Windows DLL injector in C doesn't inject the DLL

Question

I am trying to write a DLL injector to perform a DLL injector on a calculator process.

I wrote the DLL injector program in C and the DLL but the injector dosent inject the DLL or any other DLL (I tried to take some random windows DLL that the calculator doesn't use).

#include <stdio.h>
#include <Windows.h>

int main() {
    LPCSTR dllpath = "C:\\Users\\......\\Dll1.dll";
    printf("#### Starting ####\n");

    printf("step 1: attaching the target process memory\n");
    HANDLE hProcess = OpenProcess( 
        PROCESS_ALL_ACCESS, 
        FALSE, 
        6456 // target process id
    );
    if (hProcess != NULL) {
        printf("step 2: allocate the target memory process\n");
        LPVOID dllPathMemoryAddr = VirtualAllocEx(
            hProcess, 
            NULL, 
            strlen(dllpath), 
            MEM_RESERVE | MEM_COMMIT, 
            PAGE_EXECUTE_READWRITE 
        );
        if (dllPathMemoryAddr != NULL) {
            printf("step 3: write to the process memory\n");
            BOOL succeededWriting = WriteProcessMemory(
                hProcess, 
                dllPathMemoryAddr,  
                dllpath, 
                strlen(dllpath), 
                NULL 
            );

            if (succeededWriting) {
                printf("step 4: execute.\n");
                FARPROC loadLibAddr = GetProcAddress(
                    GetModuleHandle(TEXT("kernel32.dll")),
                    "LoadLibraryA" 
                );
                HANDLE rThread = CreateRemoteThread( 
                    hProcess, 
                    NULL, 
                    0, 
                     (LPTHREAD_START_ROUTINE)loadLibAddr,
                    dllPathMemoryAddr,
                    0,
                    NULL
                );
            }
        }
        CloseHandle(hProcess);
    }
    return TRUE;
}

after running the injector I get this output:

#### Starting ####
step 1: attaching the target process memory
step 2: allocate the target memory process
step 3: write to the process memory
step 4: execute.

after that, I am still unable to see in process explorer the new DLL.

Answer 1

I found the problem. I compiled the DLL as 64 but accidentally compiled the DLL injector has complied as 32 bit.