旧VC项目dpiAware支持

起因

工作原因，需要维护一款VS2008 SP1开发的MFC项目，

发现WIN10高分辨率下显示模糊，不考虑升级VC版本情况下尝试解决

尝试

新版本VC中Manifest Tool>Input and Output内有一项dpiAware，应该是加了对应清单项，

尝试添加一下内容到hdpi.xml并Manifest Tool>Input and Output>Additional Manifest Files添加hdpi.xml

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0" xmlns:asmv3="urn:schemas-microsoft-com:asm.v3">
  <asmv3:application>
    <asmv3:windowsSettings xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">
      <dpiAware>true</dpiAware>
    </asmv3:windowsSettings>
  </asmv3:application>
</assembly>

报错 manifest authoring warning 81010002: Unrecognized Element "application" in namespace "urn:schemas-microsoft-com:asm.v3".

参考https://social.msdn.microsoft.com/Forums/vstudio/en-US/ab815aa4-bd4d-4ab2-8826-fa20b0816372/how-to-make-application-to-fit-dpi-setting

应该是mt.ex版本问题

解决

利用win8.1后新API，完美解决

SetProcessDpiAwareness

示例代码，兼容MinGW、VC，不区分C/C++

#define UNICODE
#include <windows.h>

static void _DpiNohelp()
{
	typedef HRESULT (WINAPI *FSetProcessDpiAwareness)(int value);
	HMODULE m = NULL; FARPROC proc = NULL;
	if(m = LoadLibrary(L"shcore.dll")) {
		if(proc = GetProcAddress(m, "SetProcessDpiAwareness"))
			((FSetProcessDpiAwareness)proc)(2);
		FreeLibrary(m);
	}
}

int main() {
	_DpiNohelp();
	MessageBox(0,0,0,0);
}