Solution and cause analysis of cfiledialog class crash for no reason

Apply in the simplest MFC dialog boxProgramUse the cfiledialog object to open the file dialog box. The interface is normally opened for the first time. After the dialog box is called up for the second time, as long as you shake the mouse on the file, it will crash and the debugger is disconnected from the shell32.dll module. Unhandled exception in test.exe (shell32.dll): 0xc0000005 access voilation. But changing to a virtual machine or another machine will be fine. After further debugging, it is found that a component of Adobe Acrobat uses shell extension programming. This cause was found for half a day, so we recorded it here to avoid forgetting it later. The solution is simple. Just call afxoleinit (); In the initinstance function of the application cwinapp.