用CreateWindow设置窗口大小和位置
时间: 2024-05-25 12:15:14 浏览: 19
Sure, you can use the CreateWindow function to set the size and position of a window. Here's an example parameter list for CreateWindow:
CreateWindow(lpClassName, lpWindowName, dwStyle, x, y, nWidth, nHeight, hWndParent, hMenu, hInstance, lpParam)
In the parameter list, you can set the values for x, y, nWidth, and nHeight to determine the position and size of the window. For example, if you want to set the window size to 800x600 and position it in the center of the screen, you can use:
CreateWindow("MyWindowClass", "My Window", WS_OVERLAPPEDWINDOW, (GetSystemMetrics(SM_CXSCREEN) - 800)/2, (GetSystemMetrics(SM_CYSCREEN) - 600)/2, 800, 600, NULL, NULL, hInstance, NULL);
相关问题
窗口应用程序背景图片怎么设置大小
要设置窗口应用程序的背景图片大小,您可以使用Win32 API中的GDI+库。以下是一个示例代码,可以将指定文件路径的图片作为背景图,并将其设置为窗口的背景,同时使其填充整个窗口。
```c++
#include <windows.h>
#include <gdiplus.h>
#pragma comment (lib,"Gdiplus.lib")
using namespace Gdiplus;
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_CREATE:
{
// 加载背景图片
Image* image = Image::FromFile(L"bg.jpg");
if (image == NULL)
return -1;
// 获取窗口大小
RECT rect;
GetClientRect(hWnd, &rect);
UINT width = rect.right - rect.left;
UINT height = rect.bottom - rect.top;
// 设置背景图片
Graphics graphics(hWnd);
graphics.DrawImage(image, 0, 0, width, height);
delete image;
}
break;
case WM_CLOSE:
DestroyWindow(hWnd);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
break;
}
return 0;
}
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
// 初始化GDI+
GdiplusStartupInput gdiplusStartupInput;
ULONG_PTR gdiplusToken;
GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);
// 创建窗口
const wchar_t CLASS_NAME[] = L"Sample Window Class";
WNDCLASS wc = {};
wc.lpfnWndProc = WndProc;
wc.hInstance = hInstance;
wc.lpszClassName = CLASS_NAME;
RegisterClass(&wc);
HWND hWnd = CreateWindow(CLASS_NAME, L"Sample Window", WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT, 800, 600, NULL, NULL, hInstance, NULL);
if (hWnd == NULL)
return 0;
ShowWindow(hWnd, nCmdShow);
// 消息循环
MSG msg = {};
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
// 释放GDI+
GdiplusShutdown(gdiplusToken);
return 0;
}
```
在上面的示例中,我们在WM_CREATE消息处理函数中加载了指定路径的背景图片,并使用Graphics类的DrawImage方法将其绘制到窗口的客户区。为了使背景图片填充整个窗口,我们在绘制时将图片的大小设置为窗口的大小。您可以根据需要调整图片路径和窗口大小。
使用CreateWindow函数的例子?
以下是使用CreateWindow函数创建窗口的示例代码:
```c++
#include <windows.h>
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam);
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
// Step 1: Register the Window Class
WNDCLASS wc = { 0 };
wc.lpfnWndProc = WndProc;
wc.hInstance = hInstance;
wc.hbrBackground = (HBRUSH)(COLOR_BACKGROUND);
wc.lpszClassName = "MyWindowClass";
RegisterClass(&wc);
// Step 2: Create the Window
HWND hwnd = CreateWindow(
"MyWindowClass", // Name of window class to use
"Hello, World!", // Title of window
WS_OVERLAPPEDWINDOW, // Style of window
CW_USEDEFAULT, // X position of window
CW_USEDEFAULT, // Y position of window
CW_USEDEFAULT, // Width of window
CW_USEDEFAULT, // Height of window
NULL, // Handle to parent window (none)
NULL, // Handle to menu (none)
hInstance, // Handle to application instance
NULL // Additional data (none)
);
// Step 3: Show and Update the Window
ShowWindow(hwnd, nCmdShow);
UpdateWindow(hwnd);
// Step 4: Run the Message Loop
MSG msg = { 0 };
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
// Step 5: Unregister the Window Class
UnregisterClass("MyWindowClass", hInstance);
return (int)msg.wParam;
}
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch (msg)
{
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd, msg, wParam, lParam);
}
return 0;
}
```
在此示例中,我们首先注册了一个名为"MyWindowClass"的窗口类,然后使用CreateWindow函数创建了一个窗口,并指定了窗口的标题、样式、位置和大小等信息。接下来,我们显示和更新了窗口,并运行了一个消息循环,以便响应用户的输入事件。最后,我们在窗口关闭时注销了窗口类。窗口过程函数WndProc负责处理窗口事件,例如当用户关闭窗口时,它会发送WM_DESTROY消息给窗口程序,这个程序会调用PostQuitMessage函数来退出消息循环并关闭应用程序。
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