How to change the windows 10 wallpaper with C++? - c++

Question

I am looking to change the Windows desktop background wallpaper in C++ using the Windows API.
I have read the following posts on this topic:
How to change desktop background using VC++
SystemParametersInfo sets wallpaper completly black (using SPI_SETDESKWALLPAPER)
Problem:
When I execute the code, the desktop background changes to completely black like in the post above (yes, I did try the suggested fix in that post. No luck.)
Code:
#include <windows.h>
int main() {
std::string s = "C:\\picture.jpg";
SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, (PVOID*)s.c_str(), SPIF_SENDCHANGE);
return 0;
}
I have also tried just (void*) instead of (PVOID*) above and an L in front of the string. Nothing works so far.
SOLVED:
Changing SystemParametersInfo to SystemParametersInfoA (as suggested in the comment and answer) did the trick.

Answer 1

I believe you should use a wchar_t as input for SystemParametersInfo() instead of a string and also use SystemParametersInfoW().
The following code worked for me:
#include <windows.h>
#include <iostream>
int main() {
const wchar_t *path = L"C:\\image.png";
int result;
result = SystemParametersInfoW(SPI_SETDESKWALLPAPER, 0, (void *)path, SPIF_UPDATEINIFILE);
std::cout << result;
return 0;
}
Where result should return true if it manages to change the background.