getlasterror 0

MongoDB 3.0 Security Permission access controlMongoDB 3.0 access control has changed a lot, you need to pay attention to this parameter authenticationmechanisms. To use the 2.6 version, I directly specify the following

I. INTRODUCTIONMany people complain that mongodb is a memory database and has no transactions and may be insecure. In fact, this is a misunderstanding of Mongodb. Mongodb has a complete redolog, binlog, and persistence mechanism, do not worry too

This is really strange. It is clear that createmediawex has failed, but it is followed by getlasterror but returns 0 to say it is successful. Fuck Widnows! In fact, the window fails to be created because the registered window handler does not

When compiling applications in VC, it is often necessary to handle errors. Many function calls only use True or false to indicate the function running result. Once an error occurs, msdn often points out that you should use the getlasterror ()

Errors may inevitably occur during Win32 programming. The biggest headache is that you don't know where the error is and why it is wrong. Microsoft also thinks about this. Therefore, it provides a good function getlasterror (), this function returns

VC GetLastError () get the use of error informationWhen you write an application in VC, you often need to deal with error handling issues. Many function calls use only true and false to indicate the result of a function's operation. In the event of

Introduction to the getlasterror () function This is a very simple function. Its function is to obtain the error code generated during the previous function operation.Through the error code, you can find the meaning of each error code in the

1 voidCstockserverdlg::errorexit (LPTSTR lpszfunction)//Error function2 {3 //Retrieve The system error message for the Last-error code4 5 lpvoid lpMsgBuf;6 lpvoid lpdisplaybuf;7DWORD DW =GetLastError ();8 9 FormatMessage

Many Windows API functions do not return values to express error messages. Instead, they allow callers to Use API getlasterror () to obtain error codes.   When debugging the program, we can see that the API function call failed. We want to see the

Error handling, displaying the reason void __fastcall TSerialPort::ProcessErrorMessage(char* ErrorText) { char ErrorMsg[400]; LPVOID lpMsgBuf; FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER| //自动分配消息缓冲区 FORMAT_MESSAGE_FROM_SYSTEM, //从系统获取信息