4 replies to this topic

[vishnub]

Hi All,

I am using InstallScriptMsi project, in which i am using LaunchAppandWait to launch an application. In turn that application needs a dll to initiate. I am setting the dll's path in the Path(environment variable) after copying the file, which is followed by launching the application. But the value which i set to the environment variable is not reflected to the application. So the application failed to execute.

For that i pass the environment block to the LaunchAppandWait, as follows

szEnvPath = INSTALLDIR ^ "sample.dll";

LAAW_PARAMETERS.lpEnvironment = &szEnvPath;

Still the application can't able to get the path, what i did is correct, or any other solution to solve this problem.


Thanking you in Advance,

Gratefully,
Vishnu

[Stefan Krueger]

Shouldn't you prepend the path with "PATH=" ?

[vishnub]

This is the part of the script which i have used to laucnch the application. Here i got the existing value of the path and appended it with the szEnvPath also.

ENV_TEMP ="Path";

if (GetEnvVar (ENV_TEMP, svEnvVar) < 0) then
MessageBox ("Environment variable " + ENV_TEMP + " not found.", SEVERE);
endif;

svShared = INSTALLDIR ^ "sample.dll";

szEnvPath = "Path=" + svEnvVar + svShared + "\\0";

LAAW_PARAMETERS.lpEnvironment = &szEnvPath;

if(LaunchAppAndWait(szProgram,szCmdLine,LAAW_OPTION_NO_CHANGEDIRECTORY|LAAW_OPTION_WAIT )<0)then
MessageBox("Can't able to launch",0);
else
nResult = LAAW_PARAMETERS.nLaunchResult;
svError=FormatMessage(nResult);
if(nResult != 0)then
SprintfBox(INFORMATION,"Application Failed","%s",svError);
endif;
endif;


One more approach what i tried is, i set the PATH environment variable after copying files and broadcasted as follows

#define WM_WININICHANGE 0x001A
#define HWND_BROADCAST 0xffff

szEnv = "Environment";
pEnv = &szEnv;
SendMessage (HWND_BROADCAST, WM_WININICHANGE, 0, pEnv );

Even now the paths are not available at the time of launching the application. But after the installation, i can able to do it manually.

Let me know, if there is any mistake or give me an solution to solve this problem.


Gratefully,
Vishnu

[Stefan Krueger]

Try this:
szEnvPath = "PATH=" + svEnvVar + ";" svShared + "\\0";
// (not sure if case of PATH matters, but I think you need the semicolon)

Also you could try to converrt svShared to short path (~ form).

Can you call a simple test.exe that displays the value of PATH in a message box?

[vishnub]

I tried like the following,

szEnvPath = "PATH=" + svEnvVar + ";" + svShared + "\\0\\0\\0\\0";

According to this link,
http://msdn.microsof...eateprocess.asp

"A Unicode environment block is terminated by four zero bytes: two for the last string, two more to terminate the block."


I added the following codes also, for the dwCreationFalgs parameter, i included CREATE_UNICODE_ENVIRONMENT and CREATE_NEW_CONSOLE flags also. I trying to launch an jar file, so i hope if i create new console it will reflect the changes in the PATH variable.

LAAW_PARAMETERS.lpEnvironment = &svEnvPath;
LAAW_PARAMETERS.dwCreationFlags = LAAW_PARAMETERS.dwCreationFlags | 0x00000400 | 0x00000010;

Still the problem is not solved.
Please, Check what i did is correct ?

Thanks,
Vishnu