API function not working in .NET (works well in VB 6)

[Sakharam Phapale]

Hi All,

..NET application does not give correct result when I used following API
function .

{
Declare Function waveInGetNumDevs Lib "winmm.dll" () As Long

MsgBox(waveInGetNumDevs)

}

..NET gives it as 855400533......

VB6 gives it 1
VC++6 gives it 1

So why .NET is not giving correct one.

Thanks in advance

Sakharam Phapale

 

[Chris Dunaway]

Declare Function waveInGetNumDevs Lib "winmm.dll" () As Long

You are using the wrong function signature. In .Net, a long is 64 bits
whereas an Integer is 32. Your return type should be Integer, not Long.

--
Chris

dunawayc[AT]sbcglobal_lunchmeat_[DOT]net

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[Imran Koradia]

declare the function as:
Declare Function waveInGetNumDevs Lib "winmm.dll" () As Integer

Longs from VB6 convert to Integers in .NET (32-bit). Longs in .NET are
64-bit.

Imran.

 

[Sakharam Phapale]

Thanks

Chris & Imran

Regards
Sakharam Phapale

Declare Function waveInGetNumDevs Lib "winmm.dll" () As Long

You are using the wrong function signature. In .Net, a long is 64 bits
whereas an Integer is 32. Your return type should be Integer, not Long.

--
Chris

dunawayc[AT]sbcglobal_lunchmeat_[DOT]net

To send me an E-mail, remove the "[", "]", underscores ,lunchmeat, and
replace certain words in my E-Mail address.

 

[Herfried K. Wagner [MVP]]

.NET application does not give correct result when I used following API
function .

{
Declare Function waveInGetNumDevs Lib "winmm.dll" () As Long

'Long' maps to 'Int64' which is a 64-bit datatype. Use '...As Int32'
instead.