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Check for empty path in TryLoadCustomDSM.

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This commit is contained in:
Eugene Wang 2025-03-05 08:54:45 -05:00
parent 6b35b1735d
commit 5c15ec3711
2 changed files with 44 additions and 32 deletions
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2
src/Directory.Build.props
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@ -2,7 +2,7 @@
<PropertyGroup> <PropertyGroup>
<!--change these in each release--> <!--change these in each release-->
<VersionPrefix>4.0.0.0</VersionPrefix> <VersionPrefix>4.0.0.0</VersionPrefix>
<VersionSuffix>alpha.8</VersionSuffix> <VersionSuffix>alpha.9</VersionSuffix>
<!--keep it the same until major # changes--> <!--keep it the same until major # changes-->
<AssemblyVersion>4.0.0.0</AssemblyVersion> <AssemblyVersion>4.0.0.0</AssemblyVersion>

74
src/NTwain/DSM/DsmLoader.cs
View File

@ -11,40 +11,52 @@ using System.Threading.Tasks;
namespace NTwain.DSM namespace NTwain.DSM
{ {
/// <summary> /// <summary>
/// For demoing loading dsm from custom path in case /// For demoing loading dsm from custom path in case
/// it's not installed on system and don't want to be /// it's not installed on system and don't want to be
/// placed besides the exe. /// placed besides the exe.
/// </summary> /// </summary>
static class DsmLoader static class DsmLoader
{
static IntPtr __dllPtr;
public static bool TryLoadCustomDSM()
{ {
if (__dllPtr == IntPtr.Zero) static IntPtr __dllPtr;
{
var curFile = Assembly.GetExecutingAssembly().Location;
var dll = Path.Combine( public static bool TryLoadCustomDSM()
Path.GetDirectoryName(curFile)!,
$@"runtimes\win-{(TWPlatform.Is32bit ? "x86" : "x64")}\native\TWAINDSM.dll");
__dllPtr = LoadLibraryW(dll);
if (__dllPtr != IntPtr.Zero)
{ {
Debug.WriteLine("Using our own dsm now :)"); if (__dllPtr == IntPtr.Zero)
{
#if NETFRAMEWORK
var curFile = Assembly.GetExecutingAssembly().Location;
if (string.IsNullOrEmpty(curFile))
{
using var proc = Process.GetCurrentProcess();
curFile = proc.MainModule.FileName;
}
var folder = Path.GetDirectoryName(curFile);
#else
var folder = AppContext.BaseDirectory;
#endif
if (!string.IsNullOrEmpty(folder))
{
var dll = Path.Combine(
folder,
$@"runtimes\win-{(TWPlatform.Is32bit ? "x86" : "x64")}\native\TWAINDSM.dll");
__dllPtr = LoadLibraryW(dll);
}
if (__dllPtr != IntPtr.Zero)
{
Debug.WriteLine("Using our own dsm now :)");
}
else
{
Debug.WriteLine("Will attempt to use default dsm :(");
}
}
return __dllPtr != IntPtr.Zero;
} }
else
{ [DllImport("kernel32", SetLastError = true)]
Debug.WriteLine("Will attempt to use default dsm :("); static extern IntPtr LoadLibraryW([MarshalAs(UnmanagedType.LPWStr)] string lpFileName);
}
}
return __dllPtr != IntPtr.Zero;
} }
[DllImport("kernel32", SetLastError = true)]
static extern IntPtr LoadLibraryW([MarshalAs(UnmanagedType.LPWStr)] string lpFileName);
}
} }