Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

Best way to convert a CString to LPSTR

Posted on 2003-11-02
7
Medium Priority
?
2,172 Views
Last Modified: 2010-05-18
I have a Treeview control where I am adding a hierarchy of text items.
To insert items I use the TV_INSERTSTRUCT and the TreeCtrlItem.item.pszText to set text.
Since item.pszText needs a LPSTR I can either set it without using a variable, like 'TreeCtrlItem.item.pszText = "testItem";' but if I want to use a CString I have to convert that CString to LPSTR before using it.
What is the best way to do this?

I am currently using:
CString testString = "Cardboard";
int length = testString .GetLength();
char *cptr = testString .GetBuffer(length);
TreeCtrlItem.item.pszText = cptr;

Any other better ways?
0
Comment
Question by:Trickster
7 Comments
 
LVL 86

Expert Comment

by:jkr
ID: 9666915
Why not using

CString testString = "Cardboard";
TreeCtrlItem.item.pszText = (LPCTSTR) testString;

?

0
 

Author Comment

by:Trickster
ID: 9667021
I tried that but got the message that TreeCtrlItem.item.pszText won't accept a LPCTSTR string - only LPSTR. I read in the help files that I can convert from LPCTSTR to LPSTR but that would mean two different conversions/casts and I don't know if that is a good choice.. That's one of the reasons I asked this question here.. :-)

// T
0
 
LVL 19

Assisted Solution

by:Dexstar
Dexstar earned 400 total points
ID: 9667070
Trickster:

> Since item.pszText needs a LPSTR I can either set it without using a variable,
> like 'TreeCtrlItem.item.pszText = "testItem";' but if I want to use a CString
> I have to convert that CString to LPSTR before using it. What is the best way
> to do this?

Try this:
     CString testString = "Cardboard";
     TreeCtrlItem.item.pszText = testString.GetBuffer();

     // Do something with the struct

Then do this:
     testString.ReleaseBuffer();

Hope that helps,
Dex*
0
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 3

Accepted Solution

by:
freewell earned 400 total points
ID: 9669082
t is alright to do the multiple castings. The first casting is to get the internal String character buffer pointer and the second casting is just to please the compiler.

TreeCtrlItem.item.pszText = (LPTSTR)(LPCTSTR)testString;

The TreeCtrlItem.item.pszText is an input parameter and it should be declared as const. As you are see in the CTreeCtrl::InsertItem(UNIT nMask, LPCTSTR lpszItem, ...).

There is inconsistency of the CONST-ness of the ealier Microsoft API.
0
 

Expert Comment

by:jbuote1
ID: 9674083
Why not something as simple as:

strcpy((char*)TreeCtrlItem.item.pszText , (LPCSTR)testString);

Obviously casting the TreeCtrlItem... to whatever it is...
char, wchar, tchar  so on....
0
 

Expert Comment

by:jbuote1
ID: 9674088
Rather cast testString to LPCTSTR as previously noted...
Both seem to work.
0
 

Author Comment

by:Trickster
ID: 9678127
Both Dextar and Freewell came up with a good answer so I doubled the points and then split them between the two..

// Trickster
0

Featured Post

Hire Technology Freelancers with Gigs

Work with freelancers specializing in everything from database administration to programming, who have proven themselves as experts in their field. Hire the best, collaborate easily, pay securely, and get projects done right.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Often, when implementing a feature, you won't know how certain events should be handled at the point where they occur and you'd rather defer to the user of your function or class. For example, a XML parser will extract a tag from the source code, wh…
This article shows you how to optimize memory allocations in C++ using placement new. Applicable especially to usecases dealing with creation of large number of objects. A brief on problem: Lets take example problem for simplicity: - I have a G…
The goal of the video will be to teach the user the concept of local variables and scope. An example of a locally defined variable will be given as well as an explanation of what scope is in C++. The local variable and concept of scope will be relat…
The goal of the video will be to teach the user the difference and consequence of passing data by value vs passing data by reference in C++. An example of passing data by value as well as an example of passing data by reference will be be given. Bot…
Suggested Courses

885 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question