Mac OS X:显示/设置分辨率的命令(源程序)
注：把变更现实分辨率的代码完成了。变更的时候，因为10.6不再提供诸如10.5之前的设置最佳分辨率的系统功能，所以需要自己编写。
设置和显示显示分辨率－源码
下面是一个设置和显示当前系统显示设备和分辨率的源码
如果有兴趣，大家给测试一下各自的环境下，它工作的情况。
几个概念：
Display: 每个当前连接到系统中的显示器
Main Display: 当前的主显示设备
Mode: 是每个显示设备和系统之间连接后，系统自动生成的管理它的一个内存对象，分辨率是其中的一个部分，每个显示设备可能有好多mode，这些mode组成一个列表。
编译步骤：
首先要安装了xcode开发环境，把下面的源码复制到一个文本编辑器中，比如TextEdit，然后使用文本方式保存，比如该源码的文件命是screenresolution.m，保存在你的Desktop上。再编译：在Terminal里面输入命令：
cd ~/Desktopc++ screenresolution.m -framework ApplicationServices -o screenresolution -arch i386
这样就在你的Desktop上生成了一个交screenresolution的程序.
具体使用，在Termianl里面运行：
[*]获得帮助：~/Desktop/screenresolution -h
[*]获得当前显示器的个数：~/Desktop/screenresolution -a
[*]当前主显示器的分辨率：~/Desktop/screenresolution
[*]获得当前第2个显示器的分辨率：~/Desktop/screenresolution 2
[*]获得主显示器支持的分辨率列表：~/Desktop/screenresolution -l
[*]获得第2个显示器支持的分辨率列表：~/Desktop/screenresolution -l 2
[*]设置当前主显示器的分辨率为800x600：~/Desktop/screenresolution -s 800 600
[*]设置第2个显示器的分辨率为800x600：~/Desktop/screenresolution -s 2 800 600
注意：
这个版本是为OS X 10.6以上版本做的. 在10.6系统上编译成功并运行成功；没有在10.5上编译过；10.6编译成功的执行命令，也没有在10.5系统上运行过－应该是无法运行的－谁有条件给测试一下。因为10.6把好多10.5里面的底层函数都改了。
已知的：
[*]没有考虑两个显示器mirro的状态
[*]设置分辨率尽量使用系统列出的所支持的分辨率，否则设置可能不成功。
其它的：
[*]测试过的给个回信。
[*]希望新功能的, 请说
[*]这个程序主要是用来控制远程电脑的分辨率。
源代码
/** screenresolution.m* * Description:* It set/get current Online display resolutions.** The version on webpage http://forums.macosxhints.com/showthread.php?t=59575* is before 10.6. This is for 10.6 and more functions.** Author:* Tony Liu, June 2011** 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;uint32_t displayTotal;char *sysFlags[]={"Unknown","Interlaced,", "Multi-Display,", "Not preset,", "Stretched,"};char flagString;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,"-l")) {if (argc == 2) {ListDisplays(displayTotal);return 0;}else if (argc == 3){displayNum = atoi(argv);if (displayNum <= displayTotal && displayNum > 0) {ListDisplayAllMode (onlineDisplayIDs, 0);}}return 0;}if (! strcmp(argv,"-a")) {printf("Total online displays: %d/n", displayTotal);return 0;}if ((! strcmp(argv,"-?")) || (! strcmp(argv,"-h"))) {PrintUsage(argv);return 0;}if (! strcmp(argv,"-s")) {if (argc == 4) {displayNum = 1; width = atoi(argv); height = atoi(argv);}else if (argc == 5) {displayNum = atoi(argv); width = atoi(argv); height = atoi(argv);}if (displayNum <= displayTotal)flag = GetBestDisplayMod(displayNum-1, width, height);return flag;}displayNum = atoi(argv);if (displayNum <= displayTotal) {GetDisplayParms(onlineDisplayIDs, &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);GetDisplayParms(onlineDisplayIDs, &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;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.mode=mode; mList.width=width; mList.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.width >= dwidth) {if (mList.height >= dheight) {mode = mList.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, '/')+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] /n", fname);printf(" %s -s [ 1..9 ] hor_res vert_res/n", fname);printf(" %s -? | -h this help./n/n", fname);printf(" -llist resolution, depth and refresh rate/n");printf(" 1..9display # (default: main display)/n");printf("-l 1-9List all support for the display #/n");printf(" -sSet mode./n");printf(" hor_reshorizontal resolution/n");printf("vert_resvertical 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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