C++代码正常工作，但在从Java（JNI）调用时不起作用

Question

当调用ExitWindowsEX Windows API函数时，我曾经有一些特权问题。

所以我写了下面的代码来获得特权：

这工作正常，在C++

#include <cstdlib> 
#include <windows.h> 
#include <iostream> 


using namespace std; 

/* 
* 
*/ 

int MyExitWindows(int flag, int reason); 

int main(int argc, char** argv) { 
    MyExitWindows(EWX_SHUTDOWN, 0); 
} 

int MyExitWindows(int flag, int reason) { 
    HANDLE hToken; 
    TOKEN_PRIVILEGES tkp; 

    // Get a token for this process.  

    if (!OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken)) 
    return GetLastError(); 

    // Get the LUID for the shutdown privilege.  

    LookupPrivilegeValue(NULL, SE_SHUTDOWN_NAME, &tkp.Privileges[0].Luid); 

    tkp.PrivilegeCount = 1; // one privilege to set   
    tkp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; 

    // Get the shutdown privilege for this process.  

    AdjustTokenPrivileges(hToken, FALSE, &tkp, 0, 
      (PTOKEN_PRIVILEGES) NULL, 0); 

    // Cannot test the return value of AdjustTokenPrivileges.  

    ExitWindowsEx(flag, reason); 
    if (GetLastError() != ERROR_SUCCESS) { 
    return GetLastError(); 
    } 

    return 0; 
} 

但这并不当我把它从Java

工作

#include <jni.h> 
#include <cstdlib> 
#include <windows.h> 
#include "com_ehsunbehravesh_jshutdown_system_Shutdowner.h" 

using namespace std; 

int MyExitWindows(int flag, int reason); 

JNIEXPORT jint JNICALL Java_com_ehsunbehravesh_jshutdown_system_Shutdowner_exitWindowsEx 
(JNIEnv *env, jobject obj, jlong flag, jlong reason) { 
    return MyExitWindows(flag, reason); 
} 

int MyExitWindows(int flag, int reason) { 
    HANDLE hToken; 
    TOKEN_PRIVILEGES tkp; 

    // Get a token for this process.  

    int cpid = GetCurrentProcessId(); 
    printf("%d", cpid); 
    if (!OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken)) 
    return GetLastError(); 

    // Get the LUID for the shutdown privilege.  

    LookupPrivilegeValue(NULL, SE_SHUTDOWN_NAME, &tkp.Privileges[0].Luid); 

    tkp.PrivilegeCount = 1; // one privilege to set   
    tkp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; 

    // Get the shutdown privilege for this process.  

    AdjustTokenPrivileges(hToken, FALSE, &tkp, 0, 
      (PTOKEN_PRIVILEGES) NULL, 0); 

    // Cannot test the return value of AdjustTokenPrivileges.  

    ExitWindowsEx(flag, reason); 
    if (GetLastError() != ERROR_SUCCESS) { 
    return GetLastError(); 
    } 

    return 0; 
} 

Answer 1

有什么理由不使用System.exit(int)？

Java尝试控制应用程序的关闭，也许它试图阻止您以其他方式执行此操作。