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How to know CPU frequency? Declaration Source position: sysutilh.inc line 107 type Exception = class(TObject) end; public constructor Create(); Constructs a new exception object with a given message. It can be used to manipulate the exception object in the exception handling code. That is, when a certain exception occurs, I want to trap it and deal with it.

These block serve to catch exceptions raised within the scope of the block, and to provide exception-recovery code. Rather it's part of Lazarus. If no such statement is found, the Free Pascal Run-Time Library will generate a run-time error 217 (see also section 17.5, page 846). Of course, there might be situations, where the risk of an exception is high or expected so the use of a try..except block is necessary there.

The access violation error is triggered on MouseUp. It is recommended to use the Exception object or a descendant class for all raise statements, since then you can use the message field of the exception object. As an example, the following operator allows to compare two complex numbers: operator = (z1, z2 : complex) b : boolean; the above definition allows comparisons of the following form: Var    C1,C2 : Complex;    begin    If C1=C2 then      Writeln('C1 and C2 are equal');  end; The comparison If an exception occurs during the execution of the statement list, the program flow will be transferred to the except block.

Here also, the compiler doesn't apply commutativity: if the two types are different, then it is necessary to define 2 comparison operators. I know that's funny. Hot Network Questions How to decrypt a broken S/MIME message sent by Outlook? If they are not specified, the compiler will provide the address by itself.

If no such statement is found, the Free PascalRun-Time Library will generate a run-time error 217 (see also section exceptclasses). ShowException Show the current exception to the user. Browse other questions tagged exception-handling lazarus or ask your own question. But if I start by clicking the last item, it shows the error "Access violation" AFTER it has shown the items.

The comparison operators that can be overloaded are: equal to (=) To determine if two variables are equal. The main thread TThread method Execute is called from the function ThreadProc located in unit Classes. These block serve to force code to be executed irrespective of an exception occurrence or not. DWARF If the dwarf debugging format is selected (compiler switch -gw), the unit lnfodwrf is automatically included in the program and BackTraceStrFunc function is remapped to DwarfBacktraceStr.

Finally  blocks. Privacy policy About Free Pascal wiki Disclaimers [next] [tail] [up] 17.1 The raise statement The raise statement is as follows: _________________________________________________________________________________________________________Raise statement ___________________________________________________________________ This statement will raise an exception. Nonetheless, it is what I wanted to do. Coming from a VB6 background (for visual coding), we used these type of tricks but c'mon, we're taling Pascal here :) Thanks anyway and I think you technique should be good

Thanks in advance for any help! Fatal errors : 150 Disk is write protected. 151 Unknown device. 152 Drive not ready. 153 Unknown command. 154 CRC check failed. 155 Invalid drive specified.. 156 Seek error on disk. Documentation generated on: Nov 14 2015 current community chat Stack Overflow Meta Stack Overflow your communities Sign up or log in to customize your list. But I am not fully in favour of putting an artificial delay.

These block serve to force code to be executed irrespective of an exception occurrence or not. In every thread in the application, a separate try-except block should be inserted to catch all unhandled exceptions by a custom exception handler. Try ... Exception support is based on 3 constructs: Raise statements.

The first matching type is used. Program flow will be done according to a lifo (last in, first out) principle: The code of the last encountered Try...Except or Try...Finally block will be executed first. Join them; it only takes a minute: Sign up Lazarus (FreePascal): How do I capture a system error and throw an exception? The following errors can occur: dos errors : 2 File not found. 3 Path not found. 4 Too many open files. 5 Access denied. 6 Invalid file handle. 12 Invalid file-access

But I can't help you more without seeing the code... –TLama Aug 12 '13 at 7:12 add a comment| up vote 1 down vote First, a big thank you to TLama ERROR1Lazarus/Ubuntu - start up error1Issue implementing an OSX CoreMidi MidiCallback function in Lazarus/FreePascal0How do I clear any output files for Lazarus (or perhaps Delphi)?0How to find Lazarus dependencies to run my I'm not in anyway suggesting that this is the best thing to do, but this is what I want to do for now. Once again, as TLama has indicated, this is not good advice.

To allow error recovery, the Try ... Pronuncia strana della "s" dopo una "r": un fenomeno romano o di tutta l'Italia? exception-handling lazarus share|improve this question asked Aug 9 '13 at 12:06 itsols 2,31232461 add a comment| 2 Answers 2 active oldest votes up vote 3 down vote accepted Generally, to catch Largest number of eɪ sounds in a word Why is water evaporated from the ocean not salty?

The following code shows how to omit an error reporting routine from the stack shown in the exception handler: {$mode objfpc}  uses sysutils;    procedure error(Const msg : string);    begin    raise exception.create(Msg) at      get_caller_addr(get_frame),      get_caller_frame(get_frame);  end;    procedure test2; But here's my problem... Exceptions As of version 0.99.7, Free Pascalsupports exceptions.