Help with dllcall

[igorm]

Hi,

I'm trying to use this with DLLCall, but I can't get it work. Can anybody help me with this. Also, any other way of using this could help, it does not have to be DLLCall.

Cheers

[Richard Robertson]

You call functions with DllCall, not work with objects. What were you even trying? (code, I mean)

[igorm]

I'm trying to get DisplayName from .msp file. I sow something here so I thought that I can use the same thing.

[Richard Robertson]

That thread was about MSI (Windows installer) files. You are talking about "msp"? Was yours a typo or are you trying to do something completely different?

[igorm]

No, it's not a typo. ".msp" file is patch for MSI.

Cheers

[Richard Robertson]

Ah. I didn't know. It was just similar, and the p is close to the i key.

But still, I don't know that it is possible to load objects from dlls right now.

[igorm]

What about this function? Can it be somehow called with DLLCall?

Cheers

[Richard Robertson]

Yes, this function ought to be callable through DllCall. Do you need help setting it up or are you just asking?

[igorm]

Yes, I need help with setting it. Thanks in advance for any help.

Cheers

[Richard Robertson]

Well it shouldn't be too hard, you need 3 strings, a number, 2 more strings, and another number. Those are pretty simple data types. I don't know what parameters you are calling it with though, but to set it up:

Dim $dll = DllOpen("msi.dll") ; you may need the full path
$return = DllCall($dll, "uint", "MsiGetPatchInfoEx", "string", $PARAM_1, "string", $PARAM_2, "string", $PARAM_3, "int", $PARAM_4, "string", $PARAM_5, "string", $PARAM_6, "ulong*", $PARAM_7)

Just replace each of the $PARAM_ variables with what you actually want to call the function with.

[igorm]

Hi,

Thanks for help and I'm sorry for bothering you, but could you give me example. I never used DllCall so I have no idea how to start. I need to get "INSTALLPROPERTY_DISPLAYNAME". Also, where do I put path to file from which I want to read? Thanks again for you help.

Cheers

[Richard Robertson]

I don't know anything about the function or the MSI patch system. As for that value, go back to the page you had. I think it displays the numbers for the constants on it.

[d4rk]

Dim $dll = DllOpen("msi.dll") ; you may need the full path
$return = DllCall($dll, "uint", "MsiGetPatchInfoEx", "string", $PARAM_1, "string", $PARAM_2, "string", $PARAM_3, "int", $PARAM_4, "string", $PARAM_5, "string", $PARAM_6, "ulong*", $PARAM_7)

Hello, i'm also interesting in DLL, and i see you code by chance .... it would be greatful if you can explain about the "uint", how do you know this's the "return type" ?

Thanks you

[Richard Robertson]

UINT MsiGetPatchInfoEx(

__in LPCTSTR szPatchCode,

__in LPCTSTR szProductCode,

__in LPCTSTR szUserSid,

__in MSIINSTALLCONTEXT dwContext,

__in LPCTSTR szProperty,

__out_opt LPTSTR lpValue,

__inout DWORD *pcchValue

);

This is the function definition. The UINT is a #define for unsigned int. That's how I knew.

Edited June 10, 2008 by Richard Robertson

[d4rk]

Thanks