What is Loword and Hiword?

LOWORD and HIWORD are macros. LOWORD gets the lower 16 bits of a 32 bit integer and HIWORD gets the upper 16 bits. the wParam and lParam give you information about a particular message.

What is Hiword?

The HIWORD function extracts and returns the high-order word (upper two bytes) from the 32-bit integer value specified by lValue. HIWORD returns the high-order word (upper two bytes) of lValue.

What is Wm_command?

Sent when the user selects a command item from a menu, when a control sends a notification message to its parent window, or when an accelerator keystroke is translated. #define WM_COMMAND 0x0111.

What is Lparam and Wparam?

According to this, LPARAM is defined as LONG_PTR , which in 64-bit Windows is a signed, 64-bit value. WPARAM is defined as UINT_PTR , which in 64-bit Windows is an unsigned, 64-bit value. If you are defining your own message, you might want to assign its parameters accordingly.

What is Wm_create?

WM_CREATE message is received by window procedure when window is created and not shown yet. You can prepare initial state. For example, you can create controls (child windows), set default values for controls, etc. If something is wrong, you can cancel creation of window and it will not be shown.

How do you use Wparam and Lparam?

It is helpful to understand the origin of the terms. If you look at the design of window messages, you will see that if the message takes a pointer, the pointer is usually passed in the LPARAM , whereas if the message takes a handle or an integer, then it is passed in the WPARAM .

What is Wparam in win32?

WPARAM is defined as UINT_PTR , which in 64-bit Windows is an unsigned, 64-bit value. If you are defining your own message, you might want to assign its parameters accordingly.

What is the purpose of WM destroy message?

It is sent to the window procedure of the window being destroyed after the window is removed from the screen. This message is sent first to the window being destroyed and then to the child windows (if any) as they are destroyed.

What is the role of the parameters Wparam and Lparam?

wParam – Specifies additional message information. The contents of this parameter depend on the value of the uMsg parameter. lParam – Specifies additional message information. The contents of this parameter depend on the value of the uMsg parameter.

What are Wparam and Lparam used for in the Windows API?

You used the W parameter to pass things like handles and integers. If you look at the design of window messages, you will see that if the message takes a pointer, the pointer is usually passed in the LPARAM , whereas if the message takes a handle or an integer, then it is passed in the WPARAM .

What is window procedure?

A window procedure is a function that has four parameters and returns a signed value. The parameters consist of a window handle, a UINT message identifier, and two message parameters declared with the WPARAM and LPARAM data types. For more information, see WindowProc.

What would happen if we do not place Wm_quit message in the message queue when the user tries to close the window?

In the case of WM_CLOSE, DefWindowProc automatically calls DestroyWindow. That means if you ignore the WM_CLOSE message in your switch statement, the window is destroyed by default. We saw in the Window Messages section that PostQuitMessage puts a WM_QUIT message on the message queue, causing the message loop to end.

What is the difference between loword and hiword?

I understand that LOWORD is the value of the lower 2 bytes of an integer. I also know that HIWORD is the higher 2 byes of that integer. However, I came into contact with a code snippet which looked something like this:

What is the difference between lobyte and loword/hiword macros?

The LOBYTE macros returns a byte from a WORD. So, if you have a DWORD (like WPARAM/LPARAM), you should use the LOWORD/HIWORD macros to retrieve a pair of 16-bit words from a single 32-bit DWORD. If you have a 16-bit WORD and need the two 8-bit BYTEs that make up that word, then you’ll use LOBYTE/HIBYTE to retrieve them.

What is loword and thank you @?

THank YOu @! They are macros. LOWORD gets the lower two bytes of a 4 byte value and so on. Say no to supplying ready made code for homework/work assignments!! Please rate this post! I got that in msdn and I still couldn understand it? Do you have any sample? THank YOu @! what are the two lower bytes of that intger?

Is hiword the higher 2 byes of an integer?

I also know that HIWORD is the higher 2 byes of that integer. However, I came into contact with a code snippet which looked something like this: From what it appears, it looks as though the programmer is suggesting to place the value of one function into another function. However, that seems impossible without some serious programmer magic.