c++ - SystemParametersInfo 将背景设置为纯色而不是实际设置图片

Question

我已经尝试了这些帖子中指定的所有解决方案:

1. How to change the windows 10 wallpaper with C++?
2. How to change desktop background using VC++
3. SystemParametersInfo sets wallpaper completly black (using SPI_SETDESKWALLPAPER)

而且我仍然似乎无法让它工作....这是我的代码:

const wchar_t* path = L"C:\\imagge.png";
bool result = SystemParametersInfoW(SPI_SETDESKWALLPAPER, 0, (void*)path, SPIF_UPDATEINIFILE);
std::cout << result;

此外，如果我指定一个无效的路径，当它在 docs 上明确说明时，它仍会打印 1(true) SPI_SETDESKWALLPAPER 位，如果他们有问题，它应该返回 0(false)

我也试过调用打印 GetLastError(); 并返回 0....

Note When the SPI_SETDESKWALLPAPER flag is used, SystemParametersInfo returns TRUE unless there is an error (like when the specified file doesn't exist).

Answer 1

IInspectable 建议使用 IDesktopWallpaper interface

我成功了!

这是我的代码:

int main() {
std::wstring x = L"C:\\Users\\danie\\OneDrive\\Pictures\\pixelArt\\Sample.png";
HRESULT  ad;
CoInitialize(NULL);

IDesktopWallpaper* p;
if(SUCCEEDED(CoCreateInstance(__uuidof(DesktopWallpaper), 0, CLSCTX_LOCAL_SERVER, __uuidof(IDesktopWallpaper), (void**)&p))) {
    ad = p->SetWallpaper(NULL, x.c_str());
    p->Release();
}

CoUninitialize();
return 0;
}