CreateProcessW not honoring commandline [duplicate] - c++

Question

This question already has answers here:
CreateProcess doesn't pass command line arguments
(8 answers)
Closed 8 years ago.
I am trying to implement CreateProcessW within a dll so that the user can launch an application in a separate process.
For starters I am hardcoding the commands in the code until I figure it out..
I've got
STARTUPINFO si = {sizeof(STARTUPINFO), 0};
si.cb = sizeof(si);
PROCESS_INFORMATION pi = {0};
LPCTSTR AppName=L"c:\\utilities\\depends.exe";
LPTSTR Command = L"c:\\utilities\\tee.exe";
if (CreateProcessW(AppName, Command, 0, 0, 0, CREATE_DEFAULT_ERROR_MODE, 0, 0, &si, &pi)) {
CloseHandle(pi.hThread);
CloseHandle(pi.hProcess);
return GX_RESULT_OK;
} else {
.. show error msg
}
This will launch Depends but won't open Tee.exe. There's no error, it just ignores the command line parameter. The parameters are correct and I can run it at the run prompt and it works fine. If I leave AppName blank and specify Depends.exe as the Command parameter it also works, but if I specify
LPTSTR Command = L"c:\\utilities\\depends.exe c:\\utilities\\tee.exe";
I get Error 3: "The system cannot find the path specified".
Also, by specifying the lpCurrentDirectory parameter it is likewise ignored.

Answer 1

You must to supply the executable in the command
Appname should contain the full path to the executable
Command should contain also the argv[0]
if you want to open file t.txt with notepad than you can give as follows:
Appname = "c:/windows/notepad.exe";
command = "notepad c:/temp/t.txt";
You doesn't even must to supply the real program name, even fake name will do the job, since it is only a place holder.
like this: command = "fake c:/temp/t.txt";
now in notepad.exe:
argv[0] = "notepad";
argv[1] = "c:/temp/t.txt";
See this full example:
#include <Windows.h>
#include <iostream>
using namespace std;
int main(){
STARTUPINFO si = {sizeof(STARTUPINFO), 0};
si.cb = sizeof(si);
PROCESS_INFORMATION pi = {0};
LPTSTR AppName=L"C:/Windows/notepad.exe";
wchar_t Command[] = L"notepad C:/Temp/t.txt";
DWORD res = CreateProcess(AppName, Command, 0, 0, 0, CREATE_DEFAULT_ERROR_MODE, 0, 0, &si, &pi);
if (res) {
CloseHandle(pi.hThread);
CloseHandle(pi.hProcess);
return 0;
} else {
cerr<<"error..."<<GetLastError()<<endl;
};
return 0;
}