How to use CString::Format like printf 2

[titanandrews]

Hello,
From reading the docs on the CString::Format() function, I was under the impression that I could use it just like printf. I want to be able to set the width of the field to 10, but this code prints out garbage for CString. The printf() function however works fine. Can someone please tell me what I am doing wrong?

CString tmp = "Hello";
tmp.Format("%10s",tmp);	
cout << tmp.GetBuffer(tmp.GetLength()) << endl; //Garbage
tmp.ReleaseBuffer();

printf(&quot;%10s&quot;,&quot;Hello&quot;);   //As expected

many thanks,

Barry

 

[palbano]

try this and if you have any questions afterward i'll try to answer them.

CString tmp("hello"), out;
out.Format("%10s", (LPCTSTR)tmp);
cout << (LPCTSTR)out << endl; //works huh? why?

-pete

 

[ArkM]

MSDN CString::Format description ("From reading the docs on...&quot:
...
The call will fail if the string object itself is offered as a parameter to Format. For example, the following code:

CString str = "Some Data";
str.Format("%s%d", str, 123); // Attention: str is also used in the parameter list.

will cause unpredictable results.
...
Substitute str=>tmp - WYSIWYG?..

 

[palbano]

ArkM,

Oh you dirty rat... you spoiled my fun!

-pete