Call mono-2.0-sgen.dll with syscall got "not a valid Win32 application"

Question

I want to execute HelloWorldConsole.exe with an shipped Mono Framework through Go. So I want to call mono-2.0-sgen.dll funtion "mono_main" to execute the exe. mono-2.0-sgen.dll is a PE32 executable for MS Windows, see. But I get the error "not a valid Win32 application" _ = os.Setenv("MONO_PATH", `\mono\lib\mono\4.5;C:\DEV\HelloWorldConsole\HelloWorldConsole\bin\Debug`) _ = os.Setenv("MONO_CFG_DIR", `"C:\Program Files (x86)\Mono\etc"`) _ = os.Setenv("MONO_CONFIG", `"C:\Program Files (x86)\Mono\etc\mono\config"`) mono := `C:\Program Files (x86)\Mono\bin\mono-2.0-sgen.dll` app := `C:\DEV\HelloWorldConsole\HelloWorldConsole\bin\Debug\HelloWorldConsole.exe` fmt.Println("Execute") var mod = syscall.NewLazyDLL(mono) var proc = mod.NewProc("mono_main") ret, _, _ := proc.Call(0, uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr("mono.exe"))), uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(app))) ) Same behavior with windows.NewLazySystemDLL dll := windows.NewLazySystemDLL(mono) lazyProc := dll.NewProc("mono_main") lazyProc.Call() Function Name Full Error: panic: Failed to load C:\Program Files (x86)\Mono\bin\mono-2.0-sgen.dll: %1 is **not a valid Win32 application**. JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

Answer 1

%1 is not a valid Win32 application The error %1 is not a valid Win32 application is a discription of Win32 error code from windows itself. The Win32 error code itself is 0x000000C1 ERROR_BAD_EXE_FORMAT, see docs.microsoft.com. BAD_EXE_FORMATmeans you call a x86 dll within a x64 process. You must use the x86 variant of Go, e.g. go1.12.1.windows-386.zip from https://golang.org/dl/. Now must change the GOROOT and PATH to the extracted bin folder and then you are ready to go. Type of Arguments When you call mono_main you need to consume the this function in the right way. If you take an look at the implementation you see that the signature is int mono_main (int argc, char* argv[]);. argc and argv is a widly used pattern, see here. Working Sample func main() { _ = os.Setenv("MONO_PATH", `C:\DEV\HelloWorldConsole\HelloWorldConsole\bin\x86\Debug\mono\lib\mono\4.5;C:\DEV\HelloWorldConsole\HelloWorldConsole\bin\x86\Debug\`) _ = os.Setenv("MONO_CFG_DIR", `C:\DEV\HelloWorhpm.goldConsole\HelloWorldConsole\bin\x86\Debug\mono\etc`) _ = os.Setenv("MONO_CONFIG", `C:\DEV\HelloWorldConsole\HelloWorldConsole\bin\x86\Debug\mono\etc\mono\config`) _ = os.Chdir(`C:\DEV\HelloWorldConsole\HelloWorldConsole\bin\x86\Debug\`) mono := `C:\DEV\HelloWorldConsole\HelloWorldConsole\bin\x86\Debug\mono\bin\mono-2.0-sgen.dll` // https://github.com/mono/mono/blob/c5b88ec4f323f2bdb7c7d0a595ece28dae66579c/mcs/tools/mkbundle/template_main.c#L1 dll := windows.NewLazySystemDLL(mono) lazyProc := dll.NewProc("mono_main") dotNetAssembly := []byte(`HelloWorldConsole.exe`) var argumentData [260]byte ptr := unsafe.Pointer(&argumentData) copy(argumentData[:], dotNetAssembly) args := [2]uintptr{0, uintptr(ptr)} _, _, _ = lazyProc.Call(2, uintptr(unsafe.Pointer(&args))) }