CB_INSERTSTRING

All,

Why does it not work, I use VB 5.0, have one combo-box on my form and a command button. When I click on the button a string should be added to the combo (list) box.
But everytime I click 'rare' characters will be added such as |%ù but NOT the string, please help

The code :

Dim a&
Dim b as String

b=String$(255,Chr$(0))

b="Johan"

a=SendMessage(combo1.hWnd,CB_INSERTSTRING,-1,b)

What goes wrong ?
Regards
Johan Loos
jloos@glo.be
JohanlAsked:
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msimanCommented:
what so wrong with combo1.additem b ?
the easiest and the safest...
msiman
0
y96andhaCommented:
Try
 b ="Johan" & Chr(0)
instead and see if it helps.
0
msimanCommented:
btw: the reason for your problem, is
(I guess...) that in the sendmessage API
the last parameter should be integer, and here,
b is a string...
MSIMAN
0
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y96andhaCommented:
I assume that you have declared the parameters for SendMessage like this:

Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As String) As Long

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JohanlAuthor Commented:
To y96andha : Does not work with chr$(0) at the end.

To msiman and y96andha : yes, my last param is a string . I used the declaration as y96andha say.

strange thing ?
0
y96andhaCommented:
And you have also added a ByVal in front of lParam? Svensk?
0
twardCommented:
The Following works just fine for me:

Private Const CB_INSERTSTRING = &H14A
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As String) As Long

Dim a&
Dim b As String

b = String$(255, Chr$(0))

b = "Johan"

a = SendMessage(Combo1.hwnd, CB_INSERTSTRING, -1, b)
0

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Visual Basic Classic

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