Need help counting occurences of a letter from a file

Need help, been stuck on this the past couple days i dont really understand how to get my code to read from my file and count each occurence of a letter wheter they are uppr or lower case and output them to a file, just need help with the counting part, have to do it all through a function.

Here is my source code:

#include <iostream>
#include <fstream>
#include <iomanip>
using namespace std;
void getData(ifstream& inPara, ofstream& outChara, char texT[], int numLet[]);

int main()
{
    ifstream inFile;
    ofstream outFile;
    char ch[26] = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'};
    int numofCharacters[26] = {0};
    char target;

    inFile.open("Lab7.txt");//opens input file

    if (!inFile)//runs error if inFile could not be opened
    {
        cout << "Error unable to open Input File" << endl;
        cout << "Program Terminated!" << endl;
        return 1;
    }

    outFile.open("Output.txt");//opens Output File

    if (!outFile)//runs error if Output File could not be opened
    {
        cout << "Error unable to open Output File" << endl;
        cout << "Program Terminated!" << endl;
        return 1;
    }
    while (!inFile.eof())//runs program untile end of file
    {
        inFile >> target
    }

    inFile.close();
    outFile.close();

    return 0;
}

void getData(ifstream& inPara, ofstream& outChara, char texT[], int numLet[])
{

    for (int i = 0; i < 26; i++) {
    if (texT[i]) {
        numLet[i]++;
        }
    }
    for (int i = 0; i < 26; i++) {
        cout << numLet[i] << " " << endl;
    }
}