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When my computer has two monitors, which api should I use to modify the wallpaper? (I want to change the wallpaper of the second monitor separately)
With IDesktopWallpaper
(I had posted a sample in C# in this thread : How do I set the wallpaper / background image per Desktop / Monitor?)
Is there an easier way? I only know a little C++ code. C# does not understand..
Is there an easier way? I only know a little C++ code. C# does not understand..
No, but it is the same code in C++ (easier, not necessary to declare P/Invoke declarations)
I need to change the wallpaper for the second screen. Can you write a demonstration code? Thank you very much.
I need to change the wallpaper for the second screen.
But it is exactly the 3/4 lines of code I posted in C# (same lines in C++ with GetMonitorDevicePathAt then SetWallpaper)
I don't know much about interfaces...
You just use CoCreateInstance with CLSID_DesktopWallpaper
then the same code, like for example at Tell me more about the current image in my wallpaper slide show
I found this on the Internet, but it's not working.
#include <Windows.h>
#include <string>
#include "Shobjidl.h"
int main()
{
std::wstring x = L"C:\\Users\\strives\\Desktop\\ScreenShot\\panda.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;
}
Happy New Year from China (哈哈,我还是不会这个接口,新年快乐,来自中国的网友.)
It works for me on Windows 10 22H2
What does ad return ?
Actually,I don't use c++,IDesktopWallpaper* p; This line reports an error using the undefined type "IDesktopWallpaper"
Are you sure your Windows SDK is up to date ?
IDesktopWallpaper is defined in shobjidl_core.h included by Shobjidl.h, as the doc says.
The header file is OK, and the remaining two errors, I don't understand where the problem is
IDesktopWallpaper *pIDesktopWallpaper;
std::wstring x = L"F:\\桌面\\img19.jpg";
HRESULT ad;
CoInitialize(NULL);
if (SUCCEEDED(CoCreateInstance(CLSID_DesktopWallpaper, 0, CLSCTX_LOCAL_SERVER,CLSID_ShellDesktop, (void**)&pIDesktopWallpaper))) {
ad = pIDesktopWallpaper->SetWallpaper(NULL,x.c_str());
pIDesktopWallpaper->Release();
}
CoUninitialize();
The header file is OK, and the remaining two errors, I don't understand where the problem is
From similar problems on Google, are you using "precompiled headers" ?
Well, yes, since I don't know much about C++ and this programming software, I will ask someone else, this is a little troublesome
I see this code in this programming software, and I think I'm missing a line,How do I express this line?
@ const IID IID_IDesktopWallpaper = { 0x6332debf ,0x87b5 , 0x4670 ,{ 0x90,0xc0 , 0x5e,0x57,0xb4,0x08,0xa4,0x9e } };
Create a Console or a Windows Desktop Application with the VS Templates of Visual Studio
and the code will work with the necessary #include: