win32接收图片数据并明显,不将图片制成文件
时间: 2023-06-20 07:08:42 浏览: 139
可以使用以下方法在Win32应用程序中接收图片数据并显示:
1. 使用socket接收图片数据,将数据存储在缓冲区中。
2. 使用GDI+库创建一个Bitmap对象,从缓冲区中加载像素数据。
3. 在窗口中绘制Bitmap对象。
下面是一个简单的示例代码,演示如何在Win32应用程序中接收并显示图片数据:
```c++
#include <Winsock2.h>
#include <Gdiplus.h>
#pragma comment(lib, "ws2_32.lib")
#pragma comment(lib, "Gdiplus.lib")
LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
// 创建窗口
WNDCLASS wc = {0};
wc.lpfnWndProc = WndProc;
wc.hInstance = hInstance;
wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
wc.lpszClassName = "MyWindowClass";
RegisterClass(&wc);
HWND hWnd = CreateWindow("MyWindowClass", "My Window", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 640, 480, NULL, NULL, hInstance, NULL);
ShowWindow(hWnd, nCmdShow);
// 初始化Winsock
WSADATA wsaData;
WSAStartup(MAKEWORD(2, 2), &wsaData);
// 创建socket
SOCKET sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (sock == INVALID_SOCKET)
{
MessageBox(hWnd, "Failed to create socket!", "Error", MB_OK | MB_ICONERROR);
return 0;
}
// 连接到服务器
SOCKADDR_IN serverAddr;
serverAddr.sin_family = AF_INET;
serverAddr.sin_port = htons(12345);
serverAddr.sin_addr.s_addr = inet_addr("127.0.0.1");
if (connect(sock, (SOCKADDR*)&serverAddr, sizeof(serverAddr)) == SOCKET_ERROR)
{
MessageBox(hWnd, "Failed to connect to server!", "Error", MB_OK | MB_ICONERROR);
closesocket(sock);
return 0;
}
// 接收图片数据
const int bufferSize = 640 * 480 * 4; // 假设图片大小为640x480,每个像素4个字节
char buffer[bufferSize];
int receivedBytes = 0;
while (receivedBytes < bufferSize)
{
int ret = recv(sock, buffer + receivedBytes, bufferSize - receivedBytes, 0);
if (ret == SOCKET_ERROR)
{
MessageBox(hWnd, "Failed to receive image data!", "Error", MB_OK | MB_ICONERROR);
closesocket(sock);
return 0;
}
receivedBytes += ret;
}
// 显示图片
Gdiplus::GdiplusStartupInput gdiplusStartupInput;
ULONG_PTR gdiplusToken;
Gdiplus::GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);
Gdiplus::Bitmap bitmap(640, 480, 640 * 4, PixelFormat32bppARGB, (BYTE*)buffer);
HDC hdc = GetDC(hWnd);
Graphics graphics(hdc);
graphics.DrawImage(&bitmap, 0, 0);
ReleaseDC(hWnd, hdc);
Gdiplus::GdiplusShutdown(gdiplusToken);
// 关闭socket
closesocket(sock);
// 消息循环
MSG msg;
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 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;
}
```
在这个示例中,我们使用了GDI+库来加载和显示图片。GDI+是一个图形处理库,可以方便地处理图像、绘制图形和文本等任务。在接收到图片数据后,我们将数据存储在一个缓冲区中,并使用GDI+库创建了一个Bitmap对象,然后在窗口中绘制了这个Bitmap对象。
注意,这个示例中的图片大小是固定的,如果你要接收不同大小的图片,需要根据实际情况调整缓冲区大小和Bitmap对象的参数。
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