How to convert DWORD to char *?

Question

I am trying something like this,

PROCESS_INFORMATION processInfo = .....
strcat( args, processInfo.dwProcessId);

where args is a char * which I need to pass as an argument to another executable.

A `DWORD` is an integer type. It doesn't make any sense to convert it to a `char*`. — Cody Gray, Feb 14 '12 at 06:01
But I need this `DWORD` to be passed as an argument to another exe called using CreateProcess(). Any suggestions? — psp, Feb 14 '12 at 06:04
possible duplicate of [C++ long to string](http://stackoverflow.com/questions/947621/c-long-to-string) or [How to convert an int to string in C](http://stackoverflow.com/questions/8257714/how-to-convert-an-int-to-string-in-c). — user7116, Feb 14 '12 at 06:04

score 11 · Accepted Answer · edited Dec 11 '14 at 16:26

11

You can use sprintf

char procID[10];
sprintf(procID, "%d", processInfo.dwProcessId);

This will convert the processInfo.dwProcessId into a character which can then be used by you.

edited Dec 11 '14 at 16:26

spex

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answered Feb 14 '12 at 06:07

Ajit Vaze

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Among all possible options, I think this is the optimized one. – psp Feb 14 '12 at 06:22
Should probably use `%u` as `DWORD` is an unsigned integer. – user7116 Feb 14 '12 at 15:11
9

Actually, `DWORD` is an `unsigned long`, and you should use `%lu` as the format specifier. – tomlogic Mar 22 '12 at 19:56

score 3 · Answer 2 · answered Feb 14 '12 at 06:06

3

To convert DWORD to char * you can use _ultoa / _ultoa_s

see here might help you.link1

answered Feb 14 '12 at 06:06

Java

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score 2 · Answer 3 · answered Feb 14 '12 at 06:08

2

MSDN has pretty good documentation, check out the Data Conversion page.

There's sprintf() too.

answered Feb 14 '12 at 06:08

Alexey Frunze

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score 1 · Answer 4 · answered Feb 14 '12 at 06:05

While not directly "converting to a char*", the following should do the trick:

std::ostringstream stream;
stream << processInfo.dwProcessId;
std::string args = stream.str();

// Then, if you need a 'const char*' to pass to another Win32
// API call, you can access the data using:
const char * foo = args.c_str();

How to convert DWORD to char *?

4 Answers4