VB only knows how the parent window title gets the child window handle

Based on the supplementary information, the modifications are as follows:

Add the control command1 to the form, then copy the following**, run, start the drawing program, click command1, and you can find the handle of the drawing paper you want!

option explicit

private declare function findwindow lib "user32" alias "findwindowa" (byval lpclassname as string, byval lpwindowname as string) as long

private declare function findwindowex lib "user32" alias "findwindowexa" (byval hwnd1 as long, byval hwnd2 as long, byval lpsz1 as string, byval lpsz2 as string) as long

private sub command1_click()

dim huatu, huazi

dim i as integer

huatu = findwindowex(0, 0, vbnullstring, "Untitled—Paint")

do until huatu = 0

huazi = findwindowex(huatu, 0, "afxframeorview42u", vbnullstring)

huazi = findwindowex(huazi, 0, "afx:1000000:8", vbnullstring)

i = i + 1

msgbox "Find the section" & i & "A drawing paper, and its handle is:" & huazi

huatu = findwindowex(0, huatu, vbnullstring, "Untitled—Paint")

loopend sub

declare function findwindowex lib "user32" alias "findwindowexa" (byval hwnd1 as long, byval hwnd2 as long, byval lpsz1 as string, byval lpsz2 as string) as long

hwnd1 is the window sentence cake you find in Notepad.

dim hwnd2 as long

hwnd1 = findwindow(vbnullstring, "Hello")

hwnd2= findwindowex(hwnd1,0,vbnullstring,"Send")

private sub command1_click()dim h&

doh = findwindowex(, h, vbnullstring, vbnullstring)

if h <>0 then

hend if

loop until h = 0

end sub

For example, this is to enumerate all the child forms (controls) of the current form, and if you need to get the child form handles of other forms, you can change them to the parent form handles.

public declare function getwindow lib "user32" alias "getwindow" (byval hwnd as long, byval wcmd as long) as long

Gets a handle to a window that has a specific relationship to a source window.

Return value: long, the handle of a window determined by wcmd. If no matching window is found, or if an error is encountered, a zero value is returned. getlasterror is set

hwnd --long, the source window.

wcmd --long, specifies the relationship between the result window and the source window, which is based on the following constants:

gw_child

Look for the first child window of the source window.

gw_hwndfirst

Look for the first sibling (sibling) window for a source child window, or look for the first top-level window.

gw_hwndlast

Find the last sibling (sibling) window for a source child window, or the last top-level window.

gw_hwndnext

Find the next sibling window for the source window.

gw_hwndprev

Look for the previous sibling window for the source window.

gw_owner

Look for the owner of the window.

A sibling or sibling is a window that is at the same level throughout the hierarchy. If a window has five child windows, those five windows are sibling windows. Although GetWindow can be used to enumerate windows, EnumWindows and EnumChildWindows are more reliable if you want to relocate, create, and clear windows during the enumeration process.

Select gw owner (looking for the owner of the window) as a parameter.

getparent

in . Gets the handler of a window directly under the parent window

The immediate parent of a window can be chaotic, which means you can use setparent to set the parent of a window (but this may be dangerous and may be genetic).

declare function findwindowex lib "user32" alias "findwindowexa" (byval hwnd1 as long, byval hwnd2 as long, byval lpsz1 as string, byval lpsz2 as string) as long

hwnd1 is the window sentence cake you find in Notepad.

dim hwnd2 as long

hwnd1 = findwindow(vbnullstring, "Hello")

hwnd2= findwindowex(hwnd1,0,vbnullstring,"Send")