function CheckRequirements() // 检测安装所需要的环境
NUMBER nvDx, nvDy, nvResult;
STRING svResult;
begin
bIsShellExplorer = FALSE;
bIsWindowsNT4 = FALSE;
bIsWindowsNT351 = FALSE;
bIsWindows95 = FALSE;
bIsWindows98 = FALSE;
// 测量屏幕分辨率,最小要求为640 x 480
GetExtents( nvDx, nvDy );
if (nvDy < 480) then
MessageBox( @ERROR_VGARESOLUTION, WARNING );
abort;
endif;
// 设置"安装"操作模式
bIs32BitSetup = TRUE;
GetSystemInfo( ISTYPE, nvResult, svResult ); // 获得操作系统的类型信息
if (nvResult = 16) then
bIs32BitSetup = FALSE;// 行16位安装程序
return 0;
endif;
// 检测目标操作系统
GetSystemInfo( OS, nvResult, svResult );
if (nvResult = IS_WINDOWSNT) then
// 判定操作系统是Windows NT 4.0还是Windows NT 3.51,
if (GetSystemInfo( WINMAJOR, nvResult, svResult ) = 0) then
if (nvResult >= 4) then
bIsShellExplorer = TRUE;
bIsWindowsNT4 = TRUE;
else
bIsWindowsNT351 = TRUE;
endif;
endif;
elseif (nvResult = IS_WINDOWS9X) then
bIsShellExplorer = TRUE;
// 判定操作系统是Windows 95还是Windows 98
GetSystemInfo (WINMINOR, nvResult, svResult);
if (nvResult < 10) then
bIsWindows95 = TRUE;
else
bIsWindows98 = TRUE;
endif;
endif;
end;