代码如下：
#include
#include
#include
using namespace Gdiplus;
#pragma comment(lib, "gdiplus.lib")
const std::wstring watermarkText = L"Your Watermark Text";
const int watermarkFontSize = 38;
const int watermarkSpacing = 100;
void DrawWatermark(HDC hdc, int windowWidth, int windowHeight)
{
// 初始化 GDI+
GdiplusStartupInput gdiplusStartupInput;
ULONG_PTR gdiplusToken;
GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);
SetBkMode(hdc, TRANSPARENT);
// 创建 Graphics 对象
Graphics graphics(hdc);
// 创建字体
FontFamily fontFamily(L"Arial");
Font font(&fontFamily, watermarkFontSize, FontStyleRegular, UnitPixel);
// 设置文本颜色
SolidBrush textBrush(Color(255, 0, 0, 0)); // 文本颜色为黑色
// 获取文本尺寸
RectF layoutRect;
graphics.MeasureString(watermarkText.c_str(), -1, &font, PointF(0, 0), &layoutRect);
// 计算水印文本块的总数以填满整个屏幕
int numBlocksX = (windowWidth + watermarkSpacing) / (static_cast[i](layoutRect.Width) + watermarkSpacing);
int numBlocksY = (windowHeight + watermarkSpacing) / (static_cast[i](layoutRect.Height) + watermarkSpacing);
// 计算实际的间距
int actualSpacingX = (windowWidth - numBlocksX * static_cast[i](layoutRect.Width)) / (numBlocksX - 1);
int actualSpacingY = (windowHeight - numBlocksY * static_cast[i](layoutRect.Height)) / (numBlocksY - 1);
// 保存当前的世界变换矩阵
Matrix oldTransform;
graphics.GetTransform(&oldTransform);
// 绘制水印文本块
for (int y = 0; y (textX), static_cast(textY));
graphics.RotateTransform(-45.0f);
// 绘制水印文本
graphics.DrawString(watermarkText.c_str(), -1, &font, PointF(0, 0), &textBrush);
// 恢复原始的世界变换矩阵
graphics.SetTransform(&oldTransform);
}
}
// 关闭 GDI+
GdiplusShutdown(gdiplusToken);
}
LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_CREATE:
{
// 设置窗口样式为 WS_EX_LAYERED
SetWindowLong(hwnd, GWL_EXSTYLE, GetWindowLong(hwnd, GWL_EXSTYLE) | WS_EX_LAYERED | WS_EX_TRANSPARENT);
// 设置窗口为完全透明
SetLayeredWindowAttributes(hwnd, RGB(0, 0, 0), 0, LWA_COLORKEY);
// 设置窗口大小为屏幕大小
int windowWidth = GetSystemMetrics(SM_CXSCREEN);
int windowHeight = GetSystemMetrics(SM_CYSCREEN);
SetWindowPos(hwnd, HWND_TOPMOST, 0, 0, windowWidth, windowHeight, SWP_SHOWWINDOW);
break;
}
case WM_PAINT:
{
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hwnd, &ps);
int windowWidth = GetSystemMetrics(SM_CXSCREEN);
int windowHeight = GetSystemMetrics(SM_CYSCREEN);
// 绘制水印
DrawWatermark(hdc, windowWidth, windowHeight);
EndPaint(hwnd, &ps);
break;
}
case WM_DESTROY:
{
PostQuitMessage(0);
break;
}
default:
return DefWindowProc(hwnd, message, wParam, lParam);
}
return 0;
}
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
WNDCLASSEX wcex;
ZeroMemory(&wcex, sizeof(WNDCLASSEX));
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.lpfnWndProc = WndProc;
wcex.hInstance = hInstance;
wcex.lpszClassName = L"WatermarkWindowClass";
RegisterClassEx(&wcex);
HWND hwnd = CreateWindow(L"WatermarkWindowClass", L"", WS_POPUP, 0, 0, GetSystemMetrics(SM_CXSCREEN), GetSystemMetrics(SM_CYSCREEN), NULL, NULL, hInstance, NULL);
if (hwnd == NULL)
{
return 0;
}
ShowWindow(hwnd, nCmdShow);
MSG msg;
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return static_cast[i](msg.wParam);
}
