[Dev-C++] help needed with calling dll from Visual basic

[Ni J. <ni_...@ba...>]

Hi, All.

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I am writing to ask for help from the Dev-C++ user community with the
problem of calling dll from visual basic.

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I wrote a dll by using Dev-C++ and the dll works fine with an interface
written in Dev-C++.  However, when I tried to call the dll from an =
interface
written in visual basic, I run into problem.

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1.	The dll contains a function with prototype shown below. It
concatenates the time to the string "name".

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Void reportTime (char *name);

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            I call the function in dll from visual basic by using the
following declare statement

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            Private Declare Sub reportTime Lib =
"c:\dlltest-4\dlltest-4.dll"
(ByVal name As String)

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            I get an error message "bad dll calling convention". =20

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2.	So I made some change to the prototype of the function in dll by
adding _stdcall as shown below.

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Void _stdcall reportTime (char *name);

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The declare statement is the same in the visual basic interface.

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This time, I do not get the error message shown above and I can tell =
that
the string "name" is passed into dll and the function can concatenate =
the
time to the string. However, after the dll returns the control back to =
the
interface, the string "name" in the interface does not reflect the
manipulation done in dll.  I do not know what to do.=20

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Thank you in advance for your time and help.

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Jean Ni

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