這里給出的方法是在 WM_INITDIALOG 事件里實現居中處理。
下面是對話框窗口過程以及主函數：

// EncryptMain.cpp : Defines the entry point for the application. //#include "stdafx.h"BOOL CALLBACK MainDialogProc(HWND hDlg, UINT uMsg, WPARAM wParam, LPARAM lParam);int APIENTRY WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow) {// TODO: Place code here.DialogBox(hInstance, MAKEINTRESOURCE(IDD_DIALOG_MAIN), NULL, MainDialogProc);return 0; }BOOL CALLBACK MainDialogProc(HWND hDlg, UINT uMsg, WPARAM wParam, LPARAM lParam) {switch (uMsg){case WM_INITDIALOG: { HWND hwndOwner = NULL;RECT rcOwner, rcDlg, rc; // Get the owner window and dialog box rectangles. if ((hwndOwner = GetParent(hDlg)) == NULL) {hwndOwner = GetDesktopWindow(); } GetWindowRect(hwndOwner, &rcOwner); GetWindowRect(hDlg, &rcDlg); CopyRect(&rc, &rcOwner); // Offset the owner and dialog box rectangles so that right and bottom // values represent the width and height, and then offset the owner again // to discard space taken up by the dialog box. OffsetRect(&rcDlg, -rcDlg.left, -rcDlg.top); OffsetRect(&rc, -rc.left, -rc.top); OffsetRect(&rc, -rcDlg.right, -rcDlg.bottom); // The new position is the sum of half the remaining space and the owner's // original position. SetWindowPos(hDlg, HWND_TOP, rcOwner.left + (rc.right / 2), rcOwner.top + (rc.bottom / 2), 0, 0, // Ignores size arguments. SWP_NOSIZE); return TRUE;}case WM_CLOSE:{EndDialog(hDlg, 0);return TRUE;}}return FALSE; }

VOID CenterDialog(HWND hDlg) {HWND hwndOwner = NULL;RECT rcOwner, rcDlg, rc; // Get the owner window and dialog box rectangles. if ((hwndOwner = GetParent(hDlg)) == NULL) {hwndOwner = GetDesktopWindow(); } GetWindowRect(hwndOwner, &rcOwner); GetWindowRect(hDlg, &rcDlg); CopyRect(&rc, &rcOwner); // Offset the owner and dialog box rectangles so that right and bottom // values represent the width and height, and then offset the owner again // to discard space taken up by the dialog box. OffsetRect(&rcDlg, -rcDlg.left, -rcDlg.top); OffsetRect(&rc, -rc.left, -rc.top); OffsetRect(&rc, -rcDlg.right, -rcDlg.bottom); // The new position is the sum of half the remaining space and the owner's // original position. SetWindowPos(hDlg, HWND_TOP, rcOwner.left + (rc.right / 2), rcOwner.top + (rc.bottom / 2), 0, 0, // Ignores size arguments. SWP_NOSIZE); }

總結

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