WIN32创建居中对话框

这里给出的方法是在 WM_INITDIALOG 事件里实现居中处理。
下面是对话框窗口过程以及主函数：

// 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;
}

本文地址：https://blog.csdn.net/Kwansy/article/details/107266963