Why is my DLL loading failing with \"ImportError: DLL load failed: %1 is not a valid Win32 application\"?

DLL Load Failure in Import: Invalid Win32 Application

Encountering the error "ImportError: DLL load failed: %1 is not a valid Win32 application" despite the presence of DLLs can be frustrating. One possible cause, as identified by the user, is the mismatch between the bitness of the loaded DLL and the system environment.

The user has installed OpenCV in a 64-bit system with a 64-bit Python interpreter. However, they have noticed that the cv2.pyd file located in C:libopencvbuildpython2.7 is a 32-bit version. This mismatch could lead to loading failures.

To resolve this issue, the user should obtain a 64-bit version of cv2.pyd. They can refer to the "Unofficial Windows Binaries for Python Extension Packages" website to find and download the appropriate binary.

Once the 64-bit version of cv2.pyd is installed, ensure that the PYTHONPATH environment variable points to its location. The user should also check that the PATH variable includes the path to the OpenCV binaries folder, such as C:libopencvbuildx64vc11bin.

If the issue persists, the user can try the following:

• Verify that all necessary DLLs are present in the specified folder and that they are compatible with the system architecture.
• Use a tool like Dependency Walker to identify any missing or invalid DLLs.
• Set the environment variable DEBUGLOGGING=on to enable verbose output during DLL loading, allowing the user to pinpoint the specific DLL that is failing to load.

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