c++ - 如何在 C++ 中更改事件桌面墙纸

Question

您好，我想写一个小程序来更改 Windows 7 中的墙纸

我想使用下面的代码:

#include "windows.h"
#include "wininet.h"
#include "shlobj.h"
#include "wchar.h"
#include <iostream>

void  SetWallpaper(LPCWSTR file){
    CoInitializeEx(0,COINIT_APARTMENTTHREADED);
    IActiveDesktop* desktop;
    HRESULT status =       CoCreateInstance(CLSID_ActiveDesktop,NULL,CLSCTX_INPROC_SERVER,IID_IActiveDesktop,(void**)&desktop);
    WALLPAPEROPT wOption;
    ZeroMemory(&wOption, sizeof(WALLPAPEROPT));
    wOption.dwSize=sizeof(WALLPAPEROPT);
    wOption.dwStyle = WPSTYLE_CENTER;
    status = desktop->SetWallpaper(file,0);
    wcout << status << endl;
    status = desktop->SetWallpaperOptions(&wOption,0);
    wcout << status << endl;
    status = desktop->ApplyChanges(AD_APPLY_ALL);
    wcout << status << endl;
    desktop->Release();
    CoUninitialize();
}
int wmain(int argc, wchar* argv[]){
    if(argc<=1){
        wcout << "use: " << argv[0] <<" path_to_pic.bmp" <<endl;
    }else{
        wchar_t* file = argv[1];
        SetWallpaper(file);
    }
    getchar();
    return 0;
}

但此代码不会更改墙纸，它只会在调用 ApplyChanges 后给我 hresult error-code 80070002。

我做错了什么请帮忙

Answer 1

请将您的主入口函数从

int main(int argc, char* argv[])

到

int wmain(int argc, wchar_t* argv[] )

不需要像 wchar_t* file = (wchar_t*)argv[1]; 这样的强制转换，它将像您的 wmain arguments are already in wchar_t* 一样工作

我能够使用你的代码和我的修改并更改我的电脑墙纸