The type of expression ” quickscan.exe resolution 300 selectscanner jpg showui showprogress filename ‘”+name+”.jpg'” is std::string. However function system has declaration int system(const char *s); that is it accepts an argumnet of type const char * There is no conversion operator that would convert implicitly an object of type std::string to object of type const … Read more
You can use WinExec(“your cmd command”, SW_HIDE); instead of system(“cmd command”).
I believe you’ll find interesting this blog post: Tags: Database schemas The Problem: You want to have a database schema where you can tag a bookmark (or a blog post or whatever) with as many tags as you want. Later then, you want to run queries to constrain the bookmarks to a union or intersection … Read more
System.out is initialized to null when the class is instantiated. This is set by the nullPrintStream() method in System.java, which just returns null. When the JVM has initialized, it calls the initializeSystemClass() method. This method calls the native method setOut0() which sets the out variable to the appropriate value. This may seem weird but it … Read more
Best practices: avoid the shell, use automatic error handling – IPC::System::Simple. require IPC::System::Simple; use autodie qw(:all); system qw(command –arg1=arg1 –arg2=arg2 -arg3 -arg4); use IPC::System::Simple qw(runx); runx [0], qw(command –arg1=arg1 –arg2=arg2 -arg3 -arg4); # ↑ list of allowed EXIT_VALs, see documentation Edit: a rant follows. eugene y’s answer includes a link to the documentation to system. … Read more
system is a bad idea for several reasons: Your program is suspended until the command finishes. It runs the command through a shell, which means you have to worry about making sure the string you pass is safe for the shell to evaluate. If you try to run a backgrounded command with &, it ends … Read more
Cramer’s Rule and Gaussian Elimination are two good, general-purpose algorithms (also see Simultaneous Linear Equations). If you’re looking for code, check out GiNaC, Maxima, and SymbolicC++ (depending on your licensing requirements, of course). EDIT: I know you’re working in C land, but I also have to put in a good word for SymPy (a computer … Read more
Use the collapse argument to paste: paste(a,collapse=” “) [1] “aa bb cc”
We have two options. Look at Preferences->Locations->”Custom Paths” in Xcode’s preference. A path added here will be a variable which you can add to “Header Search Paths” in project build settings as “$cppheaders”, if you saved the custom path with that name. https://help.apple.com/xcode/mac/11.4/#/deva52afe8a4 Set HEADER_SEARCH_PATHS parameter in build settings on project info. I added “${SRCROOT}” … Read more
The changed directory only lasts for the duration of the system command. The command starts a separate program, which inherits its current directory from your program, but when that program exits its current directory dies with it. You can use && to join the commands together, and it will work: system(“cd /D C:\\Users\\USER\\Desktop && mkdir … Read more