Mono crashes #8588
Comments
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Can the files be submited differently to github, i.e. w/o a dropbox login? |
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The first param of pos_open is [DllImport("libpos.so.1.24.0", EntryPoint = "pos_set", CallingConvention = CallingConvention.Cdecl)]
private extern static ```Boolean Set(ref IntPtr handle_p, string param, string val);has to be replaced by [DllImport("libpos.so.1.24.0", EntryPoint = "pos_set", CallingConvention = CallingConvention.Cdecl)]
private extern static Boolean Set(IntPtr handle_p, string param, string val);(remove the ref attribute) |
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I've filled project to git here https://github.com/Rombersoft/pos_terminal |
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There is such method on C lang bool pos_get_first(POS_HANDLE handle, char *param, int param_size,
char *val, int val_size);Is right PInvoke? [DllImport("libpos.so.1.24.0", EntryPoint = "pos_get_first", CallingConvention = CallingConvention.Cdecl)]
private extern static Boolean GetFirst(IntPtr handle_p, string param, Int32 paramSize, string val, Int32 valSize);because I get next Error |
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string type suit well for So, if the pointers may be freed by mono, use StringBuilder like this [DllImport("libpos.so.1.24.0", EntryPoint = "pos_get_first", CallingConvention = CallingConvention.Cdecl)]
private extern static Boolean GetFirst(IntPtr handle_p, StringBuilder param, Int32 paramSize, StringBuilder val, Int32 valSize);else, use IntPtr and marshal it to a string. [DllImport("libpos.so.1.24.0", EntryPoint = "pos_get_first", CallingConvention = CallingConvention.Cdecl)]
private extern static Boolean GetFirst(IntPtr handle_p, IntPtr param, Int32 paramSize, IntPtr val, Int32 valSize);Detailed informations on this at: http://www.mono-project.com/docs/advanced/pinvoke/ |
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I've already written this article and when I use StringBuilder function does not set it value and stringBuilder.ToString() returns empty string |
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SEcond variant with IntPtr is not suitable because IntPtr must has value before using in in function private extern static Boolean GetFirst(IntPtr handle_p, IntPtr param, Int32 paramSize, IntPtr val, Int32 valSize); |
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I have C library for working with this pos_terminal https://www.verifone.com/en/us/devices/countertops-pin-pads/vx-520
I use
And my application crashes after second method calling
Steps to Reproduce
Project is here https://www.dropbox.com/s/8l0czx4091y1usj/BugZilla.tar.gz?dl=0
Dependencies and manuals are here https://www.dropbox.com/s/ip59ivgkkaid7st/posapi-centos-x64_1.24.tar.bz2?dl=0
Current Behavior
Expected Behavior
On which platforms did you notice this
[ ] macOS
[*] Linux
[ ] Windows
Version Used:
Debian 9 Stretch
Stacktrace
https://bugzilla.xamarin.com/show_bug.cgi?id=46511
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