Hi Paul, Do you #include "jni.h" in mary.c ? What I've seen used in some projects is using dynamic loading with typedef int (*t_JNI_CreateJavaVM) (JavaVM**, void**, JavaVMInitArgs*); ... t_JNI_CreateJavaVM *p=(t_JNI_CreateJavaVM) GetProcAddress(LoadLibrary(jvm_dll_path),"JNI_CreateJavaVM"); -- bye rastos On 22/09/2020 06.11, Paul Edwards wrote: > Hello. > > I am trying to get a mingw32 program to call Java, > using JNI. I am getting an error about not being > able to find _imp__JNI_CreateJavaVM at 12 > > I have got conflicting information from the web > as to whether the jvm.lib that is supplied in the > JDK should work or not. Some information says > that it won't work, because the function is > stdcall and mingw32 does not prefix the function > name with an underscore, while MSVC does. > > Note that the above reference only has one > underscore, instead of the two that show up > when running "nm" on jvm.lib: > > 00000000 I __imp__JNI_CreateJavaVM at 12 > U __IMPORT_DESCRIPTOR_jvm > 00000000 T _JNI_CreateJavaVM at 12 > > I have tried a lot of searches and a lot of > experiments, but nothing successful. I still > can't even answer the basic question of > whether it is meant to work out of the box > or not. Or whether I need to construct my > own "lib" file. Any ideas? Relevant technical > info below. > > Thanks. Paul. > > > C:\paul\devel\jnitest>mingw32-make > mingw32-gcc -o mary.exe \ > -L "C:\Program Files (x86)\Java\jdk1.8.0_221\lib" \ > -ljvm \ > -I "C:\Program Files (x86)\Java\jdk1.8.0_221\include" \ > -I "C:\Program Files (x86)\Java\jdk1.8.0_221\include\win32" \ > mary.c > > c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: > C:\Users\xxx\AppData\Local\Temp\ccqlQomh.o:mary.c:(.text+0x3c): undefined > reference to `_imp__JNI_CreateJavaVM at 12' > collect2.exe: error: ld returned 1 exit status > Makefile:7: recipe for target 'mary.exe' failed > mingw32-make: *** [mary.exe] Error 1 > > > C:\paul\devel\jnitest>mingw32-gcc --version > mingw32-gcc (MinGW.org GCC-8.2.0-5) 8.2.0 > > > mary.c: > > ret = JNI_CreateJavaVM(&jvm, (void**)&env, &args); > > _______________________________________________ > MinGW-Users mailing list > MinGW****@lists***** > > This list observes the Etiquette found at > http://www.mingw.org/Mailing_Lists. > We ask that you be polite and do the same. Disregard for the list etiquette may > cause your account to be moderated. > > _______________________________________________ > You may change your MinGW Account Options or unsubscribe at: > https://lists.osdn.me/mailman/listinfo/mingw-users > Also: mailto:mingw****@lists*****?subject=unsubscribe
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