i'm working on native dll written in c++ uses mono show graphical user interface. i've written simple skeleton, works error under conditions.
first here c# code i'm calling mono api
using system; using system.collections.generic; using system.windows.forms; using system.threading; namespace testapp { static class program { // creates new thread , runs dialog() on it, // opens dialog window static void start() { console.writeline("running thread in mono"); thread t = new thread(new threadstart(dialog)); t.start(); } public static void dialog() { form f = new form(); f.showdialog(); f.dispose(); } } } this gets compiled testapp.dll
in c/c++ code following:
- load assembly
- locate start() method , run it
- enter endless loop reads input console
- when input string "open" received, run start() again
now, @ beginning, form opens, works (doesn't freeze on screen it's running in own thread) , can open more instances of form typing "open" @ prompt. exception thrown when close open forms , attempt open new 1 (typing "open" again after closing opened forms).
unhandled exception: system.outofmemoryexception: not enough memory complete operation [gdi+ status: outofmemory] @ system.drawing.gdiplus.checkstatus (status status) [0x00000] in <filename unknown>:0 @ system.drawing.graphics.fromhwnd (intptr hwnd) [0x00000] in <filename unknown>:0 @ system.windows.forms.xplatuiwin32.getautoscalesize (system.drawing.font font) [0x00000] in <filename unknown>:0 @ system.windows.forms.xplatui.getautoscalesize (system.drawing.font font) [0x00000] in <filename unknown>:0 @ system.windows.forms.form.getautoscalesize (system.drawing.font font) [0x00000] in <filename unknown>:0 @ system.windows.forms.form..ctor () [0x00000] in <filename unknown>:0 @ (wrapper remoting-invoke-with-check) system.windows.forms.form:.ctor () @ testapp.program.dialog () [0x00000] in <filename unknown>:0 @ system.threading.thread.startunsafe () [0x00000] in <filename unknown>:0 can me decrypt message? :)
somehow, when close last form window, guess mono decides unload/shut down critical component prevents me opening window after point in time.
here c++ (well, c actually) code use:
#define _crt_secure_no_warnings #include <mono/jit/jit.h> #include <mono/metadata/object.h> #include <mono/metadata/environment.h> #include <mono/metadata/assembly.h> #include <mono/metadata/debug-helpers.h> #include <stdlib.h> #include <stdio.h> #include <string.h> static void runthread(monodomain* domain, monoassembly* assembly) { monoimage* image = mono_assembly_get_image (assembly); monoclass *klass; monoobject *obj; monomethod *m = null, *start = null; void* iter = null; klass = mono_class_from_name (image, "testapp", "program"); // find method start() while ((m = mono_class_get_methods (klass, &iter))) { if (strcmp (mono_method_get_name (m), "start") == 0) { start = m; break; } } mono_runtime_invoke (start, null, null, null); } int main(int argc, char* argv[]) { monodomain *domain; const char *file; int retval; if (argc < 2) { fprintf (stderr, "please provide assembly load\n"); return 1; } file = argv [1]; domain = mono_jit_init (file); monoassembly *assembly; assembly = mono_domain_assembly_open (domain, file); if (!assembly) { printf("can not load assembly"); exit (2); } // open dialog runthread(domain, assembly); // endless loop char *p = new char[100]; while(1) { gets (p); // open dialog if( strcmp(p, "open") == 0) runthread(domain, assembly); } retval = mono_environment_exitcode_get (); mono_jit_cleanup (domain); return retval; }
after researching lot more can safely bug in mono. i've submitted bug report on matter.
this not problem regarding c api able recreate bug in c# code. when opening form first time on new thread mono seems initialization work. if thread stops running or runs out, reference of whatever lost, , calls open forms or dialogs after fail. unexpected , unwanted behavior.
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