A difference between application->createform and New in the BCB

A difference between application->create and NEW

When I wrote the Windows service recently, I happened to encounter a problem. I built a datamodal and then created an object A in the Datamodal OnCreate event with another class A.

A will go to access the global pointer for Datamodal. This is equivalent to the following thing:

It is found that the Datamodal global pointer to a access has the following 2 cases,

If created with Application->createform, a can access the global pointer to Datamodal. That is, create it in the following way:

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If you create a datamodal global pointer in new mode, it is null at OnCreate.

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Writing the example below to test it confirms my idea.

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1. New project, have a Form1, then put 2 buttons

2. Create a new Form2 class and set the startup properties so that Form2 is not actively created.

3. Write the following code to the button on the Form1

4. Add the following code to the OnCreate event in Form2

5. Run the program with the following results:

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As a result, forms created using the Application->createform method are, indeed, written differently through the new C + + creation.

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A distinction between createform and new, mamicode.com "style=" color: _blank and New in >BCB in #ffffff "target=" Application->createform " One of the differences