舊VC項目dpiAware支持

原由

工做緣由，須要維護一款VS2008 SP1開發的MFC項目，
發現WIN10高分辨率下顯示模糊，不考慮升級VC版本狀況下嘗試解決

嘗試

新版本VC中Manifest Tool>Input and Output內有一項dpiAware，應該是加了對應清單項，
嘗試添加一下內容到hdpi.xml並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>

報錯manifest authoring warning 81010002: Unrecognized Element "application" in namespace "urn:schemas-microsoft-com:asm.v3".
參考https://social.msdn.microsoft.com/Forums/vstudio/en-US/ab815aa4-bd4d-4ab2-8826-fa20b0816372/how-to-make-application-to-fit-dpi-setting
應該是mt.ex版本問題

解決

利用win8.1後新API，完美解決
SetProcessDpiAwareness

示例代碼，兼容MinGW、VC，不區分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);
}