学步园

这个程序仅供编程参考

若想在平时用，请下载微软的wallpaper changer

我这个程序实现了定时更换桌面背景的功能

命令行 wallpaper "your images' directory path" time_in_minute

编程要点

findfirstfile findnextfile 查找图像文件

SystemParametersInfo  修改系统信息，在这儿当然是桌面背景

注册表操作 保存信息

如果做得实用，应加入开机启动功能，自然还要gui

//wallpaper.c<br /> //by onezeros@yahoo.cn||Zhijie Lee<br /> //usage:wallpaper "full directory path" interval<br /> // interval is in minutes</p> <p>#include <windows.h><br /> #include <iostream><br /> #include <string><br /> using namespace std;</p> <p>int main(int argc, char* argv[])<br /> {<br /> /* argc=3;<br /> argv[1]="E://picture//testbmp";<br /> argv[2]="1";<br /> */ LPCSTR currentDir;<br /> LPCSTR currentImage;<br /> int interval;</p> <p> HKEY hKey;<br /> WIN32_FIND_DATAA FileData;<br /> HANDLE hFind;</p> <p> //initialize parameters<br /> if(argc==1){<br /> //find parameters in registry<br /> if(RegOpenKeyA(HKEY_LOCAL_MACHINE,(LPCSTR)"Software//wallpaper",<br /> &hKey)!=ERROR_SUCCESS||<br /> RegQueryValueExA(hKey,(LPCSTR)"interval",0,NULL,<br /> (LPBYTE)interval,NULL)!=ERROR_SUCCESS||<br /> RegQueryValueExA(hKey,(LPCSTR)"directory",0,NULL,<br /> (LPBYTE)currentDir,NULL)!=ERROR_SUCCESS||<br /> RegQueryValueExA(hKey,(LPCSTR)"image",0,NULL,<br /> (LPBYTE)currentImage,NULL)!=ERROR_SUCCESS){<br /> //if connot be found ,wrong usage<br /> cout<<"wrong usage"<<endl<br /> <<"Please use it like this"<<endl<br /> <<"wallpaper /"D://Files//Images/" 30"<<endl<br /> <<"30 is the interval in minutes or"<<endl<br /> <<"wallpaper /"D://Files//Images/""<<endl<br /> <<"with 30 minutes as default interval"<<endl;<br /> exit(1);<br /> }else{<br /> hFind=FindFirstFileA(currentImage,&FileData);<br /> if(hFind==INVALID_HANDLE_VALUE){<br /> cout<<"connot open file";<br /> exit(1);<br /> }<br /> }<br /> }else if(argc==3){<br /> interval=60000*atoi(argv[2]);<br /> currentDir=(LPCSTR)argv[1];<br /> SetCurrentDirectoryA(currentDir);<br /> hFind = FindFirstFileA((LPCSTR)"*.jpg",&FileData);<br /> //hFind = FindFirstFileA((LPCSTR)"228973.jpg",&FileData);<br /> if (hFind == INVALID_HANDLE_VALUE) {<br /> cout<<"Invalid directory.Last Error reports "<<endl;<br /> exit(1);<br /> } else {<br /> currentImage=FileData.cFileName;<br /> //register the directory<br /> RegCreateKeyA(HKEY_LOCAL_MACHINE,(LPCSTR)"Software//wallpaper",&hKey);<br /> RegSetValueExA(hKey,(LPCSTR)"directory",0,REG_SZ,<br /> (CONST BYTE*)currentDir,strlen((const char*)currentDir));<br /> RegSetValueExA(hKey,(LPCSTR)"image",0,REG_SZ,<br /> (CONST BYTE*)currentImage,strlen((const char*)currentImage));<br /> RegSetValueExA(hKey,(LPCSTR)"interval",0,REG_DWORD,<br /> (CONST BYTE*)&interval,4);<br /> }<br /> }else{//wrong parameters<br /> cout<<"wrong parameters"<<endl;<br /> exit(1);<br /> }</p> <p> //circle and wait<br /> while(1){<br /> //set wallpaper<br /> bool b=false;<br /> string fullpath((char*)currentDir);<br /> fullpath+=string("//");<br /> fullpath+=string((char*)currentImage);<br /> b=SystemParametersInfoA(SPI_SETDESKWALLPAPER, 0,(PVOID)fullpath.c_str(),SPIF_UPDATEINIFILE+SPIF_SENDWININICHANGE);</p> <p> if(b==false){<br /> cout<<"failed to call /"SystemParametersInfoA/" ";<br /> exit(1);<br /> }<br /> Sleep(interval);<br /> if (!FindNextFileA(hFind, &FileData)){<br /> if (GetLastError() == ERROR_NO_MORE_FILES){<br /> hFind = FindFirstFileA((LPCSTR)"*.jpg",&FileData);<br /> }else{<br /> printf("Couldn't find next file.");<br /> exit(1);<br /> }<br /> }<br /> currentImage=FileData.cFileName;<br /> //register the currentfile<br /> RegSetValueExA(hKey,(LPCSTR)"image",0,REG_SZ,<br /> (CONST BYTE*)currentImage,strlen((const char*)currentImage));<br /> }</p> <p> //FindClose(hFind);<br /> //RegCloseKey(hKey);</p> <p> return 0;<br /> }</p> <p>