我正在编写涉及使用 unrar 的代码(WinForms C# NET 3.5)。
[DllImport("UNRAR64.DLL")]
private static extern IntPtr RAROpenArchive(ref RAROpenArchiveData archiveData);
[DllImport("UNRAR64.DLL")]
private static extern IntPtr RAROpenArchiveEx(ref RAROpenArchiveDataEx archiveData);
[DllImport("UNRAR64.DLL")]
private static extern int RARCloseArchive(IntPtr hArcData);
[DllImport("UNRAR64.DLL")]
private static extern int RARReadHeader(IntPtr hArcData, ref RARHeaderData headerData);
[DllImport("UNRAR64.DLL")]
private static extern int RARReadHeaderEx(IntPtr hArcData, ref RARHeaderDataEx headerData);
[DllImport("UNRAR64.DLL")]
private static extern int RARProcessFile(IntPtr hArcData, int operation, [MarshalAs(UnmanagedType.LPStr)] string destPath, [MarshalAs(UnmanagedType.LPStr)] string destName);
[DllImport("UNRAR64.DLL")]
private static extern void RARSetCallback(IntPtr hArcData, UNRARCallback callback, int userData);
[DllImport("UNRAR64.DLL")]
private static extern void RARSetPassword(IntPtr hArcData, [MarshalAs(UnmanagedType.LPStr)] string password);
因为我希望代码同时在 32BIT 和 64BIT 上工作,所以我想根据系统位数的检查通过字符串 unrarDll 分配 UNRAR64.DLL 或 UNRAR.DLL。
private void DllChoice() {
if (SystemIs64Bit()) {
sevenZipDll = "7z-x64.dll";
unrarDll = "unrar.dll";
} else {
sevenZipDll = "7x-x32.dll";
unrarDll = "unrar64.dll";
}
}
private static bool SystemIs64Bit() {
return (IntPtr.Size == 8);
}
抛出错误:
An attribute argument must be a constant expression, typeof expression or array creation expression of an attribute parameter type
有没有简单的方法解决这个问题?这样做的正确方法是什么?