Hi there, I'm trying to create a small VB app to apply a color
transform fom RGB to CMYK between two different profiles. I have put
together the following code:
In my module I have:
'-----------------------------------
Public Type TRGB8
r As Long
g As Long
b As Long
End Type
Public Type TCMYK8
c As Long
m As Long
y As Long
k As Long
End Type
Public Enum cmsIntent
cmsPerceptual = 0
cmsRelativeColorimetric = 1
cmsSaturation = 2
cmsAbsoluteColorimetric = 3
End Enum
Public Const lTYPE_RGB_8 As Long = 262169
Public Const lTYPE_CMYK_8 As Long = 393249
Declare Function cmsOpenProfileFromFile Lib "lcms.dll" _
(ByVal sProfilePath As String, ByVal sAccess As String) As Long
Declare Function cmsCloseProfile Lib "lcms.dll" _
(ByVal lProfileHandle As Long) As Boolean
Public Declare Function cmsCreateTransform Lib "lcms.dll" _
(ByVal lInputProfile As Long, ByVal lInputFormat As Long, _
ByVal lOutputProfile As Long, ByVal lOutputFormat As Long, _
ByVal iIntent As Integer, ByVal lFlags As Long) As Long
Declare Function cmsDoTransform Lib "lcms.dll" _
(ByVal lTransformHandle As Long, ByRef lInputBuffer As TRGB8, ByRef
lOutputBuffer As TCMYK8, ByVal lSize As Long)
Declare Function cmsDeleteTransform Lib "lcms.dll" _
(ByVal lTransformHandle As Long)
'------------------------------------------------------------------
and in form1 I have:
'------------------------------------------------------------------
Private Sub Form_Load()
Dim lInputProfile As Long
Dim lOutputProfile As Long
Dim lTransformHandle As Long
Dim lOutputDib As Long
Dim T_RGB As TRGB8
Dim T_CMYK As TCMYK8
lInputProfile =
cmsOpenProfileFromFile("c:\winnt\system32\spool\drivers\color\sRGB
Color Space Profile.icm", "r")
lOutputProfile =
cmsOpenProfileFromFile("c:\winnt\system32\spool\drivers\color\Photoshop5DefaultCMYK.icc",
"r")
' Create Transform
lTransformHandle = cmsCreateTransform(lInputProfile, lTYPE_RGB_8,
lOutputProfile, lTYPE_CMYK_8, cmsPerceptual, 0)
T_RGB.r = 1
T_RGB.g = 1
T_RGB.b = 1
cmsDoTransform lTransformHandle, T_RGB, T_CMYK, 1
cmsDeleteTransform lTransformHandle
cmsCloseProfile lInputProfile
cmsCloseProfile lOutputProfile
End Sub
----------------------------------------------------------------------------------
I have no idea why, but VB always completely crashes and closes on the line:
cmsDoTransform lTransformHandle, T_RGB, T_CMYK, 1
and if I comment out that line, it crashes on
cmsDeleteTransform lTransformHandle
Has anyone successfully been able to use lcms in VB yet? Thanks to
anyone who can help me out!!
Tyler
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