6:02 p.m.
Hello gretl users!
I'm trying to open a ".gdt" file calling gretl_read_native_data (system
info's: "gretl 1.9.6 - build date 2011-10-17" on "Windows 7 Ultimate -
Service Pack 1") from a C# class: the result is always an error code 12 (it
seems that something is wrong into the file path name ...).
Follows a significant excerpt of my code
[Start C# code]
...
IntPtr dset;
[DllImport(@"C:\Program Files (x86)\gretl\libgretl.dll")]
internal static extern void libgretl_init();
[DllImport(@"C:\Program Files (x86)\gretl\libgretl.dll")]
internal static extern IntPtr create_new_dataset(IntPtr pZ, int nvar, int
nobs, int markers);
[DllImport(@"C:\Program Files (x86)\gretl\libgretl.dll", CharSet =
CharSet.Unicode)]
internal static extern int gretl_read_native_data(string fname, IntPtr
pdset);
...
int err;
string fname = @"C:\Program Files (x86)\gretl\data\misc\australia.gdt";
libgretl_init();
dset = datainfo_new();
err = gretl_read_native_data(fname, dset);
...
[End C# code]
Where am I wrong?
Regards, Filippo.
1:31 p.m.
Hey Flippo
I'm also trying to connect C# with gretl api. My P/Invoke signature is like
so
[DllImportAttribute(Constants.gretlLibraryPath, EntryPoint =
"gretl_read_native_data", CallingConvention = CallingConvention.Cdecl)]
public static extern int gretl_read_native_data(string fileName, ref
Structures.DATASET dataset);
you have to mind that callingConversation must be Cdecl.
Besides you have to marshal DATASET, like so
// Call Gretl Api new datasetIntPtr pointer =
GretlCore.NativeGretl.Methods.datainfo_new();// Marshal pointer to
datasetStructures.DATASET dataset =
(Structures.DATASET)Marshal.PtrToStructure(pointer,
typeof(Structures.DATASET));
You can also try to call directly IntPtr.
Hope this helps.
LP Simon
2011/12/30 Filippo Bonsignori <filippo.bonsignori(a)logobject.ch>
Hello gretl users!
I'm trying to open a ".gdt" file calling gretl_read_native_data (system
info's: "gretl 1.9.6 - build date 2011-10-17" on "Windows 7 Ultimate
-
Service Pack 1") from a C# class: the result is always an error code 12 (it
seems that something is wrong into the file path name ...).
Follows a significant excerpt of my code
[Start C# code]
...
IntPtr dset;
[DllImport(@"C:\Program Files (x86)\gretl\libgretl.dll")]
internal static extern void libgretl_init();
[DllImport(@"C:\Program Files (x86)\gretl\libgretl.dll")]
internal static extern IntPtr create_new_dataset(IntPtr pZ, int nvar, int
nobs, int markers);
[DllImport(@"C:\Program Files (x86)\gretl\libgretl.dll", CharSet =
CharSet.Unicode)]
internal static extern int gretl_read_native_data(string fname, IntPtr
pdset);
...
int err;
string fname = @"C:\Program Files (x86)\gretl\data\misc\australia.gdt";
libgretl_init();
dset = datainfo_new();
err = gretl_read_native_data(fname, dset);
...
[End C# code]
Where am I wrong?
Regards, Filippo.
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LP Simon
4:09 a.m.
Il 30/12/2011 19:31, simon rupar ha scritto:
Hey Flippo
I'm also trying to connect C# with gretl api. My P/Invoke signature is
like so
[DllImportAttribute(Constants.gretlLibraryPath, EntryPoint =
"gretl_read_native_data", CallingConvention = CallingConvention.Cdecl)]
public static extern int gretl_read_native_data(string fileName, ref
Structures.DATASET dataset);
you have to mind that callingConversation must be Cdecl.
Besides you have to marshal DATASET, like so
// Call Gretl Api new dataset
IntPtr pointer = GretlCore.NativeGretl.Methods.datainfo_new();
// Marshal pointer to dataset
Structures.DATASET dataset =
(Structures.DATASET)Marshal.PtrToStructure(pointer,typeof(Structures.DATASET));
You can also try to call directly IntPtr.
Hope this helps.
LP Simon
Hello Simon and thank you for your answer!
Following your hint has been useful for me ... but the problem is not in
the CallingConvention setting: I found (finally) the solution just
removing the CharSet setting in the P/Invoke signature of
gretl_read_native_data method.
About this point I have to add some details:
1. In the code excerpt I had reported in my msg, CharSet was set to
CharSet.Unicode ... the code doesn't work also using CharSet.Auto
2. A similar code (with CharSet=CharSet.Auto) has been run successfully
using a Linux machine (system info's: "gretl 1.9.5 - build date
2011-09-11" on "Linux 3.0.0-14 x86_64")
Regards Filippo.
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participants (2)
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Filippo Bonsignori -
simon rupar