Ludwin Feiten Window Message und PowerBuilder Ludwin Feiten Power People

Ludwin Feiten

Window Message und PowerBuilder

Ludwin FeitenPower People

C:\Programme\Sybase\PowerBuilder 9.0\pb90.exe

PBUGGDüsseldorf 26.05.2006

Window Messages und PowerBuilder

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Fahrplan

• Motivation• Send Function• Beispiel• Suchen in der Win-API

Help• Beispiel für PB Custom

Events • …




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Motivation

• PowerBuilder hat die Send()-Funktion

• Die Informationen darüber sind verstreut und mühsam zu finden.




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Window Events

• PowerBuilder ist eine Windows Anwendung

• Windows hat ein Event gesteuertes User Interface, das von PowerBuilder genutzt werden kann.

• Triggern von Events durch senden von Messages an Controls.

• SendMessage(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam );




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SendMessage Function

In Windows sind nicht nur Windows “windows” sondern auch fast alle anderen visuellen Control wie Buttons, Scrollbars, Editfields, etc.

Zur Identifizierung gibt es einen handle




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Send Function in PowerBuilder

• Send ( handle, message#, lowword, long )– handle: A long whose value is the system handle

of a window (that you have created in PowerBuilder or another application) to which you want to send a message.

– message#: An UnsignedInteger whose value is the system message number of the message you want to send.

– Lowword: A long whose value is the integer value of the message. If this argument is not used by the message, enter 0.

– Long: The long value of the message or a string.




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Send Function: Beispiele

• Dieses Statement scrollt das Fenster w_emp eine Seite hoch:

– Send(Handle(w_emp), 277, 2, 0)

• Das folgende Statements click den CommandButton cb_OK:

– Send(Handle(Parent), 273, 0, Handle(cb_OK))




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Messages: Wie kann man sie finden?

• windows API help– http://msdn.microsoft. com/library/

• winuser.h– C:\Program Files\Sybase\Shared\

PowerBuilder\cgen\h\nt\winuser.h




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Bspl.: Tab out a field

Suchen in der Windows API Hilfe mit– „Key pressed notification“

Führt zu:– „WM_KEYDONW




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Syntax WM_KEYDOWN• WM_KEYDOWN• WPARAM wParam

LPARAM lParam

• wParam: Specifies the virtual-key code of the nonsystem key.

• lParam: Specifies the repeat count, scan code, extended-key flag, context code, previous key-state flag, and transition-state flag, as shown in the following table.

• 0-15: Specifies the repeat count for the current message. The value is the number of times the keystroke is autorepeated as a result of the user holding down the key. If the keystroke is held long enough, multiple messages are sent. However, the repeat count is not cumulative.

• 16-23: Specifies the scan code. The value depends on the OEM

• 24: Specifies whether the key is an extended key, such as the right-hand ALT and CTRL keys that appear on an enhanced 101- or 102-key keyboard. The value is 1 if it is an extended key; otherwise, it is 0,

• 25-28: Reserved; do not use

• 29: Specifies the context code. The value is always 0 for a WM_KEYDOWN message

• 30: Specifies the previous key state. The value is 1 if the key is down before the message is sent, or it is zero if the key is up

• 31: Specifies the transition state. The value is always zero for a WM_KEYDOWN message

• Return Value: An application should return zero if it processes this message.

• 24: Specifies whether the key is an extended key, such as the right-hand ALT and CTRL keys that appear on an enhanced 101- or 102-key keyboard. The value is 1 if it is an extended key; otherwise, it is 0,

• 25-28: Reserved; do not use• 29: Specifies the context code. The value is always

0 for a WM_KEYDOWN message• 30: Specifies the previous key state. The value is 1

if the key is down before the message is sent, or it is zero if the key is up

• 31: Specifies the transition state. The value is always zero for a WM_KEYDOWN message

• Return Value: An application should return zero if it processes this message.




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Nächster Schritt

• winuser.h – #define WM_KEYDOWN 0x0100

• hex 0x0100 ist dec 256. (Windows Rechner in Wissenschaftlicher Ansicht)

• wParam muss der ASCII-Code for the Tab-Key sein: Das ist 9.

• lParam ist Null.

• Der Aufruf ist: send(Handle(this), 256,9, long(0,0))




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Besp. Scroll a window

Win32 and COM Development > User Interface > Windows Shell > Windows Controls >

Individual Control Information > Scroll Bars




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Syntax WM_VSCROLL • WM_VSCROLL

– WPARAM wParam– LPARAM lParam;

• wParam: – The high-order word specifies the

current position of the scroll box if the low-order word is SB_THUMBPOSITION or SB_THUMBTRACK; otherwise, this word is not used.

– The low-order word specifies a scroll bar value that indicates the user's scrolling request. This parameter can be one of the following values.

• SB_BOTTOM: Scrolls to the lower right. • SB_ENDSCROLL: Ends scroll. • SB_LINEDOWN: Scrolls one line down. • SB_LINEUP: Scrolls one line up. • SB_PAGEDOWN: Scrolls one page down. • SB_PAGEUP: Scrolls one page up.

• SB_THUMBPOSITION: The user has dragged the scroll box (thumb) and released the mouse button. The high-order word indicates the position of the scroll box at the end of the drag operation.

• SB_THUMBTRACK: The user is dragging the scroll box. This message is sent repeatedly until the user releases the mouse button. The high-order word indicates the position that the scroll box has been dragged to.

• SB_TOP: Scrolls to the upper left.

• lParam: – If the message is sent by a scroll

bar, this parameter is the handle to the scroll bar control. If the message is not sent by a scroll bar, this parameter is NULL.




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Nächster Schritt:

• winuser.h – #define WM_VSCROLL 0x0115

• hex 0x0115 ist dec 277.

• SB_PAGEDOWN ist 3

• lParam ist Null.

• Der Aufruf ist: send(Handle(this), 277,3, long(0,0))




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Strategien zur Suche

Suche in: MSDN Home > MSDN Library > Win32 and COM Development > User Interface > Windows Shell > Windows Controls

Subtopics:• “General Control Information”• “Individual Control Information”Suche unter:• "Messages" and "Notifications"




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Strategien zur Suche

Suche in winusers.hnach brauchbaren

Schlagwörtern.

Mappen von PB-Events auf WN-EventsSuche in spezieller Liste:

-> www.powerpeople.de

Microsoft Word-Dokument




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PowerBuilder custom events

• pbm_custom01 event ID maps to wm_user+0• pbm_custom02 event ID maps to wm_user+1, • …• pbm_custom75 event ID to wm_user+74.

• WM_USER is defined in winusers.h:

• #define WM_USER 0x0400 = 1024




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Application Ping-Pong




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Ping - Pong

• Suche der Instanzen des Programms (Find Instances)

• Schicken eines Pings (Send Ping)• Empfangen des Ping (ue_ping)->

Pong• Empfangen des Pong (ue_pong)




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Find Instances• // Original autor: Karl E. Peterson• // Aus VB "geklaut"

• ulong hWndTmp,&•

FindWindowPartial• string lpClassName,&• lpWindowName,&• TitleTmp,&• TitleStart• integer nRet• integer method

• constant integer FWP_STARTSWITH = 1• constant integer FWP_CONTAINS = 0

• constant integer GW_HWNDNEXT = 2

• TitleStart = parent.title// "Application Ping Pong"• mle_windows.text = ""• setnull(lpClassName)• setnull(lpWindowName)

• hWndTmp = FindWindow(lpClassName, lpWindowName)• Do Until hWndTmp = 0• //• // Make sure this window has no parent.• //• If GetParent(hWndTmp) = 0 Then• //• // Retrieve caption text from current window.• //• TitleTmp = Space(256)• nRet = GetWindowText(hWndTmp, TitleTmp,

Len(TitleTmp))

• If nRet > 0 Then• //• // Clean up return string, preparing for• // case-insensitive comparison.• //• TitleTmp = upper(Left(TitleTmp, nRet))• //• // Use appropriate method to determine if• // current window//s caption either starts• // with or contains passed string.• //• CHOOSE Case Method• Case FWP_STARTSWITH• If pos(TitleTmp, upper(TitleStart)) = 1 Then• FindWindowPartial = hWndTmp•

mle_windows.text += TitleTmp + ' HWND: ' + string(FindWindowPartial) + '~r~n'

• //Exit • End If• Case FWP_CONTAINS• If pos(TitleTmp, upper(TitleStart)) > 0 Then• FindWindowPartial = hWndTmp•

mle_windows.text += TitleTmp + ' HWND: ' + string(FindWindowPartial) + '~r~n'

• // Exit • End If• End CHOOSE• End If• End If• //• // Get next window in master window list and continue.• //• hWndTmp = GetWindow(hWndTmp, GW_HWNDNEXT)• Loop•




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Send ping

unsignedlong hndl_me,&hndl_you

hndl_me = handle(parent)hndl_you = long(em_win_handle.text)IF hndl_you > 0 THEN

// Send a ping to pbm_custom01 and transmit my handle and instance number in the params

send (hndl_du, 1024, hndl_ich, il_nummer ) ;ELSE

MessageBox("Oups", em_window.text + " is not running!")

END IF




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ue_ping

event ue_ping pbm_custom01Messagebox("Here is window:

"+string(handle(this))," Got a Ping from: " + string (wparam) + " with Instance No. "+string(lparam) )

// Pong to sender of the Ping (Event Id:1025)send (wparam, 1025, handle(this),

il_number ) ;

end event




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ue_pong

event ue_ping pbm_custom02Messagebox("Here is window:

"+string(handle(this))," Got the Pong from: " + string (wparam) + " with Instance No. "+string(lparam) )

end event




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Starting Syscommands

Start ScreensaverTo start the screen saver write:/*** WM_SYSCOMMAND 0x0112 274** SC_SCREENSAVE 0xF140 61760*/send(handle(This),274,61760,0)




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Maximize a frameTo maximize a window when it opens put the following

code into the Open event. CONSTANT Integer WM_SYSCOMMAND = 274CONSTANT UInt SC_MAXIMIZE = 61488//Send(Handle(This), WM_SYSCOMMAND, SC_MAXIMIZE,

0)




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CONSTANT Integer WM_SYSCOMMAND = 274

CONSTANT UInt SC_MAXIMIZE = 61488CONSTANT UInt SC_CLOSE = 61536 // 0xF060CONSTANT UInt SC_SCREENSAVE = 61760 // 0xF140 CONSTANT UInt SC_RESTORE = 61728 // 0xF120

CONSTANT UInt SC_MINIMIZE = 61472 // 0xF020

Send(Handle(w_test), WM_SYSCOMMAND, SC_MINIMIZE, long(0,0) )

…………send(Handle(Parent),16,0,0) //Close




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Ein Window ohne Titlebar verschieben

Um ein Window ohne Titlebar zu verschieben muss der folgende Code in das mousedown event.

CONSTANT uint WM_NCLBUTTONDOWN = 161CONSTANT uint HTCAPTION = 2Post( Handle( this ), WM_NCLBUTTONDOWN,

HTCAPTION, Long( xpos, ypos ) )




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Einige Events …message lowword long

Keyboard WM_KEYDOWN = 256WM_KEYUP = 257

ASCII Value of the nonsystem KeyBackspace

8Tab 9carriage return

13

0

Mouse WM_LBUTTONDBLCLK= 515

MK_LBUTTON0x0001

MK_RBUTTON0x0002

MK_SHIFT0x0004

MK_CONTROL0x0008

MK_MBUTTON0x0010

The low-order word specifies the x-coordinate of the cursor.

The high-order word specifies the y-coordinate of the cursor.

The coordinate is relative to the upper-left corner of the client area.

Slider WM_HSCROLL = 276WM_VSCROLL = 277

SB_LINEUP 0SB_LINELEFT 0SB_LINEDOWN 1SB_LINERIGHT 1SB_PAGEUP 2SB_PAGELEFT 2SB_PAGEDOWN 3SB_PAGERIGHT 3SB_THUMBPOSITION 4SB_THUMBTRACK 5SB_TOP 6SB_LEFT 6SB_BOTTOM 7SB_RIGHT 7SB_ENDSCROLL 8

0




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Kontakt

Sind noch Fragen offen?

Bei Rückfragen oder Anregungen bitte an:

Ludwin Feiten

Power PeopleInh. Ludwin Feiten

Am Borsigturm 50

D-13507 Berlin

fon +49 (0)30 43032350fax +49 (0)30 43032355

http://www.powerpeople.demailto:[email protected]


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Ludwin Feiten Window Message und PowerBuilder Ludwin Feiten Power People