Put API Controls in BAS Module

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VB5, VB6
When you put the API calls in a BAS module, they're easy to use with any form. You can
also import the module into other projects.

Option Explicit

Private Declare Function SetWindowLong Lib _
"user32" Alias "SetWindowLongA" (ByVal hWnd As _
Long, ByVal nIndex As Long, ByVal dwNewLong As _
Long) As Long

Private Declare Function GetWindowLong Lib _
"user32" Alias "GetWindowLongA" (ByVal hWnd As _
Long, ByVal nIndex As Long) As Long

Private Const GWL_STYLE = (-16)
Public ES As Long

Private Declare Function SendMessageAsLong Lib _
"user32" Alias "SendMessageA" (ByVal hWnd As _
Long, ByVal wMsg As Long, ByVal wParam As _
Long, ByVal lParam As Long) As Long

Private Declare Function SendMessageAsString Lib _
"user32" Alias "SendMessageA" (ByVal hWnd As _
Long, ByVal wMsg As Long, ByVal wParam As _
Long, ByVal lParam As String) As Long

Private Const Max_Chars_Per_Line = 80

Private Const EM_GETLINE = &HC4
Private Const EM_GETLINECOUNT = &HBA
Private Const EM_LINEFROMCHAR = &HC9
Private Const EM_LINELENGTH = &HC1
Private Const EM_UNDO = &HC7
Private Const ES_LOWERCASE = &H10&
Private Const ES_UPPERCASE = &H8&

Public Retn As Long

Public Function GetLineCount (Source As TextBox) _
As Long
GetLineCount = SendMessageAsLong(Source.hWnd, _
EM_GETLINECOUNT, 0, 0)
End Function

Public Function GetLineLength (Source As TextBox, _
LineNum As Long) As Long
GetLineLength = SendMessageAsLong(Source.hWnd, _
EM_LINELENGTH, LineNum, 0)
End Function

Public Function GetCurrentLineNumber (Source As _
TextBox) As Long
GetCurrentLineNumber = SendMessageAsLong _
(Source.hWnd, EM_LINEFROMCHAR, -1, 0)
End Function

Public Function GetLine (Source As TextBox, _
LineNumber As Long) As String
Dim ByteLo As Byte
Dim ByteHi As Byte
Dim Buffer As String
Dim ReturnedSize As Long
ByteLo = Max_Chars_Per_Line And (255)
ByteHi = Int(Max_Chars_Per_Line / 256)
Buffer = Chr$(ByteLo) + Chr$(ByteHi) + _
Space$(Max_Chars_Per_Line - 2)
ReturnedSize = SendMessageAsString _
(Source.hWnd, EM_GETLINE, LineNumber, Buffer)
GetLine = Left$(Buffer, ReturnedSize)
End Function

Public Function Undo (Source As TextBox) As Long
Undo = SendMessageAsLong(Source.hWnd, EM_UNDO, _
0, 0)
End Function

Public Sub GetES(Source As TextBox)
ES = GetWindowLong(Source.hWnd, GWL_STYLE)
End Sub

Public Function LowerCase (Source As TextBox) _
As Long
LowerCase = SetWindowLong(Source.hWnd, _
GWL_STYLE, ES Or ES_LOWERCASE)
End Function

Public Function UpperCase (Source As TextBox) _
As Long
UpperCase = SetWindowLong(Source.hWnd, _
GWL_STYLE, ES Or ES_UPPERCASE)
End Function

Public Function RestoreMixedCase (Source As _
TextBox) As Long
RestoreMixedCase = SetWindowLong(Source.hWnd, _
GWL_STYLE, ES)
'presume ES is correct
End Function

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