FileTest.cpp

#include<iostream>
#include<fstream>
#include<cstring>
#include<stdlib.h>
#include<unistd.h>
#include <sstream>


using namespace std;

typedef struct _FileBuffer
{
	void* data;			  
	long long data_len;
    int id;
    int* intPointer;          
}FileBuffer;

typedef struct _TestStruct
{
	void* data;			           
}TestStruct;

FileBuffer* getFileBuffer(const char* path);
TestStruct* getTestStruct(const char* path);

int main() {

    const char* value = "testetst";
    const char* path = "/c++/hik_obj/data/data-down.txt";
    FILE* downloadFile = fopen(path, "wb+");
    fwrite(value, sizeof(char), strlen(value), downloadFile);
    fclose(downloadFile);


    char * buffer;
    long size;
    ifstream file(path, ios::in|ios::binary|ios::ate);
    size = file.tellg();
    file.seekg(0, ios::beg);
    buffer = new char[size];
    file.read(buffer, size);
    void* buffer_void = file.rdbuf(); 
    // char* newBuffer = new char[size];
    // memcpy(newBuffer, buffer_void, size);
    // cout << "Buffer : " << (char *)buffer_void << endl; 

    cout << "Old Buffer:" << endl;
    FileBuffer* oldBuffer;
    cout << "Buffer is : " << oldBuffer << endl;
    cout << "Buffer size address:" << &oldBuffer->data_len <<  endl;
    cout << "Buffer size:" << oldBuffer->data_len <<  endl;
    cout << "Buffer data address:" << &oldBuffer->data << endl;
    cout << "Buffer data :" << oldBuffer->data << endl;
    cout << "Buffer id address:" << &oldBuffer->id << endl;
    cout << "Buffer id :" << oldBuffer->id << endl;
    cout << "Buffer int pointer address:" << &oldBuffer->intPointer << endl;
    cout << "Buffer int pointer:" << oldBuffer->intPointer << endl;
    // cout << "Buffer int pointer value:" << *oldBuffer->intPointer << endl;
    cout << "***************************************************************" << endl;

    cout << "new Buffer:" << endl;
    oldBuffer = new FileBuffer;
    cout << "Buffer is : " << oldBuffer << endl;
    cout << "Buffer size address:" << &oldBuffer->data_len <<  endl;
    cout << "Buffer size:" << oldBuffer->data_len <<  endl;
    cout << "Buffer data address:" << &oldBuffer->data << endl;
    cout << "Buffer data :" << oldBuffer->data << endl;
    cout << "Buffer id address:" << &oldBuffer->id << endl;
    cout << "Buffer id :" << oldBuffer->id << endl;
    cout << "Buffer int pointer address:" << &oldBuffer->intPointer << endl;
    cout << "Buffer int pointer:" << oldBuffer->intPointer << endl;
    // cout << "Buffer int pointer value:" << *oldBuffer->intPointer << endl;
    cout << "***************************************************************" << endl;

    cout << "allocate Buffer:" << endl;
    oldBuffer->data = new char[100];
    memcpy(oldBuffer->data, "testets", sizeof("testets"));
    char* str_pointer = (char *) oldBuffer->data;
    oldBuffer->intPointer = new int(10);
    oldBuffer->id = 11;
    oldBuffer->data_len = 9999;
    cout << "Buffer is : " << oldBuffer << endl;
    cout << "Buffer size address:" << &oldBuffer->data_len <<  endl;
    cout << "Buffer size:" << oldBuffer->data_len <<  endl;
    cout << "Buffer data address:" << &oldBuffer->data << endl;
    cout << "Buffer data :" << oldBuffer->data << endl;
    cout << "Buffer data value:" << str_pointer << endl;
    cout << "Buffer id address:" << &oldBuffer->id << endl;
    cout << "Buffer id :" << oldBuffer->id << endl;
    cout << "Buffer int pointer address:" << &oldBuffer->intPointer << endl;
    cout << "Buffer int pointer:" << oldBuffer->intPointer << endl;
    cout << "Buffer int pointer value:" << *oldBuffer->intPointer << endl;
    cout << "***************************************************************" << endl;

    delete oldBuffer->data;
    delete oldBuffer->intPointer;
    delete oldBuffer;
    cout << "Delete Buffer:" << endl;
    cout << "Buffer is : " << oldBuffer << endl;
    cout << "Buffer size address:" << &oldBuffer->data_len <<  endl;
    cout << "Buffer size:" << oldBuffer->data_len <<  endl;
    cout << "Buffer data address:" << &oldBuffer->data << endl;
    cout << "Buffer data :" << oldBuffer->data << endl;
    cout << "Buffer data value:" << str_pointer << endl;
    cout << "Buffer id address:" << &oldBuffer->id << endl;
    cout << "Buffer id :" << oldBuffer->id << endl;
    cout << "Buffer int pointer address:" << &oldBuffer->intPointer << endl;
    cout << "Buffer int pointer:" << oldBuffer->intPointer << endl;
    cout << "Buffer int pointer value:" << *oldBuffer->intPointer << endl;
    cout << "***************************************************************" << endl;


    // cout << "File Buffer:" << endl;
    // FileBuffer* fileBuffer = getFileBuffer("/c++/hik_obj/data/testdata-down.txt");
    // cout << "Buffer is : " << fileBuffer << endl;
    // cout << "Buffer size address:" << &fileBuffer->data_len <<  endl;
    // cout << "Buffer size:" << fileBuffer->data_len <<  endl;
    // cout << "Buffer data address:" << fileBuffer->data << endl;
    // cout << "***************************************************************" << endl;
    // cout << "Delete Buffer:" << endl;
    // delete fileBuffer;
    // cout << "Buffer is : " << fileBuffer << endl;
    // cout << "Buffer size address:" << &fileBuffer->data_len <<  endl;
    // cout << "Buffer size:" << fileBuffer->data_len <<  endl;
    // cout << "Buffer data address:" << fileBuffer->data << endl;
    // cout << "Buffer is null ? " << !fileBuffer << endl;

    // TestStruct* testStruct = getTestStruct("/c++/hik_obj/data/data.txt");
    // cout << "TestStruct is : " << testStruct << endl;
    // cout << "TestStruct data:" << testStruct->data << endl;
    // delete testStruct;
    // cout << "TestStruct is : " << testStruct << endl;
    // cout << "TestStruct data:" << testStruct->data << endl;
    // cout << "TestStruct is null ? " << !testStruct << endl;
    return 0;
}

FileBuffer* getFileBuffer(const char* path) {
    FileBuffer* fileBuffer = new FileBuffer;
    ifstream file(path, ios::in|ios::binary|ios::ate);
    fileBuffer->data_len = file.tellg();
    file.seekg(0, ios::beg);
    fileBuffer->data = file.rdbuf();
    file.close();
    return fileBuffer;
}

TestStruct* getTestStruct(const char* path) {
    TestStruct* testStruct = new TestStruct;
    ifstream file(path, ios::in|ios::binary|ios::ate);
    file.seekg(0, ios::beg);
    testStruct->data = file.rdbuf();
    file.close();
    return testStruct;
}