Getting Path of the executable in current folder C++ - c++

Question

I am trying get path of the exe file at the same folder where this program will been. but i couldnt figure out how to do, i did something like this but it only gets the current programs path, and i dont know how to replace filenames between my program and the program i want to get path.
so simply can you help me about get the path of an exe (i know the name of that exe ) at the same folder where this program will been...
char fullp[MAX_PATH];
char selfp[MAX_PATH] = "..//myprogram.exe";
char otherprogram[MAX_PATH] = "//test.exe";
DWORD szPath;
szPath = GetModuleFileName(NULL, selfp, sizeof(selfp));

Answer 1

The Win32 API has a whole bunch of Path Handling functions available.
For instance, once you have obtained the calling process's full path from GetModuleFileName(), you can use PathRemoveFileSpec() to remove the filename leaving just the folder path:
char selfdir[MAX_PATH] = {0};
GetModuleFileNameA(NULL, selfdir, MAX_PATH);
PathRemoveFileSpecA(selfdir);
And then use either PathAppend() or PathCombine() to append a different filename to that path:
char otherprogram[MAX_PATH] = {0};
lstrcpyA(otherprogram, selfdir);
PathAppendA(otherprogram, "test.exe");
char otherprogram[MAX_PATH] = {0};
PathCombineA(otherprogram, selfdir, "test.exe");

Answer 2

OP is most of the way there. Here is an example of how to get the rest of the way.
To simplify the solution, I'm leaving char arrays as far behind as possible and using std::string.
#include <iostream>
#include <string>
#include <windows.h>
int main()
{
char selfp[MAX_PATH];
std::string otherprogram = "Failed to get path";
DWORD szPath;
szPath = GetModuleFileName(NULL, selfp, MAX_PATH);
if (szPath != 0) // successfully got path of current program
{
// helper string to make life much, much easier
std::string helper = selfp;
//find last backslash in current program path
size_t pos = helper.find_last_of( "\\" );
if (pos != std::string::npos) // found last backslash
{
// remove everything after last backslash. This should remove
// the current program's name.
otherprogram = helper.substr( 0, pos+1);
// append new program name
otherprogram += "test.exe";
}
}
std::cout << otherprogram << std::endl;
}