Linking a C++ application to a Java API

Question

Linking a C++ application to a Java API

Having developed a C++ AES algorithm program to encrypt text files on the server machine, I am now looking to expand its capabilities by enabling file uploads from different machines using a web app.

The web app is created in Java and will interface with the server machine through a Java-based API. When a user clicks the upload button on the web app, it triggers the API to transfer the file to the server machine. So far, this process has been successful for files within the same LAN.

However, I have hit a roadblock. I want the C++ program to automatically recognize when a new file is uploaded to the machine, retrieve it, and initiate the encryption process. How can this be achieved?

My initial thought was to potentially utilize JavaScript, but I am unsure of how to implement this solution.

If more information is needed, please do not hesitate to ask. Any advice or guidance on this matter would be greatly appreciated. Thank you!

javascript java c++api encryption

Answer 1

Answer №1

Could it be that your Java program is responsible for downloading the file and storing it in a specific directory? If so, why not consider developing a JNI wrapper (a jar library) for your C++ application? Once the download is complete, you can simply instruct your library where to find the file and encrypt it.

Additionally, have you thought about encrypting the byte stream you are receiving and saving the already encrypted bytes directly to disk?

Answer 2

Could it be that your Java program is responsible for downloading the file and storing it in a specific directory? If so, why not consider developing a JNI wrapper (a jar library) for your C++ application? Once the download is complete, you can simply instruct your library where to find the file and encrypt it.

Additionally, have you thought about encrypting the byte stream you are receiving and saving the already encrypted bytes directly to disk?

Answer 3

Answer №2

Providing assistance based on my understanding of your query: https://msdn.microsoft.com/enus/library/windows/desktop/aa365261(v=vs.85).aspx

An illustration of this is shown below:

#include <windows.h>
#include <stdio.h>
#define DIR_PATH L"C:\\temp\\files"

void encrypt(WCHAR* fileName);
OVERLAPPED overlapped = {0};
union {
    FILE_NOTIFY_INFORMATION i;
    char d[sizeof(FILE_NOTIFY_INFORMATION)+MAX_PATH];
} fni;

int main()
{
    HANDLE hDirectory;
    BOOL res;
    DWORD bytesReturned;

    // Establish a handle for the designated directory
    hDirectory =  CreateFileW(DIR_PATH, FILE_LIST_DIRECTORY | GENERIC_READ,FILE_SHARE_READ | FILE_SHARE_WRITE,NULL,OPEN_EXISTING, FILE_FLAG_OVERLAPPED | FILE_FLAG_BACKUP_SEMANTICS,NULL);
    overlapped.hEvent = CreateEvent(0,0,0,0);

    // Continuously monitor activities
    while (1)
    {
        res = ReadDirectoryChangesW(hDirectory,(LPVOID)&fni,sizeof(fni),FALSE,FILE_NOTIFY_CHANGE_SIZE,
                                                                &bytesReturned,&overlapped,NULL);
        // Validate for errors
        if ( res == 0)
        {
            printf("error: %d\n",GetLastError());
            return 1;
        }

        // Check for new file creations within the directory
        GetOverlappedResult(hDirectory,&overlapped,&bytesReturned,TRUE);
        if (fni.i.Action != 0)
            encrypt(fni.i.FileName);
    }
}

//The encryption process takes place here
void encrypt(WCHAR* fileName)
{
    wprintf(L"Insert Encryption Code!\nFileName=%ls\n",fileName);
}

Replace the DIR_PATH variable and make modifications to the encrypt function as needed.

(This marks my first response in this forum ^^)

Answer 4

Providing assistance based on my understanding of your query: https://msdn.microsoft.com/enus/library/windows/desktop/aa365261(v=vs.85).aspx

An illustration of this is shown below:

#include <windows.h>
#include <stdio.h>
#define DIR_PATH L"C:\\temp\\files"

void encrypt(WCHAR* fileName);
OVERLAPPED overlapped = {0};
union {
    FILE_NOTIFY_INFORMATION i;
    char d[sizeof(FILE_NOTIFY_INFORMATION)+MAX_PATH];
} fni;

int main()
{
    HANDLE hDirectory;
    BOOL res;
    DWORD bytesReturned;

    // Establish a handle for the designated directory
    hDirectory =  CreateFileW(DIR_PATH, FILE_LIST_DIRECTORY | GENERIC_READ,FILE_SHARE_READ | FILE_SHARE_WRITE,NULL,OPEN_EXISTING, FILE_FLAG_OVERLAPPED | FILE_FLAG_BACKUP_SEMANTICS,NULL);
    overlapped.hEvent = CreateEvent(0,0,0,0);

    // Continuously monitor activities
    while (1)
    {
        res = ReadDirectoryChangesW(hDirectory,(LPVOID)&fni,sizeof(fni),FALSE,FILE_NOTIFY_CHANGE_SIZE,
                                                                &bytesReturned,&overlapped,NULL);
        // Validate for errors
        if ( res == 0)
        {
            printf("error: %d\n",GetLastError());
            return 1;
        }

        // Check for new file creations within the directory
        GetOverlappedResult(hDirectory,&overlapped,&bytesReturned,TRUE);
        if (fni.i.Action != 0)
            encrypt(fni.i.FileName);
    }
}

//The encryption process takes place here
void encrypt(WCHAR* fileName)
{
    wprintf(L"Insert Encryption Code!\nFileName=%ls\n",fileName);
}

Replace the DIR_PATH variable and make modifications to the encrypt function as needed.

(This marks my first response in this forum ^^)

Linking a C++ application to a Java API

Answer №1

Answer №2

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