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09.23.2008 at 08:12PM PDT, ID: 23757315
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7.0

ERROR 49 "Bad DLL Calling Convention"

Asked by nushahid in Visual Basic Programming

I have an error 49: Bad DLL calling convention while running the demo application of fingerprint reader in Visual Basic 6.0.


The line where error occurred is following: (in modService.bas file)

FpImageToBitmap hImageDC, hImageBMP, g_bioImageControl.hImage

The hImageDC, hImageBMP and g_bioImageControl.hImage are declared as follows:

Dim hImageDC as Long
Dim hImageBMP as Long

Private Type bioImageControl
    hImage As Long              '  Contains a pointer to bioImage
    hDynamicImage As Long
    bLastStretchMode As Boolean
    bInvertFlag As Boolean
    bStretchFlag As Boolean
    bDynamicFlag As Boolean
    bShowError As Boolean
    bShowMessage As Boolean
    hwnd As Long
    hdc As Long
    fpRes As Long
    fpInfo As String
    bShowPrompt As Boolean
    szPath As String
End Type

Private g_bioImageControl As bioImageControl


This function FpImageToBitmap is declared in modBsdk.bas file as following:

Public Declare Function FpImageToBitmap Lib "Bsdk.dll" (ByVal hdc As Long, ByRef phBitmap As Long, ByVal hImage As Long) As Long

The function definition is in BSdk.dll which is placed in system32 folder.

 
The two files of the demo application are attached and the lines at which the error occurs are bold.

Kindly tell me how can I remove this error.
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Attachments:
 
From which the function is called
 
 
DLL functions declarations file
 
 
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[+][-]09.23.2008 at 09:50PM PDT, ID: 22556825

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About this solution

Zone: Visual Basic Programming
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Solution Provided By: mrdany
Participating Experts: 1
Solution Grade: B
 
 
[+][-]09.23.2008 at 10:11PM PDT, ID: 22556937

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20081112-EE-VQP-42 / EE_QW_EXPERT_20070906