Support DLL ordinal value function

[kobevaliant]

As we know, VC can hide function name in dll by ordinal value. I have checked the source code.

w32_find_entry(JNIEnv* env, HANDLE handle, const char* funname) {
  void* func = NULL;
  if (handle != GetModuleHandle(NULL)) {
    func = GetProcAddress(handle, funname);
  }
  else {

So I request a feature about ordinal value function support. Thank you.

[twall]

Why is a FunctionMapper not sufficient for this purpose?

On Apr 13, 2016, at 5:22 AM, kobevaliant [email protected] wrote:

As we know, VC can hide function name in dll by ordinal value. I have checked the source code.

w32_find_entry(JNIEnv* env, HANDLE handle, const char* funname) {
void* func = NULL;
if (handle != GetModuleHandle(NULL)) {
func = GetProcAddress(handle, funname);
}
else {

So I request a feature abount ordinal value function support. Thank you.

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[kobevaliant]

Because FunctionMapper can only translate function name, But ordinal value is not a string type.
According to
https://msdn.microsoft.com/en-us/library/windows/desktop/ms683212%28v=vs.85%29.aspx

FARPROC WINAPI GetProcAddress(
  _In_ HMODULE hModule,
  _In_ LPCSTR  lpProcName
);

lpProcName [in]

The function or variable name, or the function's ordinal value. If this parameter is an ordinal value, it must be in the low-order word; the high-order word must be zero.

[twall]

You should be able to make this work by writing a mapping for GetProcAddress() which takes an int/long ordinal as the second parameter, and then use the returned Pointer as the basis to create a Function object. I don’t think there’d have to be any native code involved.

On Apr 21, 2016, at 2:59 AM, kobevaliant [email protected] wrote:

Because FunctionMapper can only translate function name, But ordinal value is not a string type.
According to
https://msdn.microsoft.com/en-us/library/windows/desktop/ms683212%28v=vs.85%29.aspx

FARPROC WINAPI GetProcAddress(
In HMODULE hModule,
In LPCSTR lpProcName
);

lpProcName [in]

The function or variable name, or the function's ordinal value. If this parameter is an ordinal value, it must be in the low-order word; the high-order word must be zero.

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[kobevaliant]

Ok I see, Thank you.

[bwRavencl]

I require the same feature.
@kobevaliant did @twall's proposal work for you?
And how exactly can the function object be created from the pointer returned by GetProcAddress()?

Edit: The proposal indeed works.
Dirty example for anyone in need:

private interface Kernel32 extends Library {
    public Pointer GetProcAddress(HMODULE hModule, long lpProcName);
}

...

Native.loadLibrary("xinput1_3.dll", Library.class);
HMODULE hModule = com.sun.jna.platform.win32.Kernel32.INSTANCE.GetModuleHandle("xinput1_3.dll");
Kernel32 kernel32 = (Kernel32) Native.loadLibrary(Kernel32.class);
Function function = Function.getFunction(kernel32.GetProcAddress(hModule, 100));
function.invoke(new Object[] { controllerId, cs });

[matthiasblaesing]

Needed basic functions were merged as #705, #689 (comment) describes a way and provides code how this basic work can be used to create interface based bindings to ordinal value functions.