运行debug,出现了以下这些信息:
Loaded 'C:\WINNT\System32\ntdll.dll', no matching symbolic information found.
Loaded 'C:\WINNT\system32\kernel32.dll', no matching symbolic information found.
Loaded 'C:\WINNT\system32\user32.dll', no matching symbolic information found.
Loaded 'C:\WINNT\system32\gdi32.dll', no matching symbolic information found.
Loaded 'C:\WINNT\system32\comdlg32.dll', no matching symbolic information found.
Loaded 'C:\WINNT\system32\shlwapi.dll', no matching symbolic information found.
Loaded 'C:\WINNT\system32\msvcrt.dll', no matching symbolic information found.
Loaded 'C:\WINNT\system32\advapi32.dll', no matching symbolic information found.
Loaded 'C:\WINNT\system32\rpcrt4.dll', no matching symbolic information found.
Loaded 'C:\WINNT\system32\comctl32.dll', no matching symbolic information found.
Loaded 'C:\WINNT\system32\shell32.dll', no matching symbolic information found.
Loaded 'C:\WINNT\system32\winspool.drv', no matching symbolic information found.
Loaded 'C:\WINNT\system32\mpr.dll', no matching symbolic information found.
Loaded 'C:\WINNT\system32\imm32.dll', no matching symbolic information found.
Loaded 'C:\WINNT\system32\nvdesk32.dll', no matching symbolic information found.
First-chance exception in canvas.exe: 0xC0000005: Access Violation.
The program 'D:\Program Files\Microsoft Visual Studio\MyProjects\canvas\Debug\canvas.exe' has exited with code 0 (0x0).