this suggestion please vote for it at:

https://visualstudio.uservoice.com/forums/121579-visual-studio-2015/suggestions/13804794-suggestion-add-instance-modifiers-to-c-and-othe

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