Option Explicit
' ===================================
' API Declares
'
Private Declare Function CreateDC Lib "gdi32.dll" Alias "CreateDCA" (ByVal lpDriverName As String, ByVal lpDeviceName As String, ByVal lpOutput As String, lpInitData As Long) As Long
Private Declare Function CreateCompatibleBitmap Lib "gdi32.dll" (ByVal hdc As Long, ByVal nWidth As Long, ByVal nHeight As Long) As Long
Private Declare Function CreateFontIndirect Lib "gdi32.dll" Alias "CreateFontIndirectA" (lpLogFont As LOGFONT) As Long
Private Declare Function SelectObject Lib "gdi32.dll" (ByVal hdc As Long, ByVal hObject As Long) As Long
Private Declare Function DeleteObject Lib "gdi32.dll" (ByVal hObject As Long) As Long
Private Declare Function GetTextExtentPoint32 Lib "gdi32.dll" Alias "GetTextExtentPoint32A" (ByVal hdc As Long, ByVal lpsz As String, ByVal cbString As Long, lpSize As SIZE) As Long
Private Declare Function MulDiv Lib "kernel32.dll" (ByVal nNumber As Long, ByVal nNumerator As Long, ByVal nDenominator As Long) As Long
Private Declare Function GetDC Lib "user32.dll" (ByVal hwnd As Long) As Long
Private Declare Function GetDeviceCaps Lib "gdi32.dll" (ByVal hdc As Long, ByVal nIndex As Long) As Long
Private Declare Function DeleteDC Lib "gdi32.dll" (ByVal hdc As Long) As Long
Private Const LOGPIXELSY As Long = 90
Public Type SIZE
cx As Long
cy As Long
End Type
Private Type LOGFONT
lfHeight As Long
lfWidth As Long
lfEscapement As Long
lfOrientation As Long
lfWeight As Long
lfItalic As Byte
lfUnderline As Byte
lfStrikeOut As Byte
lfCharSet As Byte
lfOutPrecision As Byte
lfClipPrecision As Byte
lfQuality As Byte
lfPitchAndFamily As Byte
lfFaceName As String * 32
End Type
' ===================================
'
' GetTextSize
' -> Measures the size in pixels of a string, given a particular font. This uses
' the GetTextExtentPoint32 API to measure the string. The API is defined as
' follows:
'
' GetTextExtendPoint(ByVal hdc As Long, ByVal lpsz As String, ByVal cbString As Long, lpSize As SIZE)
' hdc: The device context which is attached to the font to be used
' lpsz: The string to measure, based on the font contained in the hdc specified
' cbString: The length of the string which was passed in 'lpsz'
' lpSize: The SIZE structure which the measurements will be returned to
'
'
Public Function GetTextSize(text As String, font As StdFont) As SIZE
Dim tempDC As Long
Dim tempBMP As Long
Dim f As Long
Dim lf As LOGFONT
Dim textSize As SIZE
' Create a device context and a bitmap that can be used to store a
' temporary font object
tempDC = CreateDC("DISPLAY", vbNullString, vbNullString, ByVal 0)
tempBMP = CreateCompatibleBitmap(tempDC, 1, 1)
' Assign the bitmap to the device context
DeleteObject SelectObject(tempDC, tempBMP)
' Set up the LOGFONT structure and create the font
lf.lfFaceName = font.Name & Chr$(0)
lf.lfHeight = -MulDiv(font.SIZE, GetDeviceCaps(GetDC(0), LOGPIXELSY), 72)
lf.lfItalic = font.Italic
lf.lfStrikeOut = font.Strikethrough
lf.lfUnderline = font.Underline
If font.Bold Then lf.lfWeight = 800 Else lf.lfWeight = 400
f = CreateFontIndirect(lf)
' Assign the font to the device context
DeleteObject SelectObject(tempDC, f)
' Measure the text, and return it into the textSize SIZE structure
GetTextExtentPoint32 tempDC, text, Len(text), textSize
' Clean up (very important to avoid memory leaks!)
DeleteObject f
DeleteObject tempBMP
DeleteDC tempDC
' Return the measurements
GetTextSize = textSize
End Function