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How does a language expand itself? [closed]
... some of Qt 's capabilities to code GUI programs. I asked myself the following question:
15 Answers
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What is the argument for printf that formats a long?
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On most platforms, long and int are the same size (32 bits). Still, it does have its own format specifier:
long n;
unsigned long un;
printf("%ld", n); // signed
printf("%lu", un); // unsigned
For 64 bits, you'd want a long long:
long long n;
unsigned long long un;
printf("%l...
How do you run a crontab in Cygwin on Windows?
Some cygwin commands are .exe files, so you can run them with the standard Windows Scheduler, but others don't have an .exe extension so can't be run from DOS (it seems like).
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How do I show a Save As dialog in WPF?
...e WPF variant is quite a bit different and differing namespace.
Microsoft.Win32.SaveFileDialog dlg = new Microsoft.Win32.SaveFileDialog();
dlg.FileName = "Document"; // Default file name
dlg.DefaultExt = ".text"; // Default file extension
dlg.Filter = "Text documents (.txt)|*.txt"; // Filter files ...
Structure padding and packing
...ndaries - say, int members would have offsets, which are mod(4) == 0 on 32-bit platform. Padding is on by default. It inserts the following "gaps" into your first structure:
struct mystruct_A {
char a;
char gap_0[3]; /* inserted by compiler: for alignment of b */
int b;
char c;
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What's the difference between size_t and int in C++?
... as unsigned int, which can lead to programming errors, particularly as 64-bit architectures become more prevalent.
Also, check Why size_t matters
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How do you determine the size of a file in C?
...: %s\n",
filename, strerror(errno));
return -1;
}
On 32-bit systems you should compile this with the option -D_FILE_OFFSET_BITS=64, otherwise off_t will only hold values up to 2 GB. See the "Using LFS" section of Large File Support in Linux for details.
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Java Desktop application: SWT vs. Swing [closed]
...hing to consider is that some users and some resellers (Dell) install a 64 bit VM on their 64 bit Windows, and you can't use the same SWT library on 32 bit and 64 bit VMs.
This means you will need to distribute and test different packages depending on whether users have 32-bit or a 64-bit Java VM. ...
How to get the current directory in a C program?
... is tagged Unix, people also get to visit it when their target platform is Windows, and the answer for Windows is the GetCurrentDirectory() function:
DWORD WINAPI GetCurrentDirectory(
_In_ DWORD nBufferLength,
_Out_ LPTSTR lpBuffer
);
These answers apply to both C and C++ code.
Link sugges...
Xcode build failure “Undefined symbols for architecture x86_64”
... @BraveS : By removing arm64 architecture will it work for 64-bit device?
– Jayprakash Dubey
Jan 6 '15 at 10:06
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