TRACE
TRACE( exp )ParametersexpSpecifies a variable number of arguments that are used in exactly the same way that a variable number of arguments are used in the run-time function printf.ResProvides similar functionality to the printf function by sending a formatted string to a dump device such as a file or debug monitor. Like printf for C programs under MS-DOS, the TRACE macro is a convenient way to track the value of variables as your program executes. In the Debug environment, the TRACE macro output goes to afxDump. In the Release environment, it does nothing.TRACE is limited to sending a total of 512 characters at a time. If you call TRACE with formatting commands, the total string length after the formatting commands have been expanded cannot be more than 512 characters, including the terminating NULL. Exceeding this limit causes an ASSERT.Note This macro is available only in the debug version of MFC.
TRACE( exp )ParametersexpSpecifies a variable number of arguments that are used in exactly the same way that a variable number of arguments are used in the run-time function printf.ResProvides similar functionality to the printf function by sending a formatted string to a dump device such as a file or debug monitor. Like printf for C programs under MS-DOS, the TRACE macro is a convenient way to track the value of variables as your program executes. In the Debug environment, the TRACE macro output goes to afxDump. In the Release environment, it does nothing.TRACE is limited to sending a total of 512 characters at a time. If you call TRACE with formatting commands, the total string length after the formatting commands have been expanded cannot be more than 512 characters, including the terminating NULL. Exceeding this limit causes an ASSERT.Note This macro is available only in the debug version of MFC.
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2.TRACE(str);
str 为CString 或 char[],char*
我只用过这两种方法
if(...)MessageBox("hello")比如说在Create中,Trace0("fail to Create...");程序会在创建失败时弹出MessageBox();