I have a COM object written in Delphi that has a property that returns a variant. Basically this property returns a value depending on the parameter I pass it. When I access the object from VBA (Excel for example), I can write something like : MyObject.MyProperty("IntProperty") = 22 Now the property can also return an IDispatch object...
There are software applications, such as ArtMoney, that edit the memory of other applications. Is there a way to detect when some other application is editing the memory of my application? ...
In the Delphi Project Properties dialog, there are settings for the "Product Version" and the "File Version". Can anyone explain the philosophical differences between the two? ...
I need to dynamically change position of certain column in DBGRid. Let's say I need to place column number 21 on position 10. I use: DBGrid.Columns[21].Index:=10; But, this also changes the array itself, that means, that next time I want to access this column, I will need to write DBGrid.Columns[10], this makes it a little unclean, I ...
I have some homework for my school and I have to make a snake game, like Nokia's, in Delphi. I wonder which solution is the best. I want my snake be a class and the body is an array of points (parent class) or a linked list of points. What's the best? An array or a linked list? ...
In my previous question "How to find the unique serial number of a flash device?" I ended up asking for a way to get the drive letter. That problem is solved. However, my initial question has not been answered. I wanted to be able to tell removable devices (USB drives, SD cards, (external HDDs?), etc.) apart and always be able to recogn...
I've got a quaint little app that pops up an on screen numberpad/calculator written in Delphi. I'd like to make it so if you pressed 'enter' (on the number pad) you'd be pressing '=' and if you pressed 'return' (on the main keyboard) you'd be pressing 'OK'. There's an OK button who is the form's default guy which responds to hitting en...
I recently experienced some unusual behavior in using a 3rd party Navigator component in Delphi 2007 whereby upon setting the 'Flat' property to True, the buttons didn't remain Flat as they should with Themes Enabled but did so once I unchecked Enable Themes from within my project file and recompiled my program. This obviously didn't see...
Quick one; am I right in thinking that passing a string to a method 'as a CONST' involves more overhead than passing a string as a 'VAR'? The compiler will get Delphi to make a copy of the string and then pass the copy, if the string parameter is declared as a CONST, right? The reason for the question is a bit tedious; we have a legacy ...
hello all I am trying to use dbexpress component first time to connect to mysql i got this error Failure to Connect : Unable to load libmysql.dll my delphi version : Delphi7 mysql 5.1.36 (wamp server installed on my windows). can any one help me in this thanks in advance ...
I have a plan to install my application which is compiled using RAD2010 in Vista 32 bit dev. environment, in a win 2008 server 64 bit. I use Firebird 2.0 (32 bit) as database server. Is there any issue? Or it should run without any problem? ...
Hi all, can someone give me some advice on where to start. I have quite a complex system built as a delphi Activeform. And it runs embedded in a webpage. System runs great, except when closing down ie. after IE closes I get a bunch of error saying: IEXPLORE.EXE - Application Error The instruction at "blahblah' referenced memory at "an...
I'm currently using this code for md5 hashing in Delphi 7: function MD5(const fileName : string) : string; var idmd5 : TIdHashMessageDigest5; fs : TFileStream; begin idmd5 := TIdHashMessageDigest5.Create; fs := TFileStream.Create(fileName, fmOpenRead OR fmShareDenyWrite) ; try result := idmd5.AsHex(idmd5.HashValue(fs)) ; ...
A comment at the top of system.pas states: { Predefined constants, types, procedures, } { and functions (such as True, Integer, or } { Writeln) do not have actual declarations.} { Instead they are built into the compiler } { and are treated as if they were declared } { at the beginning of the System unit. } Obviously, that's nowhe...
I created a Delphi application which utilizes an ODBC data source to access text files in csv format. The driver is the "Microsoft Access Text Driver". But when I deploy my application on a Windows 7 computer it does not work because this driver is not available (there are only two available in odbcad32: sql native client and sql serve...
I just spend the good part of the afternoon trying to find out why some projects, when compiled and run from within the Delphi-2010 IDE produced a 'Security Risk - A program is behaving suspiciously on your computer' warning every time I compiled it. In the end it turned out to be the following: - if version information is turned on 'In...
Hi, I'm developing a Word addin in Delphi, on a task pane I put a Virtual treeview, in the OnFocus event of the Virtual Treeview I call Word to insert a file into the current Word document via method ActiveDocument.Range.InsertFile, but this operation will put the input focus back to the Word document window, so finally in this event h...
hi all I have an old program written in borland pascal and in Delphi if I use the Form1.Canvas.LineTo and MoveTo functions I get a flickering effect. Can anyone tell me how to get rid of the flickering? thanks ...
I'm trying to use the JclCompression unit, but when I do, the compiler always says: Unit JclCompression was compiled with a different version of sevenzip.IOutArchive What am I doing wrong here? I tried recompiling/installing my JEDI installation, but it didn't seem to help. ...
I have the following code that always fails with an "Abstract Error": arch := TJclCompressArchive.Create(GetDesktop + 'Support.7z'); try with arch do begin if FindFirst('*.log', faAnyFile, sr) = 0 then begin repeat AddFile(ExtractFileName(sr.Name),sr.Name); until FindNext(sr) <> 0; ...