在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示:
}/P5>F<H[
!T,AdNa8 一、实现方法
8}e,%{q ul f2vD 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
6t'l(E + f~{}zGTM: #pragma data_seg("shareddata")
cbYLU\! HHOOK hHook =NULL; //钩子句柄
Q&'}BeUbm UINT nHookCount =0; //挂接的程序数目
JRMM? y static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
$,>@o=)_ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
q.4A(, static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
3]&o*Ib1`_ static int KeyCount =0;
evA/+F,& static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
qFQ8 #pragma data_seg()
l`-bFmpA u{N,Ib
8 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
;6ecrQMw& h].~# * DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
COzyG.R. WKz>
!E% BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
9`//^8G:= cKey,UCHAR cMask)
kql0J|P? {
YXurYwV BOOL bAdded=FALSE;
E m
6Qe for(int index=0;index<MAX_KEY;index++){
NcPgq?3p if(hCallWnd[index]==0){
Wo~vhv$E hCallWnd[index]=hWnd;
ig LMv+{ HotKey[index]=cKey;
"1`Oh<={b HotKeyMask[index]=cMask;
ph>7?3;t bAdded=TRUE;
Cxod[$8 KeyCount++;
"P-lSF?T break;
@H>@[+S# }
ml|W~-6l }
>odbOi+X return bAdded;
me6OPc;:! }
)}vNOE?X~ //删除热键
ps
.]N
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
vDl- "!G1 {
\#-W
< BOOL bRemoved=FALSE;
:0)3K7Q for(int index=0;index<MAX_KEY;index++){
[[d(jV=* if(hCallWnd[index]==hWnd){
@~c6qh if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
]u l$* hCallWnd[index]=NULL;
/2EHv.e` HotKey[index]=0;
1i:|3PA~ HotKeyMask[index]=0;
%CUGm$nH bRemoved=TRUE;
Uy
? KeyCount--;
;w|b0V6 break;
]lw|pvtd }
.h&k jD }
;$Y4xM`=m }
9Y>8=#.c return bRemoved;
kF;DBN }
HHX-1+L >>aq,pH 8d*/HF)h DLL中的钩子函数如下:
:ISMPe3' r78TE@d LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
P0H6mn* {
b"!Q2S~ BOOL bProcessed=FALSE;
"YdEE\ if(HC_ACTION==nCode)
t5)+&I2 {
-V,v9h^ if((lParam&0xc0000000)==0xc0000000){// 有键松开
Q+b
D}emd switch(wParam)
XNQAi (!GS {
,QzL)W7 case VK_MENU:
^Q*atU MaskBits&=~ALTBIT;
OO?]qZa1 break;
Xc"&0v%;# case VK_CONTROL:
[aI]y=v MaskBits&=~CTRLBIT;
s&\I=J. break;
B+^(ktZp@ case VK_SHIFT:
k+I}PuG MaskBits&=~SHIFTBIT;
!RyO\>:q break;
~4P%%b0,o default: //judge the key and send message
K=!Bh* break;
n,$IfC" }
[=B$5%A for(int index=0;index<MAX_KEY;index++){
V $z}
K if(hCallWnd[index]==NULL)
pV4Whq$ continue;
mUS_(0q if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
fDG0BNLY {
lds-T SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
xI>A6 bProcessed=TRUE;
&Tl
0Pf }
l;y7]DO }
>.dWjb6t }
vSi_t
K4 else if((lParam&0xc000ffff)==1){ //有键按下
'*\|;l#1 switch(wParam)
zC_<(4$-" {
s
w39\urf case VK_MENU:
>``MR%E:< MaskBits|=ALTBIT;
~QvqG{bFB break;
h?bb/T+' case VK_CONTROL:
p-1 3H0Kt MaskBits|=CTRLBIT;
o9cM{ya/> break;
5M9 I, case VK_SHIFT:
&WNf
M+ MaskBits|=SHIFTBIT;
JaB<EL-9r2 break;
Gmf B default: //judge the key and send message
u,}{I}x_ break;
~ek$C }
3;%5Yu for(int index=0;index<MAX_KEY;index++){
,t\* ZTt$ if(hCallWnd[index]==NULL)
"M|zv continue;
5]M>8ll if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
o.q/O)'V u {
:1Q!$ m SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
ChCrL[2 bProcessed=TRUE;
keB&Bjd& }
UQB"v3Z }
SM`w;?L:? }
_/wV;h~R if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
< yC for(int index=0;index<MAX_KEY;index++){
u|4$+QiD if(hCallWnd[index]==NULL)
;j4?>3 continue;
i;!H!-sM if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
n u'M
39{ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
XS$OyW_Q //lParam的意义可看MSDN中WM_KEYDOWN部分
Mi]L]-L }
'Ysx= }
R'S0 zp6 }
7"8hC return CallNextHookEx( hHook, nCode, wParam, lParam );
+[5.WC7J }
I4&::y^C qIld;v8w"g 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
-WYAN:s P;k0W>~k BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
B/`
!K BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
i86>] E*jP8 7g 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
=zyC-;r! 5Kkdo!z LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
n> ^[T[.S {
<Qxh)@
N if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
H@ t'~ZO {
_6wFba@>/n //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
}N*_KzPIa SaveBmp();
G#MdfKH return FALSE;
gdkwWoN. }
@-+Q#
Zz` …… //其它处理及默认处理
rL}YLR }
8=]Tr3 R58-wUto Y +Fljr* 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
;pnD0bH ij? 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
IEU^#=n C:Hoq( 二、编程步骤
Zfyo-Wk +"1NC\<* 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
{l |E:>Q2 T8^5=/ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
< P`u} 7U"[Gf 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
",!1m7[wF 4fe7U=# ;Y 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
Fy.\7CL>
6H'HxB4 5、 添加代码,编译运行程序。
/z}~zO Q:5KZm[ [ 三、程序代码
Ox@sI:CT 1bH;!J ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
JJ%ePgWT #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
X$yN_7|+ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
!H ~<
#if _MSC_VER > 1000
W8]lBh5~: #pragma once
&8z[`JW,T #endif // _MSC_VER > 1000
Z ,EvQ8i #ifndef __AFXWIN_H__
/ 4lvP #error include 'stdafx.h' before including this file for PCH
d'Zqaaf k% #endif
'7oA< R #include "resource.h" // main symbols
,u/aT5\_ class CHookApp : public CWinApp
435;Vns\n {
9ksE>[7 public:
2Y7)WPn CHookApp();
+=:#wzK@ // Overrides
Z.M,NR // ClassWizard generated virtual function overrides
EI^06q4x //{{AFX_VIRTUAL(CHookApp)
3mOtW%Hl public:
3YZs+d.;ib virtual BOOL InitInstance();
pZeE61c/ virtual int ExitInstance();
}X=[WCKU //}}AFX_VIRTUAL
?yj6CL(, //{{AFX_MSG(CHookApp)
I6Ce_|n
?k // NOTE - the ClassWizard will add and remove member functions here.
#es9d3~\ // DO NOT EDIT what you see in these blocks of generated code !
KjQR$- //}}AFX_MSG
PK"c4>q DECLARE_MESSAGE_MAP()
w08?DD]CDt };
G8;w{-{m LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
S*n@81Z BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
*f?4
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
="g*\s?r BOOL InitHotkey();
K#U<ib-v BOOL UnInit();
W]nSR RWco #endif
|<GDUwC_; VP6ZiQ| //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
vPD]hs #include "stdafx.h"
|M+<m">E #include "hook.h"
rs~wv(' #include <windowsx.h>
$5*WLG&AK #ifdef _DEBUG
Z"AQp _ #define new DEBUG_NEW
rSJ9v: #undef THIS_FILE
[B|MlrZ
static char THIS_FILE[] = __FILE__;
M{*Lp6h #endif
Uy$)%dYfq5 #define MAX_KEY 100
p1|f<SF') #define CTRLBIT 0x04
o9H^?Rut #define ALTBIT 0x02
qcN'e.A #define SHIFTBIT 0x01
IEzaK #pragma data_seg("shareddata")
MzL1Bh!M HHOOK hHook =NULL;
Cm\6tD UINT nHookCount =0;
'CN|'W)g7 static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
B4mR9HMh static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
QPfc(Z static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
D`VM6/iQR static int KeyCount =0;
ph-ATJ" static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
^Y
iJV7 #pragma data_seg()
%Jrt4sg[j- HINSTANCE hins;
Mv6-|O void VerifyWindow();
dS<C@( BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
L*~J%7 //{{AFX_MSG_MAP(CHookApp)
19j+lCSvH // NOTE - the ClassWizard will add and remove mapping macros here.
1+U // DO NOT EDIT what you see in these blocks of generated code!
m`FNIY //}}AFX_MSG_MAP
/, ! B2 END_MESSAGE_MAP()
kJ Mf oDU ;E CHookApp::CHookApp()
g2T -TG'd {
mzf+Cu:`v // TODO: add construction code here,
FG)$y[* // Place all significant initialization in InitInstance
!H}vu]R }
iV eC=^1 .3MIcj=p CHookApp theApp;
/\WQxe LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
<0PT"ij {
P`e!Z: BOOL bProcessed=FALSE;
6CMub0 if(HC_ACTION==nCode)
FGh]S-A {
H
`(exa:w if((lParam&0xc0000000)==0xc0000000){// Key up
$O dCL switch(wParam)
E,f>1meN= {
p^'3Odd|O case VK_MENU:
L_K=g_] MaskBits&=~ALTBIT;
}sOwp}FV8X break;
pe{;~-|6 case VK_CONTROL:
y})70w@+_ MaskBits&=~CTRLBIT;
g=$1cC+( break;
gw}Mw case VK_SHIFT:
~mR'Q-hi< MaskBits&=~SHIFTBIT;
Z>^pCc\lH break;
`2PLWo default: //judge the key and send message
Ed
,D8ND break;
|USX[jm\ }
1 %,a =,v for(int index=0;index<MAX_KEY;index++){
b/Xbs0q if(hCallWnd[index]==NULL)
MC{
2X continue;
44F`$.v96 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
]| +<P- {
91xB9k1zO SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
qvv2O1c"A bProcessed=TRUE;
;j)FnY=: - }
?2g`8["> }
C|o`k9I# }
tT79p.z B else if((lParam&0xc000ffff)==1){ //Key down
w#g#8o>' switch(wParam)
P';?YV0 {
@, W vvh case VK_MENU:
jvQ*t_L MaskBits|=ALTBIT;
H8'Z#"h break;
zD?K>I = case VK_CONTROL:
Iy6$7~ MaskBits|=CTRLBIT;
l}lIi8 break;
w &%~3Cz. case VK_SHIFT:
Y}vr>\ MaskBits|=SHIFTBIT;
"&%#!2 break;
NoJ`6MB default: //judge the key and send message
NmSo4Dg`U break;
}nMPSerE }
XZ5 /=z for(int index=0;index<MAX_KEY;index++)
qVs\Y3u( {
w$u3W*EoU^ if(hCallWnd[index]==NULL)
B.L]Rk\4 continue;
b? j< BvQ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
U2%.S&wS,e {
"5, SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
zdp/|"D! bProcessed=TRUE;
%:2+
o' }
% =BMZRn }
q/4 [3h }
E~a3r]V/ if(!bProcessed){
YLVPAODY for(int index=0;index<MAX_KEY;index++){
7k( Kq5w. if(hCallWnd[index]==NULL)
t&(PN%icD continue;
gy;+_'.j if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
:Pv*,qHE SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
/AQMFx4-5 }
oy;K_9\ }
ru7RcYRq }
Dxk+P!!K return CallNextHookEx( hHook, nCode, wParam, lParam );
1\r|g2Z
: }
9Fr3pRIJ >X51$wBL BOOL InitHotkey()
%b^OeWip {
MW+b;0U`# if(hHook!=NULL){
p^pOuy8 nHookCount++;
OGY"<YH6 return TRUE;
chEn |>~ }
41_SRh7N else
.n=Z:*JqQ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
kVD(Q~< if(hHook!=NULL)
%G?;!Lz nHookCount++;
;q1A*f\:# return (hHook!=NULL);
{Ions~cO) }
T_lsGu/ BOOL UnInit()
ymNnkFv {
mB\C?=_ if(nHookCount>1){
MBXBog7U nHookCount--;
~%2pp~1K return TRUE;
sIv)' }
jU5 }\oP@ BOOL unhooked = UnhookWindowsHookEx(hHook);
7^Yk`Z?|a if(unhooked==TRUE){
wm+})SOX9 nHookCount=0;
,p9i% i hHook=NULL;
I=!rbF;Z }
E{2Eoj;gq return unhooked;
+GAf O0 }
-$,%f? 3bNIZ#`|MB BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
VG>vn`x>a {
Ve/xnn]' BOOL bAdded=FALSE;
PTS]7 for(int index=0;index<MAX_KEY;index++){
8+Bu+|c%f if(hCallWnd[index]==0){
OK{xuX8u hCallWnd[index]=hWnd;
P(a.iu5 HotKey[index]=cKey;
w\19[U3 HotKeyMask[index]=cMask;
g5q$A9.Jl bAdded=TRUE;
U-^[lWn[@4 KeyCount++;
tM#lFmdd\P break;
E~kG2x{a }
_0 m\[t. }
PG]%Bv57 return bAdded;
X.TI>90{ }
nJbbzQ,e (S ^8UV BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Ou>vX[{ {
)}L??|# BOOL bRemoved=FALSE;
YQ0)5 } for(int index=0;index<MAX_KEY;index++){
|~
_'V " if(hCallWnd[index]==hWnd){
^bLRVp1 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
8_!.!Kde | hCallWnd[index]=NULL;
\` w4|T HotKey[index]=0;
z7-k`(l4 HotKeyMask[index]=0;
~xIjF1Z bRemoved=TRUE;
Hp|}~xjn KeyCount--;
v0 Ir#B,[H break;
Pe2w sR"_U }
dr<<! q / }
i7LJ&g/) }
cUO<. return bRemoved;
{ccIxL
/~ }
hwqbi "o =KT7nl void VerifyWindow()
wJlX4cT4YV {
}17.~ for(int i=0;i<MAX_KEY;i++){
gf+d!c(/ if(hCallWnd
!=NULL){ y3<Y?M4
if(!IsWindow(hCallWnd)){ dXn%lJ
hCallWnd=NULL; LC0d/hM
HotKey=0; |*mL1#bB
HotKeyMask=0; Xes|[ *Y!V
KeyCount--; &5t :H 8b
} -xD*tf*
} aV1lJ;0
} Hk7K`9
} -]:GL>b
7'NS9|
BOOL CHookApp::InitInstance() Q7bq
{ pA4*bO+
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ]h9!ei
[
hins=AfxGetInstanceHandle(); QjPj[c
InitHotkey(); $t-n'Qh^2
return CWinApp::InitInstance(); jtm?z c
} #?B%Ja%
;W
N:"C+a(
int CHookApp::ExitInstance() ~}DQT>7$
{
>`jU`bR@
VerifyWindow(); T5O _LCIws
UnInit(); s4H2/EC
return CWinApp::ExitInstance(); '!1$9o^$
} [/RM=4Nh5
!q"CV
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file l\$+7|W
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) nIfCF,6,
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 9PUes3"v
#if _MSC_VER > 1000 W@\ (nfD2
#pragma once MK}-<&v
#endif // _MSC_VER > 1000 NV r0M?`4
H0"= Vs,n
class CCaptureDlg : public CDialog "gW7<ilw
{
8%RI7Mg
// Construction D,ly#Nn
public: OVk~N)
BOOL bTray; uENdI2EY8y
BOOL bRegistered; H
g5++.Bp
BOOL RegisterHotkey(); e1q"AOV 6
UCHAR cKey; R \s!*)
UCHAR cMask; nF)uTk
void DeleteIcon(); [XlB<P=|>
void AddIcon(); "'Z- UV
UINT nCount; 0F;,O3Q
void SaveBmp(); 1f(DU4h
CCaptureDlg(CWnd* pParent = NULL); // standard constructor k6\^p;!Y
// Dialog Data C+NF9N
//{{AFX_DATA(CCaptureDlg) PKq-@F%X
enum { IDD = IDD_CAPTURE_DIALOG }; 8X&Ya =
CComboBox m_Key; "?.~/@
BOOL m_bControl; uM(UO,X
BOOL m_bAlt; "zZI S6j
BOOL m_bShift; 3,aN8F1;C
CString m_Path; y~<@x.
CString m_Number; dv
N<5~
//}}AFX_DATA 8Og3yFx[rt
// ClassWizard generated virtual function overrides pz doqAVI
//{{AFX_VIRTUAL(CCaptureDlg) sP$Ks#/
public: yy(A(}
virtual BOOL PreTranslateMessage(MSG* pMsg); bb=uF1
protected: F#+ .>!
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Ey&aBYR
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); HT`1E0G8)
//}}AFX_VIRTUAL oYM,8 K
// Implementation >E"9*:.^a
protected: u2sR.%2U<
HICON m_hIcon; rU#li0
>
// Generated message map functions mxqG-*ch-
//{{AFX_MSG(CCaptureDlg) UU@fkk
virtual BOOL OnInitDialog(); kB\kpW
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); XY+y}D
%
afx_msg void OnPaint(); 3 EYiQ`
afx_msg HCURSOR OnQueryDragIcon(); yqSY9EX7
virtual void OnCancel(); "2Op[~V
afx_msg void OnAbout(); p/]s)uYp$
afx_msg void OnBrowse(); %"Db?
afx_msg void OnChange(); d$;/T('
//}}AFX_MSG s\0K o1
DECLARE_MESSAGE_MAP() @%W]".*'}
}; Yr&Ka:
#endif @C.GKeM*
LAZVW</
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ]HvZ$
#include "stdafx.h" [6gO
#include "Capture.h" h{]#ag5`
#include "CaptureDlg.h" b1!@v+
#include <windowsx.h> uMFV%+I
#pragma comment(lib,"hook.lib") %%g-GyP
1
#ifdef _DEBUG {K7YTLWY
#define new DEBUG_NEW 0rzVy/Z(
#undef THIS_FILE _ 6:ww/
static char THIS_FILE[] = __FILE__; %cW;}Y[?P
#endif J4yt N3
#define IDM_SHELL WM_USER+1 QB1M3b
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Q_}/ Pn$1
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ; Zq/eiB
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; }e=e",eAT
class CAboutDlg : public CDialog 5()Fvae{k
{ MD'>jO;n
public: YU\Gj S~>&
CAboutDlg(); \{PNw F?
// Dialog Data FDLd&4Ex
//{{AFX_DATA(CAboutDlg) V-vlTgemwc
enum { IDD = IDD_ABOUTBOX }; <TjBd1
//}}AFX_DATA zk>h u<_
// ClassWizard generated virtual function overrides |< N frz
//{{AFX_VIRTUAL(CAboutDlg) NfF~dK|
protected: koH4~m{
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support d=e{]MG(
//}}AFX_VIRTUAL .C5@QKU
// Implementation T"W9YpZ
protected: %ejeyc
//{{AFX_MSG(CAboutDlg) 3Xdn62[&
//}}AFX_MSG R [9w
DECLARE_MESSAGE_MAP() ex phe+b
}; 7c::Qf[|
QHQj/)J8
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) %3,xaVN
{ ?~)Ak`=
//{{AFX_DATA_INIT(CAboutDlg) 0>Fqx{!heq
//}}AFX_DATA_INIT Vj!WaN_
} G?[-cNdk
BW71 s
void CAboutDlg::DoDataExchange(CDataExchange* pDX) .Z5[_'T
{ $Sb@zLi)
CDialog::DoDataExchange(pDX); ;c)! @GoA
//{{AFX_DATA_MAP(CAboutDlg) @+dHF0aXd
//}}AFX_DATA_MAP _0]QS4a][c
} uL>:tb
eycV@|6u*
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 'rx?hL3VW
//{{AFX_MSG_MAP(CAboutDlg) 8vJdf9pB*
// No message handlers m"-G6BKS
//}}AFX_MSG_MAP :r39wFi
END_MESSAGE_MAP() I*c;hfu
BkT-m'I?
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) (C~dkR?
: CDialog(CCaptureDlg::IDD, pParent) (rMZ
{ b"P&+c
//{{AFX_DATA_INIT(CCaptureDlg) `Qq/F]
m_bControl = FALSE; -kc(u1!
m_bAlt = FALSE; qC.i6IL
m_bShift = FALSE; 0Bu*g LY
m_Path = _T("c:\\"); NUu;tjt:
m_Number = _T("0 picture captured."); LR\zy8y]
nCount=0; :A*0 ]X;
bRegistered=FALSE; 6EP~F8Kd
bTray=FALSE; +:y&{K
//}}AFX_DATA_INIT qvTJ>FILT
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 9}XT'+`y
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); O0zi@2m?B
} VIYV92[
wWFW,3b
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ) MBS
{ "VQ|Ed
CDialog::DoDataExchange(pDX); MHNe>C-!q
//{{AFX_DATA_MAP(CCaptureDlg) t
2G1[j!
DDX_Control(pDX, IDC_KEY, m_Key); u#VweXyU
DDX_Check(pDX, IDC_CONTROL, m_bControl); 8GW ut=D
DDX_Check(pDX, IDC_ALT, m_bAlt); SW=aHM
DDX_Check(pDX, IDC_SHIFT, m_bShift); 1t%<5O;R
DDX_Text(pDX, IDC_PATH, m_Path); P#F_>GB
DDX_Text(pDX, IDC_NUMBER, m_Number); 7*g(@d
//}}AFX_DATA_MAP ?.j,Bq5At
} 2MT_#r_
*JS"(. '(
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) i^/DiWdyf
//{{AFX_MSG_MAP(CCaptureDlg) .h!9wGi`
ON_WM_SYSCOMMAND() r?afv.@L2
ON_WM_PAINT() <>&89E%j'
ON_WM_QUERYDRAGICON() XqX
I(q^
ON_BN_CLICKED(ID_ABOUT, OnAbout) s+N^PX3
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) }8
\|1@09
ON_BN_CLICKED(ID_CHANGE, OnChange) uegb;m
//}}AFX_MSG_MAP :Lc3a$qtx5
END_MESSAGE_MAP() F_ _H(}d
mf~Lzp
BOOL CCaptureDlg::OnInitDialog() X,&xhSzg?
{ {\lui eG
CDialog::OnInitDialog(); VlV)$z_
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); excrXx
ASSERT(IDM_ABOUTBOX < 0xF000); -g<cinNSp
CMenu* pSysMenu = GetSystemMenu(FALSE); w. vY(s
if (pSysMenu != NULL) ,0FwBK
{ =E;
#OZO
CString strAboutMenu; CHg]U l
strAboutMenu.LoadString(IDS_ABOUTBOX); Z3Gm
if (!strAboutMenu.IsEmpty()) o6:45
{ +&?'KZ+Z_v
pSysMenu->AppendMenu(MF_SEPARATOR); l&$*}yCK
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); H}(=?}+
} <
)Alb\Z
} (Q\\Gw
SetIcon(m_hIcon, TRUE); // Set big icon I=K[SY,]9
SetIcon(m_hIcon, FALSE); // Set small icon 4%%B0[Wo_O
m_Key.SetCurSel(0); Xv8fPP(
RegisterHotkey(); uH0#rgKt
CMenu* pMenu=GetSystemMenu(FALSE); E2-ojL[6
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); U* 4{"
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); &1oaZY w
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); o;*]1
return TRUE; // return TRUE unless you set the focus to a control %OuX`w=
} )2#vhMpdN
.r(^h/IF
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) h1E
PaL
{ FBcm;cjH
if ((nID & 0xFFF0) == IDM_ABOUTBOX) M,ppCHy/$
{ ?C
FS}v
CAboutDlg dlgAbout; l~ CZW*/
dlgAbout.DoModal(); I>d I[U
} Wf_CR(
else 4@ =
aa
{ 4VC/-.At
CDialog::OnSysCommand(nID, lParam); 9armirfV'P
} ;Sy/N||
} zU=YNrn
Th_Q
owk
void CCaptureDlg::OnPaint() oEN)Dw
o
{ p|b+I"M
if (IsIconic()) vT&j{2U7XW
{ ]DGGcUk7
CPaintDC dc(this); // device context for painting ~@[(U!G
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 9=H}yiJz
// Center icon in client rectangle r+SEw ;
int cxIcon = GetSystemMetrics(SM_CXICON); 'n>EEQyp'
int cyIcon = GetSystemMetrics(SM_CYICON); `D4oAx d9
CRect rect; Ck:#1-t8{
GetClientRect(&rect); OuMco+C
int x = (rect.Width() - cxIcon + 1) / 2; >7"$}5d
int y = (rect.Height() - cyIcon + 1) / 2; "^Y6ctw
// Draw the icon }7-7t{G
dc.DrawIcon(x, y, m_hIcon); `Fz\wPd
} &3jBE--
else ;HR 6X
{ VjC*(6<Gj
CDialog::OnPaint(); te4F"SEf
} /A0 [_
} U0!^m1U:
0`V3s]%iu
HCURSOR CCaptureDlg::OnQueryDragIcon() LG"c8Vv&)~
{ sg+ZQDF{x
return (HCURSOR) m_hIcon; \nrgAC-b
} =DGn,i9
44Q6vb?
void CCaptureDlg::OnCancel() '" ^ B&W
{ qPL^zM+
if(bTray) r9+E'\
DeleteIcon(); H&~5sEGa
CDialog::OnCancel(); ]z+*?cc
} ROP C |
PbbXi
void CCaptureDlg::OnAbout() |= tJ|
{ iTj"lA
CAboutDlg dlg; UY1JB^J$
dlg.DoModal(); -J-3_9I
} w906aV*s
tZdwy> ;
void CCaptureDlg::OnBrowse() /#:Rd^
{ R.91v4J
CString str; pQk=x T
BROWSEINFO bi; S`ax*`
char name[MAX_PATH]; hO5K\QnRL
ZeroMemory(&bi,sizeof(BROWSEINFO)); "PZYgl
bi.hwndOwner=GetSafeHwnd();
pESB Il
bi.pszDisplayName=name; {E;2&d
bi.lpszTitle="Select folder"; w> Tyk#7lw
bi.ulFlags=BIF_RETURNONLYFSDIRS; IXbdS9,>F
LPITEMIDLIST idl=SHBrowseForFolder(&bi); IlcNT_
5a8
if(idl==NULL) ?BWHr(J
return; M(_^'3u
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); BM|-GErE
str.ReleaseBuffer(); %'RI3gy
m_Path=str; fO[Rf_
if(str.GetAt(str.GetLength()-1)!='\\') Cf.pTYSl
m_Path+="\\"; NvQY7C
UpdateData(FALSE); HXD*zv@ *6
} #citwMW
l,imT$u
void CCaptureDlg::SaveBmp() #]5&mKi
{ y%{*uH}SL
CDC dc; qk_p}l-F1
dc.CreateDC("DISPLAY",NULL,NULL,NULL); %GVEY
CBitmap bm; [
c ~LY4:
int Width=GetSystemMetrics(SM_CXSCREEN); H.jLGe>
int Height=GetSystemMetrics(SM_CYSCREEN); :5TXA
bm.CreateCompatibleBitmap(&dc,Width,Height); 0ClX
CDC tdc; uAW*5 `[
tdc.CreateCompatibleDC(&dc); u5u0*c
CBitmap*pOld=tdc.SelectObject(&bm); ?l)}E
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ^Nd|+}
tdc.SelectObject(pOld); dH
^b)G4
BITMAP btm; tqff84
bm.GetBitmap(&btm); `f\5p+!<7R
DWORD size=btm.bmWidthBytes*btm.bmHeight; =XZF.ur
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); R=][>\7]}
BITMAPINFOHEADER bih; ;FV~q{
bih.biBitCount=btm.bmBitsPixel; !L&=?CX
bih.biClrImportant=0; Zp/qs
z(]
bih.biClrUsed=0; ^2&O3s
bih.biCompression=0; Uq9,(tV`6g
bih.biHeight=btm.bmHeight; wQF&GGYR
bih.biPlanes=1; <7vI h0
bih.biSize=sizeof(BITMAPINFOHEADER); ",MK'\E
bih.biSizeImage=size; aX>4Tw
bih.biWidth=btm.bmWidth; xTa4.ZXg
bih.biXPelsPerMeter=0; "o\6k"_c>
bih.biYPelsPerMeter=0; G=r(SJq
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Gk{
"O%AE
static int filecount=0; wc<2Uc
CString name; ]7#^])>
name.Format("pict%04d.bmp",filecount++); LV}UBao5n
name=m_Path+name; OhSt6&+
BITMAPFILEHEADER bfh; |% M{kA-
bfh.bfReserved1=bfh.bfReserved2=0; sYAG,r>h
bfh.bfType=((WORD)('M'<< 8)|'B'); bqZ?uvc3
bfh.bfSize=54+size; hW0,5>[7%
bfh.bfOffBits=54; Ff)~clIK '
CFile bf; H3
A]m~=3
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ C$N4
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); [oQ`HX1g
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); V\iIvBpWg
bf.WriteHuge(lpData,size); q;1VF;<"vH
bf.Close(); oiTMP`Y
nCount++; )z?&"I
} 902!M65[rG
GlobalFreePtr(lpData); USnD7I/b
if(nCount==1) `@u+u0
m_Number.Format("%d picture captured.",nCount); vSyi}5D
else _0DXQS\
m_Number.Format("%d pictures captured.",nCount); beN>5coP%A
UpdateData(FALSE); "6`)vgI~
} oW
yN:Qh
b6LC$"t0
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) E]HND.`*>
{ D+*uKldS;
if(pMsg -> message == WM_KEYDOWN) +WV_`Rx#
{ e 5WdK
if(pMsg -> wParam == VK_ESCAPE) >6.[i@RmWU
return TRUE; o+if%3
if(pMsg -> wParam == VK_RETURN) 4e(9@OLP
return TRUE; ;qMnO_E
} C*W.9
return CDialog::PreTranslateMessage(pMsg); 9sfB+]}h
} \dp9@y[^
yZj}EBa
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ;qT!fuN;
{ h+zkVRyA
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ .J<qfQ
SaveBmp(); w]o:c(x@
return FALSE; ^| FVc48{
} ~n8*@9[
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ }C`}wS3i
CMenu pop; NE;(..
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); X-G~/n-x
CMenu*pMenu=pop.GetSubMenu(0); ])$."g
pMenu->SetDefaultItem(ID_EXITICON); v)C:E 9!|
CPoint pt; yVmtsQ-}a
GetCursorPos(&pt); Dho[{xJ46
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); S2At$47v
if(id==ID_EXITICON) 7{kpx$:_
DeleteIcon(); QigoRB!z#9
else if(id==ID_EXIT) Ads<-.R
OnCancel(); ^;Hi/KvM\
return FALSE; .qb_/#Bas
} e~>p.l
LRESULT res= CDialog::WindowProc(message, wParam, lParam); | `)V^e_
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ,#'o)O#
AddIcon(); xnhDW7m
return res; }(g+: ]p-
} i)ES;b4
HYI1 o/}
void CCaptureDlg::AddIcon() bzj!d|T`
{ +>i<sk
NOTIFYICONDATA data; )bIK0h
data.cbSize=sizeof(NOTIFYICONDATA); S}v{^vR
CString tip; z`xz~9a<
tip.LoadString(IDS_ICONTIP); "j.oR}s9?#
data.hIcon=GetIcon(0); z2s|.M]&-D
data.hWnd=GetSafeHwnd(); <mo^Y k3
strcpy(data.szTip,tip); H(%] Os
data.uCallbackMessage=IDM_SHELL; {-v\&w
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; >jrz;r
data.uID=98; Vhbj.eX.)
Shell_NotifyIcon(NIM_ADD,&data); x^='pEt{
ShowWindow(SW_HIDE); LjH&f 4mY
bTray=TRUE; $D,
wO
} FkxhEat8
TReM8Vd
void CCaptureDlg::DeleteIcon() Z_^Kl76D
{ x3I%)@-Z
NOTIFYICONDATA data; \MFWK#W
data.cbSize=sizeof(NOTIFYICONDATA); ,Zcx3C:#
data.hWnd=GetSafeHwnd(); tXG4A$(2&
data.uID=98; ~Q$c!=
Shell_NotifyIcon(NIM_DELETE,&data); eRl?9
ShowWindow(SW_SHOW); hPqapz]HcP
SetForegroundWindow(); z)<pqN
ShowWindow(SW_SHOWNORMAL); 4|@FO}rK[l
bTray=FALSE; 0LHiOav
} Kz3h]/A.
j]F#p R}p
void CCaptureDlg::OnChange() #/B~G.+(
{ MMxoKL
RegisterHotkey(); IYM@(c@ld0
} `~aLSpB65
CK!pH{n+
BOOL CCaptureDlg::RegisterHotkey() !irX[,e
{ 9i2vWSga
UpdateData(); C_^R_
UCHAR mask=0; 7AtXG^lK
UCHAR key=0; #Zavdkw=d
if(m_bControl) <rwOI.W
l$
mask|=4; ;5oH6{7_Z
if(m_bAlt) dV2b)p4J
mask|=2; EhP&L?EL
if(m_bShift) W-]yKSob
mask|=1; |E_+*1l q.
key=Key_Table[m_Key.GetCurSel()]; r/q1&*T
if(bRegistered){ T`'3Cp$q
DeleteHotkey(GetSafeHwnd(),cKey,cMask); YZ%f7BUk
bRegistered=FALSE; *l?%
o{
} _"w!KNX>(~
cMask=mask; ++{+
#s6
cKey=key; T\e)Czz2-
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); WfjUJw5x"s
return bRegistered; o%~K4 M".
} x4m_(CtK
:J4C'N
四、小结 73sAZa|
BE2\? q-
本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。