Modifying app.config through installscript

Question

Hello all,

How to modify app.config files through installscript in installshield 2010. I want to modify the sql connection string in app.config file based on user selected server. Early help should be appreciated.

Answer 1

I have written own installscript to change the connection string.

Code snippet :

function Update_AppConfig(hMSI) STRING EXAMPLE_FILE, EXAMPLE_DIR; STRING svLine; STRING svContent; number nvBuff,temp,nvFileHandle ; string szConnection,szServer,szFileName,szUser,szFilePath; long cchValueBuf; long length;
begin

EXAMPLE_FILE = "Example.exe.config"; EXAMPLE_DIR = INSTALLDIR;

cchValueBuf = 2;

MsiGetProperty(hMSI,"IS_SQLSERVER_SERVER",szServer,cchValueBuf);

OpenFileMode (FILE_MODE_NORMAL);

if (OpenFile (nvFileHandle, EXAMPLE_DIR, EXAMPLE_FILE) < 0) then
MessageBox ("OpenFile failed.", SEVERE);
abort;
endif;

while GetLine (nvFileHandle, svLine) = 0 svContent = svContent + svLine + "\r\n"; endwhile;

 if (CloseFile (nvFileHandle) < 0) then           
    MessageBox ("CloseFile failed.", SEVERE);       
endif;   

StrReplace (svContent, "{{SQLSERVERSETTING}}", szServer, 0);

// Close the file.

OpenFileMode (FILE_MODE_BINARY);

if (OpenFile (nvFileHandle, EXAMPLE_DIR, EXAMPLE_FILE) < 0) then
MessageBox ("OpenFile failed.", SEVERE);
abort;
endif;

length = StrLength (svContent);

if (WriteBytes (nvFileHandle, svContent, 0, length) < 0) then MessageBox ("WriteBytes failed.", SEVERE);
endif;

if (CloseFile (nvFileHandle) < 0) then MessageBox ("CloseFile failed.", SEVERE); endif;

end;