create graphic elements in program

[grumpyBUBBLEZ]

Hello, I'm trying to create a graphic element in program with dynamic memory allocation, I just finished a semester learning about C++, but we didn't cover this topic and I would like some advice on the best way to do this.

I'm using Borland C++ Builder 6

Any and all help would be greatly appreciated.

[anonymous23323124]

How about a graphics library such as SFML http://sfml-dev.org/

[grumpyBUBBLEZ]

Thank you for your response, I checked your link and it seems very interesting but I already have the actual graphic elements at my disposal,but I can't seem to create them in program.

This was just a test I did to see if I remembered how to do dynamic memory allocation, and it works.

void __fastcall TForm1::Button1Click(TObject *Sender)
{
//Create pointer
char * test;

//Allocate memory bloc
test = new char[50];

//Insert confirmation message
test = "creation successful";

//Display string
EditBox->Text = test;

//Delete
delete[] test;
}

But what I would like to do is create a editing box when I push a button in program. I tried to do it with the code below, but it didn't work. If anybody can show me my mistakes it would help me alot.

TEdit refers to a class for a simple editing box.

void __fastcall TForm1::Button1Click(TObject *Sender)
{
//Create pointer
TEdit * EditTest;

//Allocate memory bloc
EditTest = new TEdit;

//Display confirmation
EditTest->Text = "creation successful";
}

The new editing box is deleted later in the program at the users discretion.

[Disch]

Do you know what API this is? What header are you including to get TEdit/TObject?

[webJose]

This reminds me of Turbo Pascal's TurboVision: TButton, TView, etc. It was a GREAT library for creating Windows-like DOS applications. Had mouse support and everything.

Please use [code]//Code goes here [/code].

You are leaking memory by creating a new char array of 50 chars and then just losing the pointer. If you are not dynamically creating the string, don't allocate memory. Just go EditBox->Text ="creation successful";, provided it is the only error. I am also lost as to which library this is.

[grumpyBUBBLEZ]

I really can't tell you where these things come from (TEdit or TObject) we weren't given any detailed explanation of the RAD we were using ( Borland C++ Builder 6 ), just how to use it. To insert a graphic element all we were told to do is select the element we want and place it in the interface, all the inclusions are automatically done by the RAD itself.

I know that I have to delete whatever I create, I was just giving a example. The string I inserted was just to show me if the allocation was successful.

[Athar]

C++Builder's framework is called VCL.

I know that I have to delete whatever I create, I was just giving a example. The string I inserted was just to show me if the allocation was successful.

But you weren't inserting anything. You just replaced the address that was returned by new[] with the start address of the string literal, thus losing the previous address and creating a memory leak.
You then used delete[] on the string literal address, which isn't allowed and results in undefined behavior.