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    /* 
     * screenresolution.m 
     *  
     * Description: 
     *    It set/get current Online display resolutions. 
     * 
     * Author: 
     *    Tony Liu, Copy Right Tony Liu 2011,  All rights reserved. 
     * 
     * Version History: 
     *    2011-06-01: add -a option. 
     *    2011-06-08: Display adding flags and not display duplicate modes. 
     *    2011-06-09: Adding set the best fit resolution function. 
     * 
     * COMPILE: 
     *    c++ screenresolution.m -framework ApplicationServices -o screenresolution -arch i386 
     * 
     */
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@Tonyliu2ca
Tonyliu2ca committed Apr 22, 2013
1 parent 87e7d4c commit ac70bc2
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/*
* screenresolution.m
*
* Description:
* It set/get current Online display resolutions.
*
* Author:
* Tony Liu, Copy Right Tony Liu 2011, All rights reserved.
*
* Version History:
* 2011-06-01: add -a option.
* 2011-06-08: Display adding flags and not display duplicate modes.
* 2011-06-09: Adding set the best fit resolution function.
*
* COMPILE:
* c++ screenresolution.m -framework ApplicationServices -o screenresolution -arch i386
*
*/
#include <ApplicationServices/ApplicationServices.h>
struct sLIST {
double width, height;
CGDisplayModeRef mode;
};
typedef int (*compfn)(const void*, const void*);
void ListDisplays(uint32_t displayTotal);
void ListDisplayAllMode (CGDirectDisplayID displayID, int index);
void PrintUsage(const char *argv[]);
void PrintModeParms (double width, double height, double depth, double freq, int flag);
int GetModeParms (CGDisplayModeRef mode, double *width, double *height, double *depth, double *freq, int *flag);
int GetDisplayParms(CGDirectDisplayID disp, double *width, double *height, double *depth, double *freq, int *flag);
bool GetBestDisplayMod(CGDirectDisplayID display, double dwidth, double dheight);
int modecompare(struct sLIST *elem1, struct sLIST *elem2);
uint32_t maxDisplays = 20;
CGDirectDisplayID onlineDisplayIDs[20];
uint32_t displayTotal;
char *sysFlags[]={"Unknown","Interlaced,", "Multi-Display,", "Not preset,", "Stretched,"};
char flagString[200];

int main (int argc, const char * argv[])
{
double width, height, depth, freq;
int flag;
int displayNum;
CGDirectDisplayID theDisplay;

// 1. Getting system info.
if (CGGetOnlineDisplayList (maxDisplays, onlineDisplayIDs, &displayTotal) != kCGErrorSuccess) {
printf("Error on getting online display List.");
return -1;
}

if (argc == 1) {
CGRect screenFrame = CGDisplayBounds(kCGDirectMainDisplay);
CGSize screenSize = screenFrame.size;
printf("%.0f %.0f\n", screenSize.width, screenSize.height);
return 0;
}

if (! strcmp(argv[1],"-l")) {
if (argc == 2) {
ListDisplays(displayTotal);
return 0;
}
else if (argc == 3) {
displayNum = atoi(argv[2]);
if (displayNum <= displayTotal && displayNum > 0) {
ListDisplayAllMode (onlineDisplayIDs[displayNum-1], 0);
}
}
return 0;
}

if (! strcmp(argv[1],"-a")) {
printf("Total online displays: %d\n", displayTotal);
return 0;
}

if ((! strcmp(argv[1],"-?")) || (! strcmp(argv[1],"-h"))) {
PrintUsage(argv);
return 0;
}
if (! strcmp(argv[1],"-s")) {
if (argc == 4) {
displayNum = 1; width = atoi(argv[2]); height = atoi(argv[3]);
}
else if (argc == 5) {
displayNum = atoi(argv[2]); width = atoi(argv[3]); height = atoi(argv[4]);
}
if (displayNum <= displayTotal)
flag = GetBestDisplayMod(displayNum-1, width, height);
return flag;
}
displayNum = atoi(argv[1]);
if (displayNum <= displayTotal) {
GetDisplayParms(onlineDisplayIDs[displayNum-1], &width, &height, &depth, &freq, &flag);
PrintModeParms (width, height, depth, freq, flag);
return 0;
}
else {
fprintf(stderr, "ERROR: display number out of bounds; displays on this mac: %d.\n", displayTotal);
return -1;
}
return 0;
}

void ListDisplays(uint32_t displayTotal)
{
uint32_t i;
CGDisplayModeRef mode;
double width, height, depth, freq;
int flag;

// CGDirectDisplayID mainDisplay = CGMainDisplayID();
printf("Total Online Displays: %d\n", displayTotal);
for (i = 0 ; i < displayTotal ; i++ ) {
printf (" Display %d (id %d): ", i+1, onlineDisplayIDs[i]);
GetDisplayParms(onlineDisplayIDs[i], &width, &height, &depth, &freq, &flag);
if ( i = 0 ) printf(" (main) ");
PrintModeParms (width, height, depth, freq, flag);
}
}
void ListDisplayAllMode (CGDirectDisplayID displayID, int iNum)
{
CFArrayRef modeList;
CGDisplayModeRef mode;
CFIndex index, count;
double width, height, depth, freq;
int flag;
double width1, height1, depth1, freq1;
int flag1;

modeList = CGDisplayCopyAllDisplayModes (displayID, NULL);
if (modeList == NULL) return;
count = CFArrayGetCount (modeList);
width1=0; height1=0; depth1=0; freq1=0; flag1=0;
if (iNum <= 0) {
for (index = 0; index < count; index++)
{
mode = (CGDisplayModeRef)CFArrayGetValueAtIndex (modeList, index);
GetModeParms(mode, &width, &height, &depth, &freq, &flag);
PrintModeParms (width, height, depth, freq, flag);
}
}
else if (iNum <= count) {
mode = (CGDisplayModeRef)CFArrayGetValueAtIndex (modeList, iNum-1);
GetModeParms(mode, &width, &height, &depth, &freq, &flag);
PrintModeParms (width, height, depth, freq, flag);
}
CFRelease(modeList);
}
void PrintModeParms (double width, double height, double depth, double freq, int flag)
{
printf ("%ld x %ld x %ld @ %ld Hz, <%d>\n", (long int)width, (long int)height, (long int)depth, (long int)freq, flag);
}
int GetDisplayParms(CGDirectDisplayID disp, double *width, double *height, double *depth, double *freq, int *flag)
{
int iReturn=0;
CGDisplayModeRef Mode = CGDisplayCopyDisplayMode(disp);
iReturn = GetModeParms (Mode, width, height, depth, freq, flag);
CGDisplayModeRelease (Mode);
return iReturn;
}
int GetModeParms (CGDisplayModeRef Mode, double *width, double *height, double *depth, double *freq, int *sflag)
{
*width = CGDisplayModeGetWidth (Mode);
*height = CGDisplayModeGetHeight (Mode);
*freq = CGDisplayModeGetRefreshRate (Mode);
CFStringRef pixelEncoding = CGDisplayModeCopyPixelEncoding (Mode);
*depth = 0;
if (pixelEncoding = NULL) return -1;
if (pixelEncoding = CFSTR(IO32BitDirectPixels))
*depth = 32;
else if (pixelEncoding = CFSTR(IO16BitDirectPixels))
*depth = 16;
else *depth = 8;

*sflag = CGDisplayModeGetIOFlags(Mode);
CFRelease(pixelEncoding);
return 0;
}
bool GetBestDisplayMod(CGDirectDisplayID display, double dwidth, double dheight)
{
CFArrayRef modeList;
CGDisplayModeRef mode;
CFIndex index, count, sindex, scount=0;
double width, height, depth, freq;
double width1, height1, depth1, freq1;
int flag, flag1;
struct sLIST mList[100];
int ireturn=0;

modeList = CGDisplayCopyAllDisplayModes (display, NULL);
if (modeList == NULL) return;
count = CFArrayGetCount (modeList);
scount=0;
for (index = 0; index < count; index++)
{
mode = (CGDisplayModeRef)CFArrayGetValueAtIndex (modeList, index);
GetModeParms(mode, &width, &height, &depth, &freq, &flag);
// printf("........ scount=%d\n", (int)scount);
if (!((width==width1) && (height==height1) && (depth==depth1) && (freq==freq1) && (flag==flag1))) {
if (CGDisplayModeIsUsableForDesktopGUI(mode)) {
mList[scount].mode=mode; mList[scount].width=width; mList[scount].height=height;
width1=width; height1=height; depth1=depth; freq1=freq; flag1=flag;
scount++;
}
}
}
mode=NULL;
qsort ((void *) mList, scount, sizeof(struct sLIST), (compfn) modecompare);
for (index=0; index<scount; index++)
{
if (mList[index].width >= dwidth) {
if (mList[index].height >= dheight) {
mode = mList[index].mode;
break;
}
}
}

CGDisplayConfigRef pConfigRef;
CGConfigureOption option=kCGConfigurePermanently;
if ((mode != NULL) && (CGBeginDisplayConfiguration(&pConfigRef) == kCGErrorSuccess)) {
CGConfigureDisplayWithDisplayMode(pConfigRef, display, mode, NULL);
if (CGCompleteDisplayConfiguration (pConfigRef, option) !=kCGErrorSuccess) CGCancelDisplayConfiguration (pConfigRef);
}
else ireturn = -1;
CFRelease(modeList);
return ireturn;
}
int modecompare(struct sLIST *elem1, struct sLIST *elem2)
{
if ( elem1->width < elem2->width)
return -1;
else if (elem1->width > elem2->width) return 1;
if (elem1->height < elem2->height) return -1;
else if (elem1->height > elem2->height) return 1;
else return 0;
}
void PrintUsage(const char *argv[])
{
char *fname = strrchr(argv[0], '/')+1;
printf("Screen Resolution v1.0, Mac OS X 10.6 or later, i386\n");
printf("Copyright 2010 Tony Liu. All rights reserved. June 1, 2010\n");
printf("\nUsage:");
printf(" %s -a\n", fname);
printf(" %s [-l] [1..9]\n", fname);
printf(" %s -s [ 1..9 ] hor_res vert_res\n", fname);
printf(" %s -? | -h this help.\n\n", fname);
printf(" -l list resolution, depth and refresh rate\n");
printf(" 1..9 display # (default: main display)\n");
printf(" -l 1-9 List all support for the display #\n");
printf(" -s Set mode.\n");
printf(" hor_res horizontal resolution\n");
printf("vert_res vertical resolution\n\n");
printf("Examples:\n");
printf("%s -a get online display number\n", fname);
printf("%s get current main diplay resolution\n", fname);
printf("%s 3 get current resolution of third display\n", fname);
printf("%s -l get resolution, bit depth and refresh rate of all displays\n", fname);
printf("%s -l 1 get first display all supported mode\n", fname);
printf("%s -l 1 2 get first display the second supported mode\n", fname);
printf("%s -s 800 600 set resolution of main display to 800x600\n", fname);
printf("%s -s 2 800 600 set resolution of secondary display to 800x600\n", fname);
}

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