=20 int WINAPI WinMain (HINSTANCE hInstance, =20 HINSTANCE hPrevInstance, LPSTR lpszCmdLine, int cmdShow =20 ) { if (SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, "c:\\screen.bmp", = SPIF_UPDATEINIFILE)) printf("Success\n"); else printf("Error:%lu\n",GetLastError()); } =20 I compiled it with gcc test.c -luser32 -lgdi32 -o test.exe =20 When I execute ./test.exe at the bash prompt the output is =20 Error:0 I tried to use the same SystemParametersInfo call in a program built = with Visual C++ and it worked properly. I also tried to use SystemParametersInfo to retrieve the size of the = desktop not covered by the system tray (using the SPI_GETWORKAREA = argument) and it woked with Visual C++ and Cygnus both. =20 I hope somebody could help me. =20 Thanks =20 Alessandro Staltari ------=_NextPart_000_00A6_01BDFEB8.1EDD5060 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hello!

I'm Alessandro Staltari and I have a = little big=20 problem with Cygnus Win32 C/C++ environment(release B19 with patched=20 cygwinb19.dll).

I'm tryng to port the nice X-windows = program=20 xearth (http://www.cs= ..colorado.edu/~tuna/xearth/index.html)=20 to windows, and I thougth to use the SystemParametersInfo function to = update the=20 desktop wallpaper.

The probelm is that when I try to = update the=20 wallpaper nothing happen to the desktop configuration, = SystemParametersInfo=20 returns 0 (failure) ad GetLastError returns 0 (No error). = Why?

To test the SystemParametersInfo = function I used=20 the following simple program:

#include = <windows.h>

int WINAPI WinMain (HINSTANCE = hInstance, =20
    HINSTANCE hPrevInstance,
   =20 LPSTR   lpszCmdLine,
    = int    =20 cmdShow
   )
{
if=20 (SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, = "c:\\screen.bmp",=20 SPIF_UPDATEINIFILE))
= printf("Success\n");
else=20 printf("Error:%lu\n",GetLastError());
}

I compiled it with

gcc test.c -luser32 -lgdi32 -o=20 test.exe

When I execute ./test.exe at the bash prompt the = output=20 is

Error:0

I tried to use the same = SystemParametersInfo=20 call in a program built with Visual C++ and it worked = properly.

I also tried = to use=20 SystemParametersInfo to retrieve the size of the desktop not covered by = the=20 system tray (using the SPI_GETWORKAREA argument) and it woked with = Visual C++=20 and Cygnus both.

I hope somebody could help = me.

Thanks

Alessandro = Staltari

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