用createwindow 为啥没窗口出来？？？

Posted 2023-03-14

#include<windows.h>int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,                    PSTR szCmdLine, int iCmdShow) HWND         hwnd ;hwnd=CreateWindow( "MySub ", "Test ",WS_BORDER, 50, 50, 140, 100, NULL, (HMENU)121, NULL, NULL);      return 0 ;编译通过运行起没窗口是咋回事

首先，你的窗口类注册了吗？也就是RegisterClass。。。
没注册窗口类CreateWindow就会调用失败。
其次，你创建的窗口没有WS_VISIBLE 属性，这样的窗口需要调用ShowWindow来显示。
给你一个完整的小实例吧
#include <windows.h>
LRESULT CALLBACK WinProc(HWND,UINT,WPARAM,LPARAM);
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR szCmdLine,int iCmdShow)

TCHAR szname[]=TEXT("classname");
HWND hwnd;
MSG msg;
ZeroMemory(&msg,sizeof(msg));
WNDCLASS wndclass;
wndclass.style=CS_HREDRAW | CS_VREDRAW;
wndclass.lpfnWndProc=WinProc;
wndclass.cbClsExtra=0;
wndclass.cbWndExtra=0;
wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);
wndclass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
wndclass.hInstance=hInstance;
wndclass.lpszClassName=szname;
wndclass.lpszMenuName=NULL;
RegisterClass(&wndclass);
hwnd=CreateWindow(szname,TEXT("windowsnametest"),WS_OVERLAPPEDWINDOW ,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,NULL,NULL,hInstance,NULL);
if(hwnd)
ShowWindow(hwnd,SW_SHOW);
else

MessageBox(NULL,TEXT("创建窗口失败！"),TEXT("提示"),MB_OK);
UnregisterClass(szname,hInstance);
return 1;

UpdateWindow(hwnd);

while(GetMessage(&msg,hwnd,0,0)>0)

TranslateMessage(&msg);
DispatchMessage(&msg);

UnregisterClass(szname,hInstance);
return msg.wParam;

LRESULT CALLBACK WinProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)

switch(message)

case WM_CLOSE:
DestroyWindow(hwnd);
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd,message,wParam,lParam);

return 0;
参考技术A 如果窗口创建成功的话.
那么还需要调用ShowWindow这个API,
窗口刚创建的时候默认是隐藏的

ShowWindow(hwnd, SW_SHOW); // 显示窗口
ShowWindow(hwnd,SW_HIDE); // 隐藏窗口

此外, 还需要 UpdateWindow来刷新.
具体百度这个2函数, 百科有很详细的解释 参考技术B 因为你只是创建了窗口，你并没有显示以及更新窗口，你必须在创建之后继续显示更新窗口。 参考技术C WS_BORDER | WS_VISIBLE

我使用vc++编程，我使用RegisterClassEx注册了窗口类，怎么用CreateWindow创建该类的MDI窗口？

使用RegisterClassEx创建子窗口类后，
使用CreateWindow(_TEXT("MDICLIENT"), NULL, WS_CHILD | WS_CLIPCHILDREN | WS_VISIBLE,
0, 0, rectMain.right, 50, hWnd, NULL, hInstance, (PSTR)&lsSet1);
创建了hwnd的MDI窗口，怎样才能使新创建的MDI窗口与刚刚注册的窗口类相关联呢？

看看这个 希望对你有帮助

#include <windows.h>
#include <tchar.h>

HINSTANCE hInst;

ATOM WindowRegister(WNDPROC lpfnWndProc, char *lpClname, HBRUSH hbrBack)

WNDCLASSEX wnd;

wnd.cbClsExtra = 0;
wnd.cbSize = sizeof(WNDCLASSEX);
wnd.cbWndExtra = 0;
wnd.hbrBackground = hbrBack;
wnd.hCursor = LoadCursor(NULL, IDC_ARROW);
wnd.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wnd.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
wnd.hInstance = hInst;
wnd.lpfnWndProc = lpfnWndProc;
wnd.lpszClassName = lpClname;
wnd.lpszMenuName = NULL;
wnd.style = CS_HREDRAW | CS_VREDRAW;

return RegisterClassEx(&wnd);


LRESULT CALLBACK ClientProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)

HWND hWndEdit;

switch (uMsg)

case WM_CREATE:
RECT rect;

GetClientRect(hWnd, &rect);

hWndEdit = CreateWindowEx(WS_EX_CLIENTEDGE, TEXT("Edit"), NULL,
WS_CHILD | WS_VISIBLE | WS_VSCROLL | WS_HSCROLL | ES_AUTOVSCROLL | ES_AUTOHSCROLL | ES_MULTILINE,
0, 0, rect.right, rect.bottom, hWnd, NULL, hInst, NULL);
return 0;
case WM_SIZE:
hWndEdit = GetWindow(hWnd, GW_CHILD);

GetClientRect(hWnd, &rect);
SetWindowPos(hWndEdit, NULL, 0, 0, rect.right, rect.bottom, SWP_NOMOVE | SWP_NOZORDER);
break;
case WM_MDIACTIVATE:
return 0;


return DefMDIChildProc(hWnd, uMsg, wParam, lParam);


LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)

static HWND hClient;

MDICREATESTRUCT mdic;

switch (uMsg)

case WM_CREATE:
WindowRegister(ClientProc, _T("Client"), (HBRUSH)GetStockObject(WHITE_BRUSH));

HMENU hMenu;

hMenu = CreateMenu();

AppendMenu(hMenu, MF_STRING, 1000, _T("New(&N)"));
SetMenu(hWnd, hMenu);

CLIENTCREATESTRUCT ccs;

ccs.hWindowMenu = NULL;
ccs.idFirstChild = 100;

hClient = CreateWindow(_T("MDICLIENT"), NULL,
WS_CHILD | WS_VISIBLE | WS_CLIPCHILDREN,
0, 0, 0, 0, hWnd, NULL, hInst, &ccs);
return 0;
case WM_DESTROY: PostQuitMessage(0); return 0;
case WM_COMMAND:
switch (LOWORD(wParam))

case 1000:
mdic.szClass = _T("Client");
mdic.szTitle = _T("Document");
mdic.hOwner = hInst;
mdic.x = CW_USEDEFAULT;
mdic.y = CW_USEDEFAULT;
mdic.cx = CW_USEDEFAULT;
mdic.cy = CW_USEDEFAULT;
mdic.style = 0;
mdic.lParam = 0;

HWND hChild;

hChild = (HWND)SendMessage(hClient, WM_MDICREATE, 0, (LPARAM)&mdic);
break;
default:
hChild = (HWND)SendMessage(hClient, WM_MDIGETACTIVE, 0, 0);

if (IsWindow(hChild)) SendMessage(hChild, WM_COMMAND, wParam, lParam);

break;

break;


return DefFrameProc(hWnd, hClient, uMsg, wParam, lParam);


INT WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, INT nShowCmd)

hInst = hInstance;

WindowRegister(WndProc, _T("Sample"), (HBRUSH)(COLOR_APPWORKSPACE + 1));

HWND hWnd = CreateWindow(_T("Sample"), _T("Sample"),
WS_OVERLAPPEDWINDOW | WS_CLIPCHILDREN,
100, 100, 500, 400, NULL, NULL, hInstance, NULL);

if (!hWnd) return FALSE;

HWND hClient = GetWindow(hWnd, GW_CHILD);

ShowWindow(hWnd, nShowCmd);
UpdateWindow(hWnd);

MSG msg;

while (GetMessage(&msg, NULL, 0, 0))

if (!TranslateMDISysAccel(hClient, &msg))

TranslateMessage(&msg);
DispatchMessage(&msg);



return msg.wParam;
参考技术A 你在用CreateWindow函数创建窗口时，该函数的第一个参数，是窗口类名，你只要用你上面注册的窗口类的类名，这样就联系上了。