Watch Breakpoint Online Free

[Carmelina Olden]

SoI have been reversing a piece of malware recently and figured I could use a conditional breakpoint that would break whenever the zero flag was set for a specific jz command. I read the documentation on the web and in the help file that olly provides but can't find any examples of how I would do that. In the online documentation it says that the EFL or Flags registers can be used in a watch/conditional breakpoint expression but no mention on how to refer to them. I tried a simple expression such as ZF == 1 as well as ZF = 1 (just in case i had it wrong) and it didnt work. I searched google like mad and nothing so I am hoping someone out there has found some way to reference the flags register. For those of you who wonder why I don't just use an expression without the flags register well, I am more curious as to how to reference the flags register in the event I really need it.

Breakpoints are one of the most important debugging techniques in your developer's toolbox. You set breakpoints wherever you want to pause debugger execution. For example, you may want to see the state of code variables or look at the call stack at a certain breakpoint. If you are trying to resolve a warning or issue while using breakpoints, see Troubleshoot breakpoints in the Visual Studio debugger.

You can set a breakpoint on any line of executable code. For example, in the following C# code, you could set a breakpoint on the line of code with the variable assignment (int testInt = 1), the for loop, or any code inside the for loop. You can't set a breakpoint on method signatures, declarations for a namespace or class, or variable declarations if there's no assignment and no getter/setter.

At the breakpoint in the following example, the value of testInt is still 3. So, the value hasn't changed since the variable was initialized (set to a value of 3) because the statement in yellow hasn't yet executed.

At the breakpoint in the following example, the value of testInt is still 1. So, the value hasn't changed since the variable was initialized (set to a value of 1) because the statement in yellow hasn't yet executed.

To disable a breakpoint without deleting it, hover over or right-click it, and select Disable breakpoint. Disabled breakpoints appear as empty dots in the left margin or the Breakpoints window. To re-enable a breakpoint, hover over or right-click it, and select Enable breakpoint.

Set conditions and actions, add and edit labels, or export a breakpoint by right-clicking it and selecting the appropriate command, or hovering over it and selecting the Settings icon.

A tracepoint is a breakpoint that prints a message to the Output window. A tracepoint can act like a temporary trace statement in the programming language and does not pause the execution of code. You create a tracepoint by setting a special action in the Breakpoint Settings window. For detailed instructions, see Use tracepoints in the Visual Studio debugger.

You can control when and where a breakpoint executes by setting conditions. The condition can be any valid expression that the debugger recognizes. For more information about valid expressions, see Expressions in the debugger.

If you set a breakpoint condition with invalid syntax, a warning message appears. If you specify a breakpoint condition with valid syntax but invalid semantics, a warning message appears the first time the breakpoint is hit. In either case, the debugger breaks when it hits the invalid breakpoint. The breakpoint is skipped only if the condition is valid and evaluates to false.

There are times when you want to observe the behavior of a specific object. For example, you might want to find out why an object was inserted into a collection more than once. In C# and F#, you can create object IDs for specific instances of reference types, and use them in breakpoint conditions. The object ID is generated by the common language runtime (CLR) debugging services and associated with the object.

If you suspect that a loop in your code starts misbehaving after a certain number of iterations, you can set a breakpoint to stop execution after that number of hits, rather than having to repeatedly press F5 to reach that iteration.

Under Conditions in the Breakpoint Settings window, select Hit Count, and then specify the number of iterations. In the following example, the breakpoint is set to hit on every other iteration:

You can break execution when a function is called. This is useful, for example, when you know the function name but not its location. It is also useful if you have functions with the same name and you want to break on them all (such as overloaded functions or functions in different projects).

You can use the address of an object to set a function breakpoint on a method called by a specific instance of a class. For example, given an addressable object of type my_class, you can set a function breakpoint on the my_method method that instance calls.

In the Byte Count dropdown, select the number of bytes you want the debugger to watch. For example, if you select 4, the debugger will watch the four bytes starting at &avar and break if any of those bytes change value.

Data breakpoints depend on specific memory addresses. The address of a variable changes from one debugging session to the next, so data breakpoints are automatically disabled at the end of each debugging session.

If you set a data breakpoint on a local variable, the breakpoint remains enabled when the function ends, but the memory address is no longer applicable, so the behavior of the breakpoint is unpredictable. If you set a data breakpoint on a local variable, you should delete or disable the breakpoint before the function ends.

Dependent breakpoints break execution only if another breakpoint is first hit. So, in a complex scenario such as debugging a multi-threaded application, you can configure the additional breakpoints after another breakpoint is first hit. This can make debugging code in common paths such as game loop or a utility API much easier because a breakpoint in those functions can be configured to enable only if the function is invoked from a specific part of your application.

This breakpoint lets you break the code only once. When debugging, the Visual Studio debugger only pauses the running application once for this breakpoint and then removes it immediately after it has been hit.

You can use the Breakpoints window to see and manage all the breakpoints in your solution. This centralized location is especially helpful in a large solution, or for complex debugging scenarios where breakpoints are critical.

When you write VBA, or any programming language, you are going to encounter errors in it, or should we call them unintended features? Basically you can't write any substantial amount of code without needing to fix errors and make sure that it works as it's supposed to.

If your code calls another sub, you may not want to step through each line of code in that 2nd sub. In this case you can 'step over' the 2nd sub and immediately continue executing the code in your 1st sub.

My sub ListNumbers calls another sub ChangeFont. When code execution gets to the call for ChangeFont, I can press SHIFT + F8, the ChangeFont sub is executed, but I don't have to wait for this, and the code pauses again at the next line which is the End Sub statement.

To create a breakpoint you can either position the cursor on the desired line and press F9, or just click in the margin beside that line. A dark red/brown dot will appear beside the line in question to indicate a breakpoint has been set, and that line of code is highlighted in the same color.

So if I have started my For loop where the variable counter takes the values from 0 to 10, and then decide I want counter to actually go up to 20, I just drag the yellow arrow back up to the start of the For loop, change 0 to 20, then start stepping through the loop again.

You now have 3 choices. Don't worry about the Context as you shouldn't need to change this. What you need to decide is do you want to simply watch the variable. In which case you'll see its value change as the code executes. Or do you want to break (like breakpoints) when the variables value is True (for Boolean variables) or break when the value changes.

As I've demonstrated, you can alter your code on the fly while you are debugging. This is a great way to iron out issues. Just change the offending code, then use your mouse to drag the yellow arrow to change the next line to be executed.

Hi Sudip,

sec = ActiveCell represents only a single cell, it does not move to another cell even if this code is placed within the loop. If you want this value to change at each loop iteration, use sec=sh1.cells(i,3).Value

can you please upload a sample file on our forum?

Will be easier to help you.

Hi, I'm Mynda Treacy and I run MOTH with my husband, Phil. Through our blog, webinars, YouTube channel and courses we hope we can help you learn Excel, Power Pivot and DAX, Power Query, Power BI, and Excel Dashboards.

Set break on calculation sets a calculation breakpoint for each variable in the list. You can set the calculation for each variable using Set break calculation. Setting calculation breaks for more than a very few variables will cause methods to run very slowly.

Open value window opens a value window for each variable on the list, or for every variable on the watch variables list if no variables are specified. There is a limit on the number of windows that you can open at once.

Open values list opens the values list for each of the variable types given in the command parameters. For example, Variable menu command: open values list lValue, iCount opens two values lists, one for Local variables, the other for Instancel variables. There is one values list for each file class, so if more than one variable name in a particular file class is specified the values list for that file will only be opened once. There is also a limit on the number of windows that you can open at once.

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