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There are six lines of code between Sub TestWatch() and Debug.Print "Charlie" (inclusive). Notice that VBA evaluates the expression before every single line of code and also every time that code execution halts. The initial value of MyVar is zero, which means the watched expression evaluates to False at the start. In the first test, we're just running the test function using Run > Run Macro (F5). Break When Value Is True Run Sub - No Breakpoints - Expression False at the Start.method of code execution (e.g., "Run" vs.
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Throughout this series of articles, the code itself and the expression being watched will remain the same.
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Note that each time this expression is evaluated, the value of MyVar will be printed to the immediate window, along with the current date and time. Here's the expression I will be watching. Sleep 1000 'Sleep for one second for demo purposes Public Declare Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Long)įunction Watch(Val, Optional CalledFrom As String = "") Public Declare PtrSafe Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Long) Here's the sample code I will be using for the demonstration: #If VBA7 Then To demonstrate the behavior of the different Watch Types, I'm going to use my own custom Watch() method to illustrate just how often these expressions are being evaluated. This has important implications when it comes to debugging performance. In order to do this, it must evaluate the expression before executing every line of code. This type of Watch monitors the expression and halts code execution when the expression evaluates to True. We'll focus on the second type in this article: Break When Value Is True. This is the second in a series of articles that will dive into the behavior of the different Watch Types in VBA:
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