maginfo - An example of Windows Magnification API

README.md

maginfo

Display information of current magnification status.

This program is just an example of Microsoft Windows Magnification API.

Build and run

Type below commands on cygwin environment.

make
./maginfo

An example of result.

$ make
g++ -o maginfo maginfo.cpp `cygpath -S`/Magnification.dll
$ ./maginfo
MagInitialize: 1
maglevel     : 2.000000
offset       : 1080, 555
source rect  : -840, 555, 4280, 1635
target rect  : -3840, 0, 6400, 2160

Copyright

(c) 2018 Koichi OKADA. All rights reserves.

License

MIT licese.

maginfo.cpp

#include <cstdio>
#include <cstdlib>

#include <windows.h>
#include <magnification.h>

#ifdef __cplusplus
extern "C" {
#endif
BOOL MagInitialize(
);
BOOL MagGetFullscreenTransform(
  float *pMagLevel,
  int   *pxOffset,
  int   *pyOffset
);
BOOL MagGetInputTransform(
  BOOL   *pfEnabled,
  LPRECT pRectSource,
  LPRECT pRectDest
);
#ifdef __cplusplus
};
#endif

int main(int argc, char *argv[])
{
  BOOL fResult;

  fResult = MagInitialize();
  printf("MagInitialize: %d\n", fResult);
  
  float  magLevel;
  int    xOffset, yOffset;

  fResult = MagGetFullscreenTransform(&magLevel, &xOffset, &yOffset);
  if (fResult) {
    printf("maglevel     : %f\n", magLevel);
    printf("offset       : %d, %d\n", xOffset, yOffset);
  }
  
  BOOL fInputTransformEnabled;
  RECT rcSource;
  RECT rcTarget;

  fResult = MagGetInputTransform(&fInputTransformEnabled, &rcSource, &rcTarget);
  if (fResult) {
    printf("source rect  : %d, %d, %d, %d\n", rcSource.left, rcSource.top, rcSource.right, rcSource.bottom);
    printf("target rect  : %d, %d, %d, %d\n", rcTarget.left, rcTarget.top, rcTarget.right, rcTarget.bottom);
  }

  return EXIT_SUCCESS;
}

Makefile

.PHONY: all clean

TARGETS=maginfo
LIBS=`cygpath -S`/Magnification.dll

all: $(TARGETS)

maginfo: maginfo.cpp
	$(CXX) -o $@ $< $(LIBS)

clean:
	-rm $(TARGETS)