I check the name of a pendrive with GetVolumeInformation.
The information is stored in "lpVolumeNameBuffer".
ok.

If the pendrive is not the one I want to use for backups I give out a messagebox.

Something like...
invoke MessageBoxA,NULL,err_message,err_caption,MB_ICONWARNING+MB_OKCANCEL

;GetVolume Params
lpVolumeNameBuffer dd ?,0
etc.

err_caption db 'ERROR MSG',0
err_message db 'Wrong Pendrive - Continue ??',0

Now the question:
How can I build a string which contains err_message AND lpVolumeNameBuffer.

Something like...

err_message db 'Wrong Pendrive ' + [lpVolumeNameBuffer]

Whatever possibility I try gives an error message from the compiler.
I use fasmw.exe

The only solution I find, is to write the var lpVolumeNameBuffer after var err_message and not to finish err_message with ,0

You can use the wsprintf API. Just remember that it is a C-Call convention function.

yes thanks, but I want to use the messagebox. And why does Bill G. say "Do not use" wsprintf ?

clamicun,

For simple string concatenation lstrcpy() / lstrcat() will suffice. wsprintf() can be used to construct more complex strings. Those functions have to be used carefully, they don't know output buffer size and easily can overflow it. FormatMessage() is safer in that sense.

Actually wsprintf limits the output to 1024 characters. This is not stated anywhere in the official docs. Although that limit is possibly different on other OS versions.

My problem continues...

How do I get the 2 vars (lpVolumeNameBuffer and/or lpOut from wsprintf) into the err_message ?

Example ?

clamicun,

That's easy: Aren't you familiar with printf() family?

I think you will need brackets around lpVolumeNameBuffer (i.e. [lpVolumeNameBuffer]) since it is defined as: lpVolumeNameBuffer dd ?

Definitely, mea culpa. I thought about static VolumeNameBuffer TCHAR MAX_PATH+1 dup ? but copy-pasted something slightly different.

YES, it works - without brackets. I understand the "%s" is lpVolumeNameBuffer.
Thank you guys a lot!
clamicun from Germany

Then I think your buffer is too small, only 4 bytes of storage. Be careful you are not overwriting something that is after the buffer. Also the 'lp' in front of the name is confusing since it usually stands for Long Pointer, and what you have is not a Long Pointer but is a buffer.

ok. I'll consider that.