DLL not loaded with LoadLibrary() function

[binary2]

LoadLibray returns 0 when I'm trying to load a dll file. I'm using Visual Studio 2017

#include "App.h"
#include <windows.h>
#include <iostream>
using namespace std;
typedef int(__stdcall *f_funci)(unsigned char, unsigned int);
int main(int argc, char **argv) {
    SetDllDirectory((LPCWSTR)L"C:\\xmrig-master\\build\\Debug");
    HINSTANCE hGetProcIDDLL = LoadLibrary(L"asm.dll");
    if (!hGetProcIDDLL) {
        cout << "could not load the dynamic library" << endl;
        //return EXIT_FAILURE;
    }else{
        cout << "cy" << endl;
    }
    /*
    f_funci assemblerMode = (f_funci)GetProcAddress(hGetProcIDDLL, "asm");
    if (!assemblerMode) {
        cout << "could not locate the function " << assemblerMode << GetLastError() << endl;
        //return EXIT_FAILURE;
    }
    cout << "assemblerMode() returned " << assemblerMode(1,0) << endl;
    //*/
    App app(argc, argv);
    return app.exec();
}

[2kaud]

Are you compiling as multi-byte or unicode? Your code seems a mixture. LoadLibrary() takes a parameter of LPCTSTR which means either LPCSTR if compiling as multi-byte or LPCWSTR if compiling as unicode. Try using ansi char strings instead of wide ones for SetDllDirectory() and LoadLibrary().

[VictorN]

LoadLibray returns 0 when I'm trying to load a dll file. I'm using Visual Studio 2017

And what does the GetLastError return in this case?

[binary2]

And what does the GetLastError return in this case?

Error code 126 (0x7E) The specified module could not be found.

[VictorN]

Error code 126 (0x7E) The specified module could not be found.

Well, could you answer the question 2kaud asked you in the post#2?

And, BTW, what does the SetDllDirectory(...) call return?

PS: I presume that your "asm.dll" does exist in the "C:\\xmrig-master\\build\\Debug" directory...

[binary2]

Are you compiling as multi-byte or unicode? Your code seems a mixture. LoadLibrary() takes a parameter of LPCTSTR which means either LPCSTR if compiling as multi-byte or LPCWSTR if compiling as unicode. Try using ansi char strings instead of wide ones for SetDllDirectory() and LoadLibrary().

I tried , still the same, dll cold not be found.

SetDllDirectory(...) returns 1. The dll is in the path

[2kaud]

What happens if you try

//SetDllDirectory((LPCWSTR)L"C:\\xmrig-master\\build\\Debug");
HINSTANCE hGetProcIDDLL = LoadLibrary("C:\\xmrig-master\\build\\Debug\\asm.dll");

[binary2]

What happens if you try

//SetDllDirectory((LPCWSTR)L"C:\\xmrig-master\\build\\Debug");
HINSTANCE hGetProcIDDLL = LoadLibrary("C:\\xmrig-master\\build\\Debug\\asm.dll");

I recieved the error:

Severity Code Description Project File Line Suppression State
Error C2664 'HMODULE LoadLibraryW(LPCWSTR)': cannot convert argument 1 from 'const char [36]' to 'LPCWSTR' xmrig C:\xmrig-master\src\xmrig.cpp 45

I added "L" to the address string

HINSTANCE hGetProcIDDLL = LoadLibrary(L"C:\\xmrig-master\\build\\Debug\\asm.dll");

I also tried:

HINSTANCE hGetProcIDDLL = LoadLibrary((LPCTSTR)"C:\\xmrig-master\\build\\Debug\\asm.dll");

In both cases the dll is not loaded

[2kaud]

cannot convert argument 1 from 'const char [36]' to 'LPCWSTR'

then your program is using unicode - and the whole program should be written as unicode. If

HINSTANCE hGetProcIDDLL = LoadLibrary(L"C:\\xmrig-master\\build\\Debug\\asm.dll");

which is unicode, still produces the same extended error (from GetLastError()), then it looks like the file asm.dll in the specified folder isn't present. Error 126 means that the specified module could not be found as in post #4. If this was a permission issue then a different error message would be produced. How was asm.dll produced? From another program, copied from somewhere else, downloaded?

[binary2]

asm.dll is coded in x86 assembly and compiled with Fasm

[2kaud]

Have you used dumpbin to show exports to verify that the .dll file is correct? From a VS2017 developer command prompt,

dumpbin /exports C:\xmrig-master\build\Debug\asm.dll

This should show something like

C:\MyProgs>dumpbin /exports sclcomm.dll
Microsoft (R) COFF/PE Dumper Version 7.10.6030
Copyright (C) Microsoft Corporation.  All rights reserved.


Dump of file sclcomm.dll

File Type: DLL

  Section contains the following exports for SclComm.dll

    00000000 characteristics
    58FB5F59 time date stamp Sat Apr 22 14:49:13 2017
        0.00 version
           1 ordinal base
          50 number of functions
          50 number of names

    ordinal hint RVA      name

          1    0 00013610 DictAct
          2    1 0000C210 ShowErrMsg
          3    2 0000C2D0 WGenMaint
{...}

  Summary

        1000 .data
        1000 .gfids
        5000 .rdata
        4000 .reloc
        1000 .rsrc
       1B000 .text

This is a sample output from dumpbin for the file sclcomm.dll

If this command doesn't produce something like above then there is an issue with asm.dll.

[binary2]

I checked with dumpbin and it shows something like you mentioned.
I checked GetLastError and I'm getting an error 193 (0xC1) %1 is not a valid Win32 application

[2kaud]

Attach asm.dll as a file to a post and I'll have a look at it.

[binary2]

Thank you

asm.zip

[2kaud]

This test code loads asm.dll OK on my system using VS2017.

#define WIN32_LEAN_AND_MEAN
#include <Windows.h>

#include <iostream>
using namespace std;

int main()
{
	HMODULE ll = LoadLibrary("asm.dll");

	if (ll == NULL) {
		cout << "asm.dll not loaded. Error code is " << GetLastError() << endl;
		return 1;
	}

	cout << "asm.dll loaded ok\n";
}

In this test case, asm.dll is in the same folder as the test .exe. Note that this is for multi-byte, not unicode build.

This is the unicode version

#define WIN32_LEAN_AND_MEAN
#include <Windows.h>

#include <iostream>
using namespace std;

int wmain()
{
	HMODULE ll = LoadLibrary(L"asm.dll");

	if (ll == NULL) {
		wcout << L"asm.dll not loaded. Error code is " << GetLastError() << endl;
		return 1;
	}

	wcout << L"asm.dll loaded ok\n";
}

In your build, you are building for x86 solution platform?