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    <p>I most strongly recommend not to use GetFileVersion when you want to know the version of the executable that is currently running! I have two pretty good reasons to do this:</p> <ol> <li>The executable may be unaccessible (disconnected drive/share), or changed (.exe renamed to .bak and replaced by a new .exe without the running process being stopped).</li> <li>The version data you're trying to read has actually already been loaded into memory, and is available to you by loading this resource, which is always better than to perform extra (relatively slow) disk operations.</li> </ol> <p>To load the version resource in Delphi I use code like this:</p> <pre><code>uses Windows,Classes,SysUtils; var verblock:PVSFIXEDFILEINFO; versionMS,versionLS:cardinal; verlen:cardinal; rs:TResourceStream; m:TMemoryStream; p:pointer; s:cardinal; begin m:=TMemoryStream.Create; try rs:=TResourceStream.CreateFromID(HInstance,1,RT_VERSION); try m.CopyFrom(rs,rs.Size); finally rs.Free; end; m.Position:=0; if VerQueryValue(m.Memory,'\',pointer(verblock),verlen) then begin VersionMS:=verblock.dwFileVersionMS; VersionLS:=verblock.dwFileVersionLS; AppVersionString:=Application.Title+' '+ IntToStr(versionMS shr 16)+'.'+ IntToStr(versionMS and $FFFF)+'.'+ IntToStr(VersionLS shr 16)+'.'+ IntToStr(VersionLS and $FFFF); end; if VerQueryValue(m.Memory,PChar('\\StringFileInfo\\'+ IntToHex(GetThreadLocale,4)+IntToHex(GetACP,4)+'\\FileDescription'),p,s) or VerQueryValue(m.Memory,'\\StringFileInfo\\040904E4\\FileDescription',p,s) then //en-us AppVersionString:=PChar(p)+' '+AppVersionString; finally m.Free; end; end; </code></pre>
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    1. POHow to determine Delphi Application Version
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    1. COI'll vote this up if you make the code exception-safe with regard to memory and resource allocations.
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    2. COI've added try-finally's, should do the trick. In case you were wondering what the TMemoryStream's for: VerQueryValue had trouble reading from rs.Memory directory...
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    3. COIf resources are anything like they were in my API days, they aren't already in memory, but are fetched from the file. Also, it would be unusual to be doing a swap underneath the app, so I don't think it worth worrying about for most people.
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