pinvoke.net: Edit: Structures.GSVersion

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Summary: This structure is filled in by the gsapi_revision function.

!!!!C# Definition:
 [StructLayout(LayoutKind.Sequential)]
 public struct GSVersion
 {
    public IntPtr product;
    public IntPtr copyright;
    public int revision;
    public int revisionDate;
 }

!!!!VB Definition:
 <StructLayout(LayoutKind.Sequential)> _
 Public Structure GSVersion
	Public product As IntPtr
	Public copyright As IntPtr
	Public revision As Integer
	Public revisionDate As Integer
 End Structure

!!!!User-Defined Field Types:
None.

!!!!Notes:
When starting to work with the Ghostscript Interpreter API (gsapi.dll), it is helpful to start by getting the gsapi_revision function to work.

Here is a sample of how the GSVersion structure is filled in by the gsapi_revision function.
GPL Ghostscript
Copyright Some Company
815
20040922

Documentation: http://www.ghostscript.com/doc/9.15/API.htm#revision

!!!!Tips & Tricks:
Originally this article showed the 'product' and 'copyright' fields as type 'string', but this causes a program crash when calling the gsapi_revision function (tested under VS2013 and 32-bit GPL Ghostscript v9.15).

Using IntPtr instead allows the struct to be passed correctly but requires a manual conversion. One way to accomplish this transparently is by making those two fields private and adding the following properties to the struct:

public String Product
 {
	get { return Marshal.PtrToStringAnsi(product); }
	set { product = Marshal.StringToHGlobalAnsi(value); }
 }

public String Copyright
 {
	get { return Marshal.PtrToStringAnsi(copyright); }
	set { copyright = Marshal.StringToHGlobalAnsi(value); }
 }