Send button click message in toolbar

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C

Win32

API

Hello,

I want to send button click message in Toolbar using Win32 API.
So, I made code like below.

//////////////////////////////////////////////////////////////////////////////

TBBUTTON TB_Data={0};
int btn_count= 0, i = 0;
...

// Searching Toolbar handle code using Spy++ and FindWindow function
// Parent_hWnd has handle value of Toolbar
...

btn_count = SendMessage(Parent_hWnd, TB_BUTTONCOUNT, 0, 0);
i = SendMessage(Parent_hWnd, TB_GETBUTTON, (WPARAM)5, (LPARAM)(&TB_Data));

SendMessage(Parent_hWnd, TB_PRESSBUTTON, (WPARAM)TB_Data.idCommand, (LPARAM)TRUE);
SendMessage(Parent_hWnd, TB_PRESSBUTTON, (WPARAM)TB_Data.idCommand, (LPARAM)FALSE);

//////////////////////////////////////////////////////////////////////////////

But it doesn't work.
As I know, below code means that information of fifth button save in TB_Data.
And then, If this code success, SendMessage return 1.

i = SendMessage(..,TB_GETBUTTON, 5, &TB_Data);

i value is 1.
But It doesn't seem right data save in TB_Data.
Of course SendMessage(..,TB_PRESSBUTTON, ..) doesn't work.

Please advise me about this code.

What I have tried:

I want to send button click message in Toolbar using Win32 API.