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:
":(Cpf0
s5_1}KKCs 一、实现方法
!VJT"Ds_ g/n"N>L 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:
)[^:]}%r ThT.iD[ #pragma data_seg("shareddata")
m%BMd HHOOK hHook =NULL; //钩子句柄
jS5t?0 UINT nHookCount =0; //挂接的程序数目
f"}0j|Gg static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
;I0yQlx|U static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
@n~ND). static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
RN cI]oJ static int KeyCount =0;
N@%xLJF=N> static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
^qSf #pragma data_seg()
qB`0^V qqO10~Xc 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。
%>x0*T$$ v]d?6g 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:
I%VV4,I&pK b{yH4)O BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
U3VsMV*Y cKey,UCHAR cMask)
N?`GZ+5 {
//4p1^% BOOL bAdded=FALSE;
`"bRjC"f] for(int index=0;index<MAX_KEY;index++){
do:RPZ! if(hCallWnd[index]==0){
EP%
M8 hCallWnd[index]=hWnd;
Bt`r6v;\ HotKey[index]=cKey;
/M{)k_V HotKeyMask[index]=cMask;
7\Yq]:;O bAdded=TRUE;
e2VL/>y` KeyCount++;
N|^!"/ break;
u+, jAkr }
plz=G}Y }
XQJV.SVS return bAdded;
}gi`?58J6 }
@Z1?t%1 //删除热键
ua. 6?W) BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
H~1?MAX {
./5MsHfbxt BOOL bRemoved=FALSE;
16d{IGMz for(int index=0;index<MAX_KEY;index++){
JqH.QnKcv if(hCallWnd[index]==hWnd){
u0$5Fd&X if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Hf E;$ hCallWnd[index]=NULL;
;*85'WcS HotKey[index]=0;
S+E3;' H HotKeyMask[index]=0;
hGaYQgGq bRemoved=TRUE;
(vYf?+Kb KeyCount--;
lfI7&d* break;
a}+_Yo(Q }
aX%g+6t2 }
:;gwdZ }
6`{)p&9 return bRemoved;
cR@} }
s#8{:ko s\K-(`j} Snvj9Nr DLL中的钩子函数如下:
@tU>~y{E [$ Xu LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
T=)L5 Vuq< {
#7E&16Fk BOOL bProcessed=FALSE;
5tbiNm^X if(HC_ACTION==nCode)
y5opdIaT {
LnACce
?b if((lParam&0xc0000000)==0xc0000000){// 有键松开
BM}a?nnoc switch(wParam)
@o-evH;G {
~NJL S- case VK_MENU:
hJtghG6v MaskBits&=~ALTBIT;
epm8N / break;
E<.{
v\ case VK_CONTROL:
5Qe}v MaskBits&=~CTRLBIT;
61 HqBa break;
=F;^^VX case VK_SHIFT:
(l,YI"TzT MaskBits&=~SHIFTBIT;
xdSj+507 break;
iOA3x 8J default: //judge the key and send message
lVKF^-i break;
{gq:sj> }
Z{>Y':\?< for(int index=0;index<MAX_KEY;index++){
z8MpE if(hCallWnd[index]==NULL)
-ZMl[;OM continue;
<H(AS' if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
#
v/aI*Rl {
b9!J}hto, SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
#p^pvdvh3 bProcessed=TRUE;
U*#E aL }
A 5\"e^> }
L?pvz} }
gcY~_'&u else if((lParam&0xc000ffff)==1){ //有键按下
,@j&q switch(wParam)
), x3tTR {
=I*ZOE3n case VK_MENU:
B?>#cpWj MaskBits|=ALTBIT;
c[eGpZ] break;
Tlv|To case VK_CONTROL:
Ay. q) MaskBits|=CTRLBIT;
pLFL6\{g break;
@;-Un/'C;7 case VK_SHIFT:
b+fy&rk@- MaskBits|=SHIFTBIT;
>Sl:Z ,g; break;
Sv[_BP\^h default: //judge the key and send message
XcW3IO break;
Op)R3qt{ }
o3`gx for(int index=0;index<MAX_KEY;index++){
5L'@WB|{4u if(hCallWnd[index]==NULL)
fxCPGj continue;
KLM^O$= if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
I2!&=" 7@ {
pPqbD}p SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
hB1 iSm bProcessed=TRUE;
5nlyb,"^g }
"Kf~`0P }
AZm)$@e) }
s#CEhb if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
!haXO for(int index=0;index<MAX_KEY;index++){
5|H(N}S_ if(hCallWnd[index]==NULL)
t@mw f3, continue;
5+PBS)pJ]% if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
/VOST^z! SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
RAJ|#I1 //lParam的意义可看MSDN中WM_KEYDOWN部分
Kwmo)|7uPU }
;bu;t# }
+(hwe
jyC }
sjbC~Te-- return CallNextHookEx( hHook, nCode, wParam, lParam );
eT
\Q }
olW`.3f #hiDZ>nr 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:
%y~]3XWik h.0&)t\q" BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
0hr)tYW,G BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
LGue=Hkp g{.@|;d<p 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:
<\Dl#DH )=y6s^} LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
|Szr=[ {
~.=HN}E if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
rY+1s^F {
|0Ug~jKU //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
7o%|R2mL} SaveBmp();
{@`Uf;hPAX return FALSE;
=*G'.D /* }
<{~UKi …… //其它处理及默认处理
;&:Et }
n/|`Dz. =Qq^=3@h N`:bvr 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。
`'t;BXedz/ bao5^t} 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。
JHOBg{Wg 2:0Y'\nn 二、编程步骤
G(,~{N|| 6>^k9cJp 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";
m.X+sP-e jtJ8r5j 1 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
`Y$5g~3. $6+P&"8 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
= nN*9HRD |xC
TX 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
X64I~* vWga>IGM 5、 添加代码,编译运行程序。
ho=]'MS| 9E*K44L/V 三、程序代码
tXuxTVhoT {;~iq ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
ph+tk5k #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
&xT~;R^ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
ZX}" #if _MSC_VER > 1000
)4C6+63OD& #pragma once
-C]a2 #endif // _MSC_VER > 1000
~#Mx&mZ #ifndef __AFXWIN_H__
U~c;W@T #error include 'stdafx.h' before including this file for PCH
M)RQIl5 #endif
Q2PwO;E.`C #include "resource.h" // main symbols
S}I=i>QB class CHookApp : public CWinApp
hS/'b$# {
!~kzxY public:
$S ("-3 CHookApp();
=f|a?j,f~ // Overrides
<;"=ah7A // ClassWizard generated virtual function overrides
cC]1D*Bn //{{AFX_VIRTUAL(CHookApp)
CR=MjmH public:
%P6!vx:&^b virtual BOOL InitInstance();
N*-Z Jv virtual int ExitInstance();
+5\\wGo< //}}AFX_VIRTUAL
,_-*/- 7;8 //{{AFX_MSG(CHookApp)
d8I:F9 // NOTE - the ClassWizard will add and remove member functions here.
]jrxrUl // DO NOT EDIT what you see in these blocks of generated code !
fL:Fn"Nv //}}AFX_MSG
BS.6d}G4 DECLARE_MESSAGE_MAP()
.`RC,R`C };
%05a>Rf& LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
_L.yt5_ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
v%Xe)D BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
w\4m-Z{ BOOL InitHotkey();
!X_~|5. BOOL UnInit();
e@By@r&nql #endif
~(S4/d5 "|rqt.f2[ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
U]$3NIe #include "stdafx.h"
boon=;{p #include "hook.h"
PTqS L] #include <windowsx.h>
TR20{8" #ifdef _DEBUG
<ZdNPcT<s #define new DEBUG_NEW
}aIfIJ #undef THIS_FILE
c,ek]dTj static char THIS_FILE[] = __FILE__;
O,v$'r W #endif
*5)!y
d #define MAX_KEY 100
>$F]Ss)$ #define CTRLBIT 0x04
]vErF=[U, #define ALTBIT 0x02
';F][x 5j #define SHIFTBIT 0x01
1>{(dd?L #pragma data_seg("shareddata")
2N]s}/l HHOOK hHook =NULL;
{D#`+uw UINT nHookCount =0;
xx8na8 static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
V|`|CVFo] static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
Zv93cv static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
VV0$L=mo static int KeyCount =0;
S\(_"xJPp static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
+3CMfYsr8 #pragma data_seg()
7 >(ygu HINSTANCE hins;
sxtGl^,mU: void VerifyWindow();
1L7,x @w BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
qiN'Tuw9 //{{AFX_MSG_MAP(CHookApp)
2B;QS\e" // NOTE - the ClassWizard will add and remove mapping macros here.
?YO%]mTP // DO NOT EDIT what you see in these blocks of generated code!
iI7~9SCE //}}AFX_MSG_MAP
i2E7$[ END_MESSAGE_MAP()
e+TNG &_ 5c8x:
e@ CHookApp::CHookApp()
Q!v[b{]8 {
H2vEFn V // TODO: add construction code here,
o5uwa{v // Place all significant initialization in InitInstance
KMcP !N.I }
|zKcL3* g~b'}^J CHookApp theApp;
tHeLq*)) LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
>wwEa4
{
5JXLfYTUI BOOL bProcessed=FALSE;
(WvA9s{/ if(HC_ACTION==nCode)
aT #|mk=\ {
*Q?HaG|S if((lParam&0xc0000000)==0xc0000000){// Key up
dGe switch(wParam)
CS49M {
yk/XfwQ5 case VK_MENU:
"5K:"m MaskBits&=~ALTBIT;
{'%=tJ[YX break;
clNP9{ case VK_CONTROL:
jC%I]#!n MaskBits&=~CTRLBIT;
! ZEKvW break;
6s;x@g] case VK_SHIFT:
7Z_iQ1 MaskBits&=~SHIFTBIT;
Z/x~:u_ break;
[@;Z
xs default: //judge the key and send message
:|Cf$2k7 break;
9tO_hhEQ@ }
Ai;Pht9qi for(int index=0;index<MAX_KEY;index++){
_1ins;c52 if(hCallWnd[index]==NULL)
Qsa2iw{ continue;
\z
'noc if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
yr?\YKV)I {
566EMy| SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
-/X-.#}- bProcessed=TRUE;
2ip~qZNw>< }
9}N*(PI }
zPe . }
UpILr\3U else if((lParam&0xc000ffff)==1){ //Key down
Eh+lLtZ switch(wParam)
vq}V0-
< {
J']W7!p case VK_MENU:
5>
UgBA MaskBits|=ALTBIT;
E2MpMR break;
aH_&=/-Tz
case VK_CONTROL:
Dp8(L ]6 MaskBits|=CTRLBIT;
AO6;aT break;
P\JpE case VK_SHIFT:
0W)_5f& MaskBits|=SHIFTBIT;
y3#\mBiw break;
{<@~;iq default: //judge the key and send message
SDkN break;
IWkBq]Y }
})B)-8 for(int index=0;index<MAX_KEY;index++)
^:BRbp37i {
\MU4"sXw if(hCallWnd[index]==NULL)
PA E)3 continue;
&N EzKf if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
JsV#: {
S<TfvQ\,"@ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
4?Io@[7A) bProcessed=TRUE;
(&S v$L@ }
I ;_.tG }
Nn$$yUkMX }
08Q:1 ' if(!bProcessed){
-?uwlpm# for(int index=0;index<MAX_KEY;index++){
5Ai
Yx} if(hCallWnd[index]==NULL)
IH5thL@D continue;
sb1/4u/W if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
HwHI$IB SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
)~6974 }
m5S/T\,X }
U+KbvkX wj }
SNQ+ XtoO return CallNextHookEx( hHook, nCode, wParam, lParam );
Xe5J }
HN:{rAIfc }~7>S5 BOOL InitHotkey()
$hL0/T-m {
m2;%|QE( if(hHook!=NULL){
|:\h3M nHookCount++;
PSRGlxdO return TRUE;
JOMZ&c^ }
zVIzrz0 else
!`SR$dnE hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
B7#;tCf if(hHook!=NULL)
| c;S'36 nHookCount++;
L2 I/h`n" return (hHook!=NULL);
7Qo*u;fr }
]SQ_*$` BOOL UnInit()
@t_<oOI2 {
kz#DBh!& if(nHookCount>1){
!n7?w@2a' nHookCount--;
5+U~ZW0|+ return TRUE;
I0Vm^\8 }
:7R\"@V4 BOOL unhooked = UnhookWindowsHookEx(hHook);
sIyLW if(unhooked==TRUE){
U}UIbJD*= nHookCount=0;
? f%@8%px hHook=NULL;
(k[<>$hL* }
eN/Jb;W return unhooked;
hJ|z8Sy@1 }
lB-Njr })J]D~!p BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
wtZe\h {
F*a+&% Q BOOL bAdded=FALSE;
t<e?f{Q5 for(int index=0;index<MAX_KEY;index++){
l!oU9 if(hCallWnd[index]==0){
}Iu 6]?|' hCallWnd[index]=hWnd;
}RD,JgmV HotKey[index]=cKey;
6:e0?R^aD" HotKeyMask[index]=cMask;
}\1V;T bAdded=TRUE;
4-m}W;igu KeyCount++;
3,pRmdC break;
Q[}mH: w }
UPbG_ #"wZ }
2+|[e_ return bAdded;
6ds&n#n }
V482V#BP er 97&5 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
h322^24-2 {
7Q^t( BOOL bRemoved=FALSE;
poM VB{U for(int index=0;index<MAX_KEY;index++){
U7{,
* if(hCallWnd[index]==hWnd){
^f4qs if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
]+J]}C]\d hCallWnd[index]=NULL;
l!GAMK 6o HotKey[index]=0;
,\Cy'TSz HotKeyMask[index]=0;
6n>+cX>E bRemoved=TRUE;
kg_TXB KeyCount--;
yM>c**9 break;
r|
YuHm }
ZVI.s U }
`TAhW }
e\\ I, return bRemoved;
q'PA2a: }
yXlzImPn 'GAjx{gM void VerifyWindow()
,KZ_#9[> {
@*F
NWT6 for(int i=0;i<MAX_KEY;i++){
y%43w4 if(hCallWnd
!=NULL){ ,;UVQwY
if(!IsWindow(hCallWnd)){ *ozeoX'5D
hCallWnd=NULL; ZVeY`o(uE
HotKey=0; la
f b^
HotKeyMask=0; 94H 6`
KeyCount--; d'PjO-"g
} q4Q1Ib-<2
} {gzL}KL
} Uh*V>HA#
} E{h
e;,D!
BOOL CHookApp::InitInstance() 0&Zm3(}
{ o4tQ9X=}
AFX_MANAGE_STATE(AfxGetStaticModuleState()); eqYa`h@g^
hins=AfxGetInstanceHandle(); \
VJ3
InitHotkey(); )~rN{W<s`H
return CWinApp::InitInstance(); GBN^ *I
} ~fEgrF d
Fj|C+;Q.
int CHookApp::ExitInstance() e;!si>N
{ |6$6Za]:
VerifyWindow(); {73Z$w1%
UnInit(); Q!MS_
#O
return CWinApp::ExitInstance(); K`D>G<
} $GEY*uIOa
GoZr[=d
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file NEJxd%-
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) rD
fUTfv|Q
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ~gmj/PQ0
#if _MSC_VER > 1000 JuS#p5E #
#pragma once +wr2TT~
#endif // _MSC_VER > 1000 (;V6L{Rf>
BA53
class CCaptureDlg : public CDialog |I6\_K.=L
{ WM~@/J
// Construction /{^Qup
public: =rGjOb3+
BOOL bTray; vEk
jd#
BOOL bRegistered; &+Xj%x.]
BOOL RegisterHotkey(); c&J,O1){\
UCHAR cKey; 44b;]htv
UCHAR cMask; *C Me:a
void DeleteIcon(); ~+7q.XL$$K
void AddIcon(); .9PPWY;H
UINT nCount; RdRF~~R%
void SaveBmp(); =Z2Cg{z
CCaptureDlg(CWnd* pParent = NULL); // standard constructor Rra<MOR
// Dialog Data LW
8LD|@
//{{AFX_DATA(CCaptureDlg) f9?\Q'v8
enum { IDD = IDD_CAPTURE_DIALOG }; jIaAx_
CComboBox m_Key; Z~CL|=
BOOL m_bControl; s,)Z8H
BOOL m_bAlt; +QGZ2_vW
BOOL m_bShift; 2c
LIz@
CString m_Path; R#DnV[!\
CString m_Number; U@Y0 z.Y
//}}AFX_DATA '
cR||VX
// ClassWizard generated virtual function overrides +:+q,0~*]
//{{AFX_VIRTUAL(CCaptureDlg) ^9UKsy/q
public: HM/2/
/
virtual BOOL PreTranslateMessage(MSG* pMsg); DKp+ nq$
protected: >hQeu1 ~W
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support buu~#m1z
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 0[/>>
!ws
//}}AFX_VIRTUAL Y/?V%X
// Implementation Bq3" l%hI
protected: jhOQ)QE|
HICON m_hIcon; "AMbU68
// Generated message map functions _o`+c wc
//{{AFX_MSG(CCaptureDlg) ?A+-k4l
virtual BOOL OnInitDialog(); yY_Zq\
afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
p"\Z@c
afx_msg void OnPaint(); bz <f u
afx_msg HCURSOR OnQueryDragIcon(); <F{EZ Ii
virtual void OnCancel(); @(<C {
afx_msg void OnAbout(); ^{lcj
afx_msg void OnBrowse(); Ii FeO
afx_msg void OnChange(); PUZH[-:c
//}}AFX_MSG NitsUg@<
DECLARE_MESSAGE_MAP() Cdg/wRje
}; e:D8.h+&}
#endif *")Req
[|.IXdJ!
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file <[Oe.0SGu
#include "stdafx.h" ia6%>^
#include "Capture.h" P|*c7+q
#include "CaptureDlg.h" W;!OxOWZJ
#include <windowsx.h> ;5Spdi4w
#pragma comment(lib,"hook.lib") 0h=NbLr|S-
#ifdef _DEBUG 0}H7Xdkp
#define new DEBUG_NEW c&me=WD
#undef THIS_FILE z-ns@y(f@X
static char THIS_FILE[] = __FILE__; &m[ZpJ9
#endif ^,O%E;g^#
#define IDM_SHELL WM_USER+1 +?y ', Ir
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); = Lt)15
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 2t
7':X
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; XT+V> HI
class CAboutDlg : public CDialog 89hV{^
{ i7D[5!
public: wr>[Eo@%\
CAboutDlg(); AH-B/c5
// Dialog Data S\5%nz\
//{{AFX_DATA(CAboutDlg) ~;$,h ET
enum { IDD = IDD_ABOUTBOX }; 1seWR"
//}}AFX_DATA GYH{_Fq
// ClassWizard generated virtual function overrides +)$oy]
//{{AFX_VIRTUAL(CAboutDlg) rZ`+g7&^Fh
protected: ,Y9bXC8+dU
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ~P!\;S
//}}AFX_VIRTUAL [>--U)/
// Implementation e7tp4M9!%
protected: ^IW5c>;|
//{{AFX_MSG(CAboutDlg) r)<c
~\0 7
//}}AFX_MSG gOb"-;Zw
DECLARE_MESSAGE_MAP() M]|tXo$?
}; t^Z-0jH
kA/4W^]Ws
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) pNUe|b+P
{ b:B+x6M
//{{AFX_DATA_INIT(CAboutDlg) 4,EX2
//}}AFX_DATA_INIT ^Mvgm3hg
} Ln+;HorZ]
;Qn)~b~
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Q rBb!.r
{ L;RHshTy
CDialog::DoDataExchange(pDX); gpT~3c;l=
//{{AFX_DATA_MAP(CAboutDlg) Z=R 6?jU*n
//}}AFX_DATA_MAP wCQ.?*7-9Q
} At<D36,^"
l(A)G d5>
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) <=nOyT9
//{{AFX_MSG_MAP(CAboutDlg) 2o)8 'Lp
// No message handlers d)>b/0CZ
//}}AFX_MSG_MAP _p*a`,tK
END_MESSAGE_MAP() .d}yQ#5z
bS2g4]$'po
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) FZn1$_Svr
: CDialog(CCaptureDlg::IDD, pParent) <tBT?#C9+
{ l^}u S|c(
//{{AFX_DATA_INIT(CCaptureDlg) CuH4~6
m_bControl = FALSE; ?P-O4
m_bAlt = FALSE; )DhE~
m_bShift = FALSE; MZ&.{SY7
m_Path = _T("c:\\"); yf0v,]v[
m_Number = _T("0 picture captured."); auc:|?H~1n
nCount=0; }nX0h6+1
bRegistered=FALSE; Z{BK@Q4z
bTray=FALSE; M9A1
8d|
//}}AFX_DATA_INIT ,*U-o}{8C?
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 4K'U}W
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); %hN>o)
} 0?8>{!I
wW p7N
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ?g{[U0)
{ MKvmzLh$)
CDialog::DoDataExchange(pDX); $.pCoS]i
//{{AFX_DATA_MAP(CCaptureDlg) n}F$kyI
DDX_Control(pDX, IDC_KEY, m_Key); fo+s+Q|Y
DDX_Check(pDX, IDC_CONTROL, m_bControl); LwRzzgt
DDX_Check(pDX, IDC_ALT, m_bAlt); x}pH'S7
DDX_Check(pDX, IDC_SHIFT, m_bShift); G#e]J;
DDX_Text(pDX, IDC_PATH, m_Path); \fEG5/s}T
DDX_Text(pDX, IDC_NUMBER, m_Number); )W 5g-@
//}}AFX_DATA_MAP t`E5bWG
} ]o]`X$n
JyTETf,y
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) iB(?}SaAZ
//{{AFX_MSG_MAP(CCaptureDlg) w-ald?`
ON_WM_SYSCOMMAND() fcEm:jEZ*
ON_WM_PAINT() v~Dobk/n
ON_WM_QUERYDRAGICON() )L6
it
ON_BN_CLICKED(ID_ABOUT, OnAbout) *X$qgSW
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) EBW*v '
ON_BN_CLICKED(ID_CHANGE, OnChange) L!l?tM o
//}}AFX_MSG_MAP gh*k\0
END_MESSAGE_MAP() ]gVA6B?&9
B=K<k+{6"
BOOL CCaptureDlg::OnInitDialog() -e(<Jd_=
{ )s^gT]"N
CDialog::OnInitDialog(); Yb5@W/'
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); )cRHt:
ASSERT(IDM_ABOUTBOX < 0xF000); ?m2FN<S
CMenu* pSysMenu = GetSystemMenu(FALSE); {'A
15
if (pSysMenu != NULL) @xBb|/I
{ #&IrCq+
CString strAboutMenu;
yW1N&$n
strAboutMenu.LoadString(IDS_ABOUTBOX); i^jM9MAi
if (!strAboutMenu.IsEmpty()) O4f9n
{ Lf^
7|
pSysMenu->AppendMenu(MF_SEPARATOR); `Zo5!"'
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); jrN 5l1np
} #e-7LmO~
} paD[4L?4Hk
SetIcon(m_hIcon, TRUE); // Set big icon hs;|,r
SetIcon(m_hIcon, FALSE); // Set small icon d7b`X<=@s
m_Key.SetCurSel(0); NiVLx_<Pr'
RegisterHotkey(); !gLJBp
CMenu* pMenu=GetSystemMenu(FALSE); }0E@eL
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); D[@-`F
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); U&B(uk(2
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); )E=B;.FH
return TRUE; // return TRUE unless you set the focus to a control 2i!R>`
}
~m=Z>4M
I:=!,4S;
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ]wV\=m?z&
{ 2 N &B
if ((nID & 0xFFF0) == IDM_ABOUTBOX) vFJ4`Gjw(
{ HI D6h!
CAboutDlg dlgAbout; 8q9^
dlgAbout.DoModal(); `_Iyr3HAf
} 1@~%LV
else 8i`T?KB
{ OI)k0t^;D
CDialog::OnSysCommand(nID, lParam); 0K^@P#{hd
} D&mPYxXL
} F czia0@z
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void CCaptureDlg::OnPaint() 8cY5:plK
{ K[noW
if (IsIconic()) K6B6@
{ s!YX<V
CPaintDC dc(this); // device context for painting *B&i `tq
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ,:}VbQ:3I
// Center icon in client rectangle md{1Jn"
int cxIcon = GetSystemMetrics(SM_CXICON); 78xiT
int cyIcon = GetSystemMetrics(SM_CYICON); 6@^
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CRect rect; $?kTS1I(
GetClientRect(&rect); nSo.,72
int x = (rect.Width() - cxIcon + 1) / 2; L)|hjpQ
int y = (rect.Height() - cyIcon + 1) / 2; FN sSJU3ld
// Draw the icon U/U_q-z]
dc.DrawIcon(x, y, m_hIcon); olo9YrHn
} *yI( (G/
else _%rkN0-(a
{ r
H9}VA:h
CDialog::OnPaint(); T^|6{ S\
} iuEe#B;!
} 4yxf/X)
yP@#1KLa+
HCURSOR CCaptureDlg::OnQueryDragIcon() !h1|B7N
{ 3WkrG.$[b
return (HCURSOR) m_hIcon; S,+|A)\#
} * e,8o2C$
M#],#o*G
void CCaptureDlg::OnCancel() [e. `M{(TB
{ 2+(SR.oGq
if(bTray) fEK%)Z:0
DeleteIcon(); %kBrxf
CDialog::OnCancel(); +@Kq
} jw2hB[WR
S|RUc}(
void CCaptureDlg::OnAbout() =%FhY^-
{
_3KfY
CAboutDlg dlg; IU}g[OCu
dlg.DoModal(); ,8p-EH
} w~9Y=|YI7
[9CBTSr
void CCaptureDlg::OnBrowse() J0@#xw=+
{ ,tFLx#e#
CString str; GV)DLHiyxX
BROWSEINFO bi; N':d
T
char name[MAX_PATH]; tN;~.\TKg
ZeroMemory(&bi,sizeof(BROWSEINFO)); Z
+}#
Ic
bi.hwndOwner=GetSafeHwnd(); NTM.Vj
-_h
bi.pszDisplayName=name; Wc##.qU
bi.lpszTitle="Select folder"; ]mO7O+
bi.ulFlags=BIF_RETURNONLYFSDIRS; 8`b_,(\ N
LPITEMIDLIST idl=SHBrowseForFolder(&bi); _ =O;Lz$x
if(idl==NULL) `@ Ont+
return; olDzmy(=W*
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 9qJ:h-?M
str.ReleaseBuffer(); y7 W7270)
m_Path=str; PsS8b
if(str.GetAt(str.GetLength()-1)!='\\') zv\T ;_
m_Path+="\\"; ?O
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UpdateData(FALSE); t+WUz#i"
} 5@Xy) z
[ 3SbWwg
void CCaptureDlg::SaveBmp() l)
)Cvre+
{ R^4
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CDC dc; @JD!.3
dc.CreateDC("DISPLAY",NULL,NULL,NULL); H]f8W]"c[
CBitmap bm; M059"X="
int Width=GetSystemMetrics(SM_CXSCREEN); ~{yQsEU
int Height=GetSystemMetrics(SM_CYSCREEN); o:/ymeG
bm.CreateCompatibleBitmap(&dc,Width,Height); fJG!TQJ[Y
CDC tdc; { r8H5X
tdc.CreateCompatibleDC(&dc); oJ}$ /_
CBitmap*pOld=tdc.SelectObject(&bm); /u'M7R
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); b;(BMO,(
tdc.SelectObject(pOld); O#D
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BITMAP btm; #J
c)v0_
bm.GetBitmap(&btm); pB]+c%\
DWORD size=btm.bmWidthBytes*btm.bmHeight; Je~Ybh
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ]M9r<x*
BITMAPINFOHEADER bih; RZKczZGZg
bih.biBitCount=btm.bmBitsPixel; L)Ru]X`
bih.biClrImportant=0; gtb,}T=1
bih.biClrUsed=0; F1zsGlObu}
bih.biCompression=0; 3H/4$XJB
bih.biHeight=btm.bmHeight; 4^BHJOvs
bih.biPlanes=1; NA8$G|.?
bih.biSize=sizeof(BITMAPINFOHEADER); M6b6lhg
bih.biSizeImage=size; {BJn9B
bih.biWidth=btm.bmWidth; J{5&L &4
bih.biXPelsPerMeter=0; GCA?sFwo>
bih.biYPelsPerMeter=0; UzmD2AsO"
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); pSJc.j
static int filecount=0; a<`s'N1G
CString name; k39;7J
name.Format("pict%04d.bmp",filecount++); &!FWo@
name=m_Path+name; !+I!J
s"
BITMAPFILEHEADER bfh; P"mD73a
bfh.bfReserved1=bfh.bfReserved2=0; (
u}tUv3
bfh.bfType=((WORD)('M'<< 8)|'B'); tqe8:\1yK
bfh.bfSize=54+size; a)Ca:p
bfh.bfOffBits=54; 4m$Xjj`vE
CFile bf; %g*AGu`
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ o]*#|4-
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 09u@-
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); onAC;<w
bf.WriteHuge(lpData,size); Vnq&lz%QqC
bf.Close(); 4ky@rcD 1
nCount++; kFHtZS(
} "Dwaq*L
GlobalFreePtr(lpData); L2
tSKw~
if(nCount==1) PG/xX
H
m_Number.Format("%d picture captured.",nCount); d$` NApr
else ueazAsk3g
m_Number.Format("%d pictures captured.",nCount); RZ&T\;m,7
UpdateData(FALSE); v81H!c.*
} n$T'gX#5
<U()
*0
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) xT$9M"
{ ^8yhx-mgb
if(pMsg -> message == WM_KEYDOWN) \.<V~d?
{ 564)ha/^(
if(pMsg -> wParam == VK_ESCAPE) V<;w
return TRUE; r/vRaOg>X
if(pMsg -> wParam == VK_RETURN) iv/!c Mb
return TRUE; noa=wy
} sC.aT(meJ
return CDialog::PreTranslateMessage(pMsg); ,s,VOyr @F
} ,2YkQ/>
KDX34Fr1
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) \{ui{8+G
{ nZ 0rxx[V?
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ eD481r
SaveBmp(); L(2KC>GvA
return FALSE; %kJ_o*"
} JW4~Qwx
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ MdOQEWJ$|
CMenu pop; 5L}qL?S`x|
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); zLxO\R!d
CMenu*pMenu=pop.GetSubMenu(0); "NamP\hj
pMenu->SetDefaultItem(ID_EXITICON); hkq[xgX
CPoint pt; ZsPT!l,
GetCursorPos(&pt); t:G67^<3
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); C"P40VQoo
if(id==ID_EXITICON) ,:QzF"MV
DeleteIcon(); 'bXm,Ed
else if(id==ID_EXIT) 1c}
%_Z/
OnCancel(); A%pBvULH
return FALSE; #X(KW&;m
} (hn@+hc
LRESULT res= CDialog::WindowProc(message, wParam, lParam); crt
)}L8-
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Ok=RhoZZ
AddIcon(); CN$wlhs
return res; ljij/ C=
} DhwFD8tT
U]Vu8$W
void CCaptureDlg::AddIcon() [BpIzhy&}
{ Qf|=xV,F
NOTIFYICONDATA data; /{';\?w
data.cbSize=sizeof(NOTIFYICONDATA); 2,Og(_0>
CString tip; f@%H"8w!
tip.LoadString(IDS_ICONTIP); L/,W
data.hIcon=GetIcon(0); C]tHk)<|42
data.hWnd=GetSafeHwnd(); L"akV,w4p
strcpy(data.szTip,tip); y%21`y&Os
data.uCallbackMessage=IDM_SHELL; JEK6Ms;)A
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; L`$MOdF{_
data.uID=98; `H5n_km
Shell_NotifyIcon(NIM_ADD,&data); dcgz<m
ShowWindow(SW_HIDE); >+w(%;i;
bTray=TRUE; ,3t('SE
} k#I4^
S&A, Q'
void CCaptureDlg::DeleteIcon() Xq9n-;%zL
{ 4{h?!Z*
NOTIFYICONDATA data; 8 ]N
data.cbSize=sizeof(NOTIFYICONDATA); a3wTcp "r
data.hWnd=GetSafeHwnd(); Z^w}: {
data.uID=98; !}D!_z,)u
Shell_NotifyIcon(NIM_DELETE,&data); dsKEWZ
=
ShowWindow(SW_SHOW); _y q"F#,*
SetForegroundWindow(); :h 1-i
ShowWindow(SW_SHOWNORMAL); 0Dj<-n{9
bTray=FALSE; 5TqT`XTzm
} ~N+bD
E-NuCP%|c
void CCaptureDlg::OnChange() <n iq*
{ 5G@z l
RegisterHotkey(); M+X>!Os
} `c^ _5:euX
$d4^e&s
BOOL CCaptureDlg::RegisterHotkey() Ixhe86-:T
{ :xitV]1.
UpdateData(); $6~D 2K
UCHAR mask=0; b]v.jgD
UCHAR key=0; /lKgaq.
if(m_bControl) ^mLZT*
mask|=4; 28u)q2s^W|
if(m_bAlt) A7*<,]qT
mask|=2; v,N*vqWS
if(m_bShift) .z
u0GsU=
mask|=1; VjbRjn5LI
key=Key_Table[m_Key.GetCurSel()]; }ZMbTsm
if(bRegistered){ 8Yr_$5R
DeleteHotkey(GetSafeHwnd(),cKey,cMask); wf!?'*
bRegistered=FALSE; >y C1X|d~t
} +$KUy>
cMask=mask; Np4';H
cKey=key; Hmt}@
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); nYJ)M
AG@
return bRegistered; w(O/mUDX
} {{c/:FTEU
o+sb2:x
四、小结 fRp+-QvE
g@!mV)c97
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。