Solved

incompatible types, String and PChar

Posted on 1997-10-08
2
1,011 Views
Last Modified: 2008-03-06
hi,

When trying to find the Windows dir I use this,

Var
WinDirLen: Integer;
WinDir: PChar;
dir : string;
Begin
GetMem(WinDir, 255);
WinDirLen := GetSystemDirectory(WinDir,255);
dir := Windir;
FreeMem(WinDir);
end;

And I have this in my FormCreate;

Image1.Picture.Bitmap.Handle:= NViewLibLoad('c:\Program Files\Empire\800x600.jpg',false);

if I use this

Image1.Picture.Bitmap.Handle:= NViewLibLoad(dir + '800x600.jpg',false);
I get incompatible types String and PChar;

Please show me how it will work.

this is in the var that follows before implementation.
function NViewLibLoad(FileName : PChar; ShowProgress: BooLean):hbitmap; Stdcall; external 'NViewLib.dll';
0
Comment
Question by:hellfire052497
  • 2
2 Comments
 
LVL 3

Accepted Solution

by:
mirek071497 earned 50 total points
ID: 1347070
I think so you need to know how the conversion between strings can be done.

in many ways.

Image1.Picture.Bitmap.Handle:= NViewLibLoad( PChar( string(dir) + '800x600.jpg' ),false);

when s is type PChar then String(s) give you long string.
when s is Long String then PChar(s) give you type PChar.

so in your problem string(dir) give you long string
PChar(      string(dir)+'800x600.jpg'   ) give you PChar.
0
 
LVL 3

Expert Comment

by:mirek071497
ID: 1347071
Hi

sorry i just see so dir is string no pchar. Then you can use use this without string(dir) :

Image1.Picture.Bitmap.Handle:= NViewLibLoad( PChar( dir + '800x600.jpg' ),false);

0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
proper way to parse text with delphi 7 101
Delphi: how to send PJL commands to printer 3 90
Reconfigure Delphi Install? 2 47
JAudiorecorder record freezing the app 29 60
Creating an auto free TStringList The TStringList is a basic and frequently used object in Delphi. On many occasions, you may want to create a temporary list, process some items in the list and be done with the list. In such cases, you have to…
Hello everybody This Article will show you how to validate number with TEdit control, What's the TEdit control? TEdit is a standard Windows edit control on a form, it allows to user to write, read and copy/paste single line of text. Usua…
This Micro Tutorial hows how you can integrate  Mac OSX to a Windows Active Directory Domain. Apple has made it easy to allow users to bind their macs to a windows domain with relative ease. The following video show how to bind OSX Mavericks to …
In this video I am going to show you how to back up and restore Office 365 mailboxes using CodeTwo Backup for Office 365. Learn more about the tool used in this video here: http://www.codetwo.com/backup-for-office-365/ (http://www.codetwo.com/ba…

863 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

Need Help in Real-Time?

Connect with top rated Experts

22 Experts available now in Live!

Get 1:1 Help Now