学步园

这个程序显示当前在线显示器的个数，当前主显示的分辨率，各个显示器的当前分辨率，各个显示器所支持的分辨率列表，以及各个显示器所支持的分辨率列表中某一个值。目前还没有包括设置分辨率的代码。它在Mac OS X 10.6的机器上编译成功运行。

/*<br /> * screenresolution.m<br /> *<br /> * Description:<br /> * It set/get current Online display resolutions.<br /> *<br /> * The version on webpage http://forums.macosxhints.com/showthread.php?t=59575<br /> * is before 10.6. This is for 10.6 and more functions.<br /> *<br /> * Author:<br /> * Tony Liu, June 2011<br /> *<br /> * Version History:<br /> * 2011-06-01: add -a option.<br /> *<br /> * COMPILE:<br /> * c++ setgetscreenres.m -framework ApplicationServices -o setgetscreenres -arch i386 -arch ppc<br /> * -mmacosx-version-min=10.3.9<br /> *<br /> */<br /> #include <ApplicationServices/ApplicationServices.h><br /> void ListDisplays(uint32_t displayTotal);<br /> void ListDisplayAllMode (CGDirectDisplayID displayID, int index);<br /> void PrintUsage(const char *argv[]);<br /> void PrintModeParms (double width, double height, double depth, double freq);<br /> int GetModeParms (CGDisplayModeRef mode, double *width, double *height, double *depth, double *freq);<br /> int GetDisplayParms(CGDirectDisplayID disp, double *width, double *height, double *depth, double *freq);<br /> uint32_t maxDisplays = 20;<br /> CGDirectDisplayID onlineDisplayIDs[20];<br /> uint32_t displayTotal;</p> <p>int main (int argc, const char * argv[])<br /> {<br /> double width, height, depth, freq;<br /> int displayNum;<br /> CGDirectDisplayID theDisplay;</p> <p> // 1. Getting system info.<br /> // CGError isErr=CGGetOnlineDisplayList (maxDisplays, onlineDisplayIDs, &displayTotal);<br /> if (CGGetOnlineDisplayList (maxDisplays, onlineDisplayIDs, &displayTotal) != kCGErrorSuccess) {<br /> printf("Error on getting online display List.");<br /> return -1;<br /> }</p> <p> if (argc == 1) {<br /> CGRect screenFrame = CGDisplayBounds(kCGDirectMainDisplay);<br /> CGSize screenSize = screenFrame.size;<br /> printf("%.0f %.0f/n", screenSize.width, screenSize.height);<br /> return 0;<br /> }</p> <p> if (argc == 2) {<br /> if (! strcmp(argv[1],"-l")) {<br /> ListDisplays(displayTotal);<br /> return 0;<br /> }<br /> else if (! strcmp(argv[1],"-?")) {<br /> PrintUsage(argv);<br /> return 0;<br /> }<br /> else if (! strcmp(argv[1],"-h")) {<br /> PrintUsage(argv);<br /> return 0;<br /> }<br /> else if (! strcmp(argv[1],"-a")) {<br /> printf("Total online displays: %d/n", displayTotal);<br /> return 0;<br /> }<br /> else if (displayNum = atoi(argv[1])) {<br /> if (displayNum <= displayTotal) {<br /> GetDisplayParms(onlineDisplayIDs[displayNum-1], &width, &height, &depth, &freq);<br /> PrintModeParms (width, height, depth, freq);<br /> return 0;<br /> }<br /> else {<br /> fprintf(stderr, "ERROR: display number out of bounds; displays on this mac: %d./n", displayTotal);<br /> return -1;<br /> }<br /> }<br /> }</p> <p> if (argc == 3) {<br /> if (! strcmp(argv[1],"-l")) {<br /> displayNum = atoi(argv[2]);<br /> if (displayNum <= displayTotal && displayNum > 0) {<br /> ListDisplayAllMode (onlineDisplayIDs[displayNum-1], 0);<br /> }<br /> return 0;<br /> }<br /> }<br /> if (argc == 4) {<br /> if (! strcmp(argv[1],"-l")) {<br /> displayNum = atoi(argv[2]);<br /> if (displayNum <= displayTotal && displayNum > 0) {<br /> ListDisplayAllMode (onlineDisplayIDs[displayNum-1], atoi(argv[3]));<br /> }<br /> return 0;<br /> }<br /> }<br /> if (argc == 4 && (displayNum = atoi(argv[1])) && (width = atoi(argv[2])) && (height = atoi(argv[3])) ) {<br /> if (displayNum <= displayTotal) {<br /> theDisplay= onlineDisplayIDs[displayNum-1];<br /> }<br /> else return -1;<br /> }<br /> else {<br /> if (argc != 3 || !(width = atoi(argv[1])) || !(height = atoi(argv[2])) ) {<br /> fprintf(stderr, "ERROR: syntax error./n", argv[0]);<br /> PrintUsage(argv);<br /> return -1;<br /> }<br /> theDisplay = CGMainDisplayID();<br /> }<br /> /* switchMode = CGDisplayBestModeForParameters(theDisplay, 32, h, v, NULL);</p> <p> if (! MyDisplaySwitchToMode(theDisplay, switchMode)) {<br /> fprintf(stderr, "Error changing resolution to %d %d/n", h, v);<br /> return 1;<br /> }<br /> */<br /> return 0;<br /> }</p> <p>void ListDisplays(uint32_t displayTotal)<br /> {<br /> uint32_t i;<br /> CGDisplayModeRef mode;<br /> double width, height, depth, freq;</p> <p> // CGDirectDisplayID mainDisplay = CGMainDisplayID();<br /> printf("Total Online Displays: %d/n", displayTotal);<br /> for (i = 0 ; i < displayTotal ; i++ ) {<br /> printf (" Display %d (id %d): ", i+1, onlineDisplayIDs[i]);<br /> GetDisplayParms(onlineDisplayIDs[i], &width, &height, &depth, &freq);<br /> if ( i = 0 ) printf(" (main) ");<br /> PrintModeParms (width, height, depth, freq);<br /> }<br /> }<br /> void ListDisplayAllMode (CGDirectDisplayID displayID, int iNum)<br /> {<br /> CFArrayRef modeList;<br /> CGDisplayModeRef mode;<br /> CFIndex index, count;<br /> double width, height, depth, freq;</p> <p> modeList = CGDisplayCopyAllDisplayModes (displayID, NULL);<br /> if (modeList == NULL) return;<br /> count = CFArrayGetCount (modeList);<br /> if (iNum <= 0) {<br /> for (index = 0; index < count; index++)<br /> {<br /> mode = (CGDisplayModeRef)CFArrayGetValueAtIndex (modeList, index);<br /> GetModeParms(mode, &width, &height, &depth, &freq);<br /> PrintModeParms (width, height, depth, freq);<br /> }<br /> }<br /> else if (iNum <= count) {<br /> mode = (CGDisplayModeRef)CFArrayGetValueAtIndex (modeList, iNum-1);<br /> GetModeParms(mode, &width, &height, &depth, &freq);<br /> PrintModeParms (width, height, depth, freq);<br /> }<br /> CFRelease(modeList);<br /> }<br /> void PrintModeParms (double width, double height, double depth, double freq)<br /> {<br /> printf ("%ld x %ld x %ld @ %ld Hz/n", (long int)width, (long int)height, (long int)depth, (long int)freq);<br /> }<br /> int GetModeParms (CGDisplayModeRef Mode, double *width, double *height, double *depth, double *freq)<br /> {<br /> *width = CGDisplayModeGetWidth (Mode);<br /> *height = CGDisplayModeGetHeight (Mode);<br /> *freq = CGDisplayModeGetRefreshRate (Mode);<br /> CFStringRef pixelEncoding = CGDisplayModeCopyPixelEncoding (Mode);<br /> *depth = 0;<br /> if (pixelEncoding = NULL) return -1;<br /> if (pixelEncoding = CFSTR(IO32BitDirectPixels))<br /> *depth = 32;<br /> else if (pixelEncoding = CFSTR(IO16BitDirectPixels))<br /> *depth = 16;<br /> else *depth = 8;<br /> CFRelease(pixelEncoding);<br /> return 0;<br /> }<br /> int GetDisplayParms(CGDirectDisplayID disp, double *width, double *height, double *depth, double *freq)<br /> {<br /> int iReturn=0;<br /> CGDisplayModeRef Mode = CGDisplayCopyDisplayMode(disp);<br /> iReturn = GetModeParms (Mode, width, height, depth, freq);<br /> CGDisplayModeRelease (Mode);<br /> return iReturn;<br /> }</p> <p>void PrintUsage(const char *argv[])<br /> {<br /> char *fname = strrchr(argv[0], '/')+1;<br /> printf("Screen Resolution v1.0, Mac OS X 10.6 or later, i386/n");<br /> printf("Copyright 2010 Tony Liu. All rights reserved. June 1, 2010/n");<br /> printf("/nUsage: %s -a/n", fname);<br /> printf(" %s [-l | 1..9 | -l 1 ..9 ] [ index ]/n", fname);<br /> printf(" %s -s [ 1..9 ] hor_res vert_res/n", fname);<br /> printf(" %s -? | -h this help./n/n", fname);<br /> printf(" -l list resolution, depth and refresh rate of all displays/n");<br /> printf(" 1..9 display # (default: main display)/n");<br /> printf(" -l 1-9 List all support for display #/n");<br /> printf(" -s Set mode./n");<br /> printf(" [1..9] Set the display mode./n");<br /> printf(" hor_res horizontal resolution/n");<br /> printf("vert_res vertical resolution/n/n");<br /> printf("Examples:/n");<br /> printf("%s -a get online display number/n", fname);<br /> printf("%s get current main diplay resolution/n", fname);<br /> printf("%s 3 get current resolution of third display/n", fname);<br /> printf("%s -l get resolution, bit depth and refresh rate of all displays/n", fname);<br /> printf("%s -l 1 get first display all supported mode/n", fname);<br /> printf("%s -l 1 2 get first display the second supported mode/n", fname);<br /> printf("%s -s 800 600 set resolution of main display to 800x600/n", fname);<br /> printf("%s -s 2 800 600 set resolution of secondary display to 800x600/n", fname);<br /> }

Tony Liu, June 2011

in Calgary