Fixed [WinError 1114] A dynamic link library (DLL) initialization routine failed, Potential fix for CUDA GPU is not available

CHANGELOG.md

@@ -1,3 +1,7 @@
+# 1.2.2 (pre-release)
+- Fixed `[WinError 1114] A dynamic link library (DLL) initialization routine failed` error on Windows, pre-loading PyTorch DLLs before initializing PyQt6 to avoid DLL initialization errors, mentioned in #98 by @ephr0n.
+- Potential fix for `CUDA GPU is not available` issue, by ensuring PyTorch is installed correctly with CUDA support on Windows using the installer script.
+
 # 1.2.1
 - Upgraded Abogen's interface from PyQt5 to PyQt6 for better compatibility and long-term support.
 - Added tooltip indicators in queue manager to display book handler options (`Save chapters separately` and `Merge chapters at the end`) for queued items.

README.md

@@ -42,7 +42,7 @@ python -m venv venv
 venv\Scripts\activate
 
 # For NVIDIA GPUs:
-pip install torch==2.8.0 torchaudio==2.8.0 torchvision==0.23.0 --index-url https://download.pytorch.org/whl/cu128
+pip install torch torchaudio torchvision --index-url https://download.pytorch.org/whl/cu128
 
 # For AMD GPUs:
 # Not supported yet, because ROCm is not available on Windows. Use Linux if you have AMD GPU.

WINDOWS_INSTALL.bat

@@ -279,8 +279,7 @@ if /I "%IS_NVIDIA%"=="true" (
 
     if "%cuda_available%"=="False" (
         echo Installing PyTorch with CUDA (12.8) support...
-        :: Temporarily set the PyTorch version to 2.0.8 to prevent [WinError 1114] error.
-        %PYTHON_CONSOLE_PATH% -m pip install torch==2.8.0 torchaudio==2.8.0 torchvision==0.23.0 --extra-index-url https://download.pytorch.org/whl/cu128 --no-warn-script-location
+        %PYTHON_CONSOLE_PATH% -m pip install torch torchaudio torchvision --index-url https://download.pytorch.org/whl/cu128 --no-warn-script-location
         echo.
         if errorlevel 1 (
             echo Failed to install PyTorch.
@@ -304,8 +303,7 @@ if /I "%IS_NVIDIA%"=="true" (
         echo Skipping PyTorch installation.
     ) else (
         echo Installing PyTorch with CUDA (12.8) support...
-        :: Temporarily set the PyTorch version to 2.0.8 to prevent [WinError 1114] error.
-        %PYTHON_CONSOLE_PATH% -m pip install torch==2.8.0 torchaudio==2.8.0 torchvision==0.23.0 --extra-index-url https://download.pytorch.org/whl/cu128 --no-warn-script-location
+        %PYTHON_CONSOLE_PATH% -m pip install torch torchaudio torchvision --index-url https://download.pytorch.org/whl/cu128 --no-warn-script-location
         if errorlevel 1 (
             echo Failed to install PyTorch.
             pause

abogen/main.py

@@ -4,6 +4,24 @@ import platform
 import atexit
 import signal
 
+# Fix PyTorch DLL loading issue on Windows before importing PyQt6
+if platform.system() == "Windows":
+    import ctypes
+    import site
+    
+    for site_path in site.getsitepackages():
+        torch_lib_path = os.path.join(site_path, "torch", "lib")
+        if os.path.exists(torch_lib_path):
+            # Pre-load torch DLLs before Qt can interfere
+            for dll in ['c10.dll', 'torch_cpu.dll', 'torch_python.dll']:
+                dll_path = os.path.join(torch_lib_path, dll)
+                if os.path.exists(dll_path):
+                    try:
+                        ctypes.CDLL(dll_path)
+                    except Exception:
+                        pass
+            break
+
 # Qt platform plugin detection (fixes #59)
 try:
     from PyQt6.QtCore import QLibraryInfo

abogen/utils.py

@@ -257,6 +257,12 @@ def calculate_text_length(text):
 
 
 def get_gpu_acceleration(enabled):
+    """
+    Check GPU acceleration availability.
+    
+    Note: On Windows, torch DLLs must be pre-loaded in main.py before PyQt6
+    to avoid DLL initialization errors.
+    """
     try:
         import torch
         from torch.cuda import is_available as cuda_available