vs中图像太大,无法显示完整,加入以下程序,设置一个窗口框
时间: 2023-08-11 11:05:21 浏览: 46
您可以使用以下代码在 Visual Studio 中创建一个窗口并在窗口中显示图像:
```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)
{
// Load the image file
HBITMAP hBitmap = (HBITMAP)LoadImage(NULL, "image.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
// Get the dimensions of the image
BITMAP bmp;
GetObject(hBitmap, sizeof(bmp), &bmp);
// Calculate the size of the window based on the image dimensions
int width = bmp.bmWidth + GetSystemMetrics(SM_CXSIZEFRAME) * 2;
int height = bmp.bmHeight + GetSystemMetrics(SM_CYSIZEFRAME) * 2 + GetSystemMetrics(SM_CYCAPTION);
// Register the window class
const char CLASS_NAME[] = "My Window Class";
WNDCLASS wc = {};
wc.lpfnWndProc = WndProc;
wc.hInstance = hInstance;
wc.lpszClassName = CLASS_NAME;
RegisterClass(&wc);
// Create the window
HWND hwnd = CreateWindowEx(
0,
CLASS_NAME,
"My Window",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT, width, height,
NULL,
NULL,
hInstance,
NULL
);
if (hwnd == NULL)
{
return 0;
}
// Display the image in the window
HDC hdc = GetDC(hwnd);
HDC hdcMem = CreateCompatibleDC(hdc);
SelectObject(hdcMem, hBitmap);
BitBlt(hdc, GetSystemMetrics(SM_CXSIZEFRAME), GetSystemMetrics(SM_CYSIZEFRAME) + GetSystemMetrics(SM_CYCAPTION), bmp.bmWidth, bmp.bmHeight, hdcMem, 0, 0, SRCCOPY);
DeleteDC(hdcMem);
ReleaseDC(hwnd, hdc);
// Show the window
ShowWindow(hwnd, nCmdShow);
// Run the message loop
MSG msg = {};
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 0;
}
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;
}
```
在这个示例中,我们首先加载了一个名为 "image.bmp" 的位图文件,并获取了它的宽度和高度。然后,我们根据图像的尺寸计算出窗口的大小,并使用 `CreateWindowEx` 函数创建了一个窗口。接下来,我们将图像显示在窗口中,最后运行消息循环,直到用户关闭窗口。