CODEWITHSUNDEEP
javac++jna
Anton Nakonechnyi
Anton Nakonechnyi

Reputation: 796

JNA invalid memory access

I'm testing JNA before wrapping big dll. Basic functions with different types args works. But when we wrap (even simple) approved code which has standard method mbstowcs_s inside, appears:

Exception in thread "main" java.lang.Error: Invalid memory access
    at com.sun.jna.Native.invokePointer(Native Method)
    at com.sun.jna.Function.invokePointer(Function.java:490)
    at com.sun.jna.Function.invokeString(Function.java:654)
    at com.sun.jna.Function.invoke(Function.java:427)
    at com.sun.jna.Function.invoke(Function.java:354)
    at com.sun.jna.Library$Handler.invoke(Library.java:244)
    at com.sun.proxy.$Proxy0.TestWCHAR_in(Unknown Source)
    at gov.nbu.App.main(App.java:85)

All versions 32bit.

Upvotes: 1

Views: 933

Answers (1)

Anton Nakonechnyi
Anton Nakonechnyi

Reputation: 796

Problem wasn't in JNA. It appears on Cpp side on some machines (my case). Here it is:

void TestVoid(void)
{
    wchar_t                     wcBuffer[2600]      = {};
    size_t                      szOut               = 0;
    std::string                 Path                = "This message for test WCHAR.";
    errno_t                     errCode             = 0;

    // Work:
    errCode = mbstowcs_s(&szOut, wcBuffer, sizeof(wcBuffer), (char*)Path.c_str(), Path.size());
    // Not work:
    errCode = mbstowcs_s(&szOut, wcBuffer, Path.size(), (char*)Path.c_str(), Path.size()); 
}

Upvotes: 0

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