Windows核心编程chapter one
#include "stdafx.h"#include效果#include #include "Resource.h"#include "MainDlg.h"BOOL WINAPI Main_Proc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam){ switch(uMsg) { HANDLE_MSG(hWnd, WM_INITDIALOG, Main_OnInitDialog); HANDLE_MSG(hWnd, WM_COMMAND, Main_OnCommand); HANDLE_MSG(hWnd,WM_CLOSE, Main_OnClose); } return FALSE;}BOOL Main_OnInitDialog(HWND hwnd, HWND hwndFocus, LPARAM lParam){ return TRUE;}void Main_OnCommand(HWND hwnd, int id, HWND hwndCtl, UINT codeNotify){ switch(id) { case IDC_BTN_LOOKUP: { //Get the error code DWORD dwError = GetDlgItemInt(hwnd,IDC_ERRORCODE,NULL,FALSE); HLOCAL hlocal = NULL; //Buffer that gets the error message string DWORD systemLocale = MAKELANGID(LANG_NEUTRAL,SUBLANG_NEUTRAL); //Get the error code's textual description BOOL fOk = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS|FORMAT_MESSAGE_ALLOCATE_BUFFER, NULL,dwError,systemLocale,(PTSTR)&hlocal,0,NULL); if (!fOk) { //Is it a network-related error? HMODULE hDll = LoadLibraryEx("netmsg.dll",NULL,DONT_RESOLVE_DLL_REFERENCES); if (hDll!=NULL) { fOk = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS|FORMAT_MESSAGE_ALLOCATE_BUFFER, hDll,dwError,systemLocale,(PTSTR)&hlocal,0,NULL); FreeLibrary(hDll); } } if (fOk && (hlocal!=NULL)) { SetDlgItemText(hwnd,IDC_TEXTAREA,(PCTSTR)LocalLock(hlocal)); LocalFree(hlocal); }else{ SetDlgItemText(hwnd,IDC_TEXTAREA,TEXT("No text found for this error number.")); } } break; default: break; }}void Main_OnClose(HWND hwnd){ EndDialog(hwnd, 0);}
