how to use a variable in parameters

Question

i need to know how to use a variable in parameters PROCESS is initalized as string PROCESS in the class parameters.

Process::GetProcessesByName("")

which gives me an error when i replace the string with a variable

Process::GetProcessesByName(PROCESS)

The error i get back is: No instance of overloaded function "System::Diagnostics::Process::GetProcessByName" Matches the argument list argument types are (std::string)

Is this C++ for .NET? Is Process a std::string or a System::String? — luiscubal, Oct 07 '13 at 18:52
for each (Process^ process in Process::GetProcessesByName(PROCESS)){ — , Oct 07 '13 at 18:55
yes o am doing it with CLI which i didnt think made much of a difference? and i looked up the getprocessbyname public: static array^ GetProcessesByName( String^ processName ) — , Oct 07 '13 at 19:03
So the datatype uses a handle ^ how can i make the variable a handle aswell? — , Oct 07 '13 at 19:03
http://msdn.microsoft.com/en-us/library/z3w4xdc9.aspx?cs-save-lang=1&cs-lang=cpp#code-snippet-1 — , Oct 07 '13 at 19:04
well i will look up later i only made it cli because i needed to include a dll for system diagnostics. any idea how to get the datatype as string^? — , Oct 07 '13 at 19:08

CS Pei · Accepted Answer · 2013-10-07T19:11:23.287

0

I think GetProcessesByName may take a parameter as LPSTR or char const *, but not a std::string,

try use

Process::GetProcessesByName(PROCESS.c_str());

or if your PROCESS is defined as std::string PROCESS;,

   String^ process_name = gcnew String(PROCESS.c_str());
   Process::GetProcessesByName(process_name);

edited Oct 07 '13 at 19:11

answered Oct 07 '13 at 18:53

CS Pei

10,869
1
27
46

"System::Diagnostics::Process::GetProcessByName" Matches the argument list argument types are (const char *) – Oct 07 '13 at 18:54
If it needs a `char const *`, then `std::string::c_str()` should work. – CS Pei Oct 07 '13 at 18:56
Try `Process::GetProcessesByName(PROCESS.c_str());` . If it does not work, what's error message? – CS Pei Oct 07 '13 at 19:01
the error is "System::Diagnostics::Process::GetProcessByName" Matches the argument list argument types are (const char *) – Oct 07 '13 at 19:06
The paramater takes datatype of string^ according to msdn http://msdn.microsoft.com/en-us/library/z3w4xdc9.aspx?cs-save-lang=1&cs-lang=cpp#code-snippet-1 – Oct 07 '13 at 19:07
@RichardGrant You seem to be lacking in absolute basics. You should consider following a beginners' tutorial or a [good book](http://stackoverflow.com/questions/388242/the-definitive-c-book-guide-and-list). – Angew is no longer proud of SO Oct 07 '13 at 19:07
If i am lacking in absolute basics then you should be able to answer the question rather then being pompous. – Oct 07 '13 at 19:09
1

to get a `System::String^` from `std::string`, try `string str = "test"; String^ str2 = gcnew String(str.c_str());` – CS Pei Oct 07 '13 at 19:09
I think your on the right track but its giving me an error system::String str2^ expression must have a class type – Oct 07 '13 at 19:18
@RichardGrant Sorry, I didn't mean to sound offensive (or pompous). But I do believe that at basic level, a good tutorial or book provides better learning material than separate questions about individual problems. – Angew is no longer proud of SO Oct 07 '13 at 19:34

how to use a variable in parameters

1 Answers1