Getting SetLayeredWindowAttributes Working

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September 12th, 2004, 11:00 PM

DllFreak112

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Location: FL

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Getting SetLayeredWindowAttributes Working

I can't get the "SetLayeredWindowAttributes" API working in visual c++ 6.

When i compile it says:
"error C2065: 'SetLayeredWindowAttributes' : undeclared identifier".

My Code:

Code:

#include <windows.h>
#include <Winuser.h>
#define export extern "C" __declspec (dllexport)
#pragma comment(lib,"User32.lib")
 
export double Transparent (double hwnd,double alpha,double key)
{
DWORD flags;
return (double)(DWORD)SetLayeredWindowAttributes(hwnd,key  ,Alpha,&flags);
}

Can anyone help me get it working without buying vc++ 7?

July 20th, 2005, 12:23 AM

Fred77

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Join Date: Jul 2005

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'SetLayeredWindowAttributes' only available under Win2000 abd later

Hi,
if the problem is not solved already: Since this API is not available under earlier Windows Systems, you must tell the compiler somewhere, that it shall compile specifically for Win 2000 and later. This works by putting:
#define WINVER 0x0500
BEFORE the include of the windows headers, or as a project setting.
By the way: I came over this while searching for a solution of a performance problem with this API - display of a layered window takes about 2s on an older notebook. Anyone knows this problem and possibly how to speed up display of layered windows?

Quote:

Originally Posted by DllFreak112

I can't get the "SetLayeredWindowAttributes" API working in visual c++ 6.

When i compile it says:
"error C2065: 'SetLayeredWindowAttributes' : undeclared identifier".

My Code:

Code:

#include <windows.h>
#include <Winuser.h>
#define export extern "C" __declspec (dllexport)
#pragma comment(lib,"User32.lib")
 
export double Transparent (double hwnd,double alpha,double key)
{
DWORD flags;
return (double)(DWORD)SetLayeredWindowAttributes(hwnd,key  ,Alpha,&flags);
}

Can anyone help me get it working without buying vc++ 7?

July 20th, 2005, 12:56 AM

B-Con

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We appreciate your willingness to contribute to the forums, but what do you think the odds are of that guy still being here 1 year later having logged only that post?

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