在桌面上呈现形状和文本（点击）

Question

对于Windows 7，将任意形状和文本直接呈现在桌面上的最简单方法是什么？

它必须具有以下性质：

1）可见光和总在最前面
3）半透明
2）点击通过并输入通过，仿佛对象不存在

一些值得注意的例子包括渲染帧速率的简单Fraps，以及具有大量功能的复杂Rainmeter。

EDIT0：我已经看过了Rainmeter的源代码，但我仍然不知道它是如何呈现的对象......

EDIT1：Window Hud Behavior (Pass through clicks, can't be minimized)（解决方案如这似乎非常严格，必须有呈现方式？东西尽可能多的自由，Rainmeter的）

Answer 1

我仍然在做这个工作，但这里是它的一部分：

#include <algorithm> 
#include <Windows.h> 
#include <stdlib.h> 
#include <iostream> 
#include <sstream> 
#include <conio.h> 
#include <iomanip> 
#include <sstream> 
#include <fstream> 
#include <stdio.h> 
#include <cstdlib> 
#include <string> 
#include <memory> 
#include <cstdio>    
#include <glut.h> 
#include <io.h> 

#using <mscorlib.dll> 
#using <System.dll> 

using namespace System; 
using namespace std; 

#pragma comment(lib, "wininet.lib") 
#pragma comment (lib, "Urlmon.lib") 
#pragma comment(linker, "/subsystem:windows /ENTRY:mainCRTStartup") 

HINSTANCE hInstance; 
POINT Mouse; 
HWND hwnd; 
RECT rect; 
HDC dc; 

float Size = 100; 
float angle = 0; 
bool Dirty = false; 
char TEX; 
int posX = 0; 
int posY = 0; 
int storedDC; 

void GetDesktopResolution(int& w, int& h){ 
    RECT desktop; 
    const HWND hDesktop = GetDesktopWindow(); 
    GetWindowRect(hDesktop, &desktop); 
    w = desktop.right; 
    h = desktop.bottom; 
} 

void EX(){ 
    delete hInstance; 
    delete hwnd; 
    exit(0); 
} 

void Keys(){ 
    if (GetAsyncKeyState(VK_ESCAPE)){ 
     exit(0); 
    } 

    if (GetAsyncKeyState(VK_LBUTTON) && GetAsyncKeyState(VK_CONTROL)){ 

    } 
} 

void Draw(){ 
    int h; 
    int w; 

    //Declair Desktop Size 
    GetDesktopResolution(w, h); 

    angle += 0.1f; 

    if (angle >= 2 * 3.141592f){ 
     angle -= 2 * 3.141592f; 
    } 

    GetCursorPos(&Mouse); 
    if (Dirty == true){ 
     rect = { 0, 0, w, h }; 
     RedrawWindow(hwnd, &rect, NULL, RDW_INVALIDATE | RDW_ERASE | RDW_UPDATENOW); 

     posX = Mouse.x; 
     posY = Mouse.y; 

     RedrawWindow(hwnd, &rect, NULL, RDW_INVALIDATE | RDW_ERASE | RDW_UPDATENOW); 
     Dirty = false; 
    } 

    dc = GetDC(hwnd); 
    storedDC = SaveDC(dc); 

    //DEFAULT_CHARSET - ANSI_CHARSET 
    HFONT FMain = CreateFont(36, 20, -300, 0, FW_DONTCARE, FALSE, TRUE, FALSE, DEFAULT_CHARSET, OUT_OUTLINE_PRECIS, 
     CLIP_DEFAULT_PRECIS, CLEARTYPE_QUALITY, VARIABLE_PITCH, TEXT("Times New Roman")); 
    SetTextColor(dc, RGB(255, 255, 255)); 
    SetBkColor(dc, RGB(0, 255, 0)); 
    SelectObject(dc, FMain); 
    TextOut(dc, 15, 15, L"This is what the program does!", 30); 

    RedrawWindow(hwnd, &rect, NULL, RDW_NOERASE | RDW_INVALIDATE | RDW_UPDATENOW); 

    RestoreDC(dc, storedDC); 
    ReleaseDC(hwnd, dc); 
} 

int main(int argc, char **argv){ 
    int h; 
    int w; 

    //Declair Desktop Size 
    GetDesktopResolution(w, h); 

    // find Program Manager 
    hwnd = FindWindowEx(GetDesktopWindow(), 0, L"Progman", L"Program Manager"); 
    // find SHELLDLL_DefView 
    hwnd = FindWindowEx(hwnd, 0, L"SHELLDLL_DefView", 0); 
    // find Desktop Folder 
    hwnd = FindWindowEx(hwnd, 0, L"SysListView32", L"FolderView"); 

    if (hwnd == NULL){ 
     MessageBox(NULL, L"Could not initiate window!", L"ERROR!", MB_OK); 
     EX(); 
    } 

    while (1){ 
     Keys(); 
     Draw(); 
    } 

    //Remove the drawing 
    rect = { Mouse.x - 50, Mouse.y - 50, Mouse.x + 50, Mouse.y + 50 }; 
    InvalidateRect(hwnd, &rect, true); 

    delete hInstance; 
    delete hwnd; 

    return 0; 
}