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:
)}/ ycTs
nE2w? 一、实现方法
bvxol\7 ; @d+NeS 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:
,EE,W0/zzM K~C6dy
#pragma data_seg("shareddata")
EO_:C9=d{ HHOOK hHook =NULL; //钩子句柄
-KuC31s_W UINT nHookCount =0; //挂接的程序数目
B"@3Q av3 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
,esryFRG static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
7CK3t/3D static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
B$Z%_j& static int KeyCount =0;
z154lY}K static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
u{6b>c|,X #pragma data_seg()
t-;zgW5mwF iFJ1}0<(x 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
R/_bk7o]H zF)&o} DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
69 >- /:+f5\"-b BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
DV8b<) cKey,UCHAR cMask)
+2KYtyI {
Ao0p=@Y BOOL bAdded=FALSE;
~$WBc qo for(int index=0;index<MAX_KEY;index++){
c\J?J>xz if(hCallWnd[index]==0){
!Qqi% hCallWnd[index]=hWnd;
eTeZ^G HotKey[index]=cKey;
ef Moi 'v HotKeyMask[index]=cMask;
l\HLlwYO bAdded=TRUE;
O<RLw)nzg KeyCount++;
u!B6';XY break;
b%-S'@ew }
y[C++Q }
A"V($:>U return bAdded;
/O^aFIxk }
'[Ue0r<jn //删除热键
c SV`?[a BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
7 K5D,"D;1 {
9GV1@'<Y] BOOL bRemoved=FALSE;
Qf>$'C(7!a for(int index=0;index<MAX_KEY;index++){
(2SmB`g if(hCallWnd[index]==hWnd){
\~r`2p-K if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Cwh*AKq( hCallWnd[index]=NULL;
or8`.hEHI HotKey[index]=0;
*%nV<}e^_= HotKeyMask[index]=0;
xpO'.xEs bRemoved=TRUE;
TEzMFu+V KeyCount--;
9sgyg3fv>5 break;
pGsk[. }
k6}M7&nY }
*K57($F }
TI<?h(*R_ return bRemoved;
&P0jRT3e#Y }
v>[U*E w
YEkWB^ &c|3v! DLL中的钩子函数如下:
4X1!t vOIzfwYG9 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
-K@mjN {
LwI A4$d BOOL bProcessed=FALSE;
O-=~Bn
_ if(HC_ACTION==nCode)
C)a;zU;9 {
cm'`u&S if((lParam&0xc0000000)==0xc0000000){// 有键松开
1Mtm?3Pt switch(wParam)
AW R {
F?Fs x)2k case VK_MENU:
N|N#- MaskBits&=~ALTBIT;
s2X<b
` break;
S#:yl>2 case VK_CONTROL:
TpSv7k T] MaskBits&=~CTRLBIT;
-r'/PbV0 break;
m-v0=+~& case VK_SHIFT:
v|7=IJ MaskBits&=~SHIFTBIT;
:;g7T -_q break;
4pJ #fkc^ default: //judge the key and send message
Bn<1zg5 break;
"8-;Dq'+ }
9K6G% for(int index=0;index<MAX_KEY;index++){
@~+W if(hCallWnd[index]==NULL)
QyEGK continue;
%0gcNk"= if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
}t FRl {
M}S1Zz%Ii1 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
om1@;u8u bProcessed=TRUE;
%FhUjHm }
nn?h;KzB }
y!kU0 }
%`# HGji) else if((lParam&0xc000ffff)==1){ //有键按下
]Uu :t switch(wParam)
9sI&&Jg {
i[#XYX'\ case VK_MENU:
d$gT,+|vu MaskBits|=ALTBIT;
#GbfFoE break;
}|j\QjH case VK_CONTROL:
_-R&A@ MaskBits|=CTRLBIT;
y[64O x break;
b;5&V_ case VK_SHIFT:
h6(\ tRd!\ MaskBits|=SHIFTBIT;
(rE.ft5$9 break;
~85>.o2RDW default: //judge the key and send message
ea3f`z break;
2gM/".|{ }
tYk!Y/O} for(int index=0;index<MAX_KEY;index++){
2N}U B=J if(hCallWnd[index]==NULL)
u= =`]\_@ continue;
1Uaj}=@M if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
5@-[[ $dk {
>3qfo2K0 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
GD-cP5$ bProcessed=TRUE;
?lPyapA] }
8JFvz(SK> }
4/?@ % }
ecsQshR if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
Re<@.d for(int index=0;index<MAX_KEY;index++){
|6O7_U#q if(hCallWnd[index]==NULL)
NE)Yd7m- continue;
5I6u 2k3 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
|\<L7|hb9 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Errs6 //lParam的意义可看MSDN中WM_KEYDOWN部分
crbph.0 }
/=K(5Xd }
G&z^AV }
q\n,/#'i~ return CallNextHookEx( hHook, nCode, wParam, lParam );
3Ow bU }
t8ZzBD!dP f6])M) 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:
8svN*`[ oB$c-!& BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
L:_GpZ_ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
)jPIBzMys ]k#iA9I 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
eD,'M o6/"IIso3 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
<5]ufv {
gjL+8Rk if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
0CpE,gg {
wec_=EqK0 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
rX}FhBl5 SaveBmp();
vs%d}]v return FALSE;
_O3X;U7rc }
0$B X8?Z …… //其它处理及默认处理
5rH?FQE }
sP~;i qk Pq(7lua7 .2{*>Dzi 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。
;-Ki`x.oJ ~Z:)Y* 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。
ufn%sA N#p%^GH 二、编程步骤
CxD=8X9m ^ u:bgwP 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";
_lBHZJ+ hlBMRx49 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
,}:}"cl *_sSM+S 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;
<%N*IE"q n/ZX$?tKAK 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
-A^o5s jRN>^Ur;g 5、 添加代码,编译运行程序。
f=IF_|@^S ):]5WHYg 三、程序代码
vyvb-oz;u L]*5cH ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
G$[Hm\V #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
gx.\&W b #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
Yq>K1E| #if _MSC_VER > 1000
lFN|)(X #pragma once
Y~k,AJ{ ^ #endif // _MSC_VER > 1000
&)izh) FA #ifndef __AFXWIN_H__
hplx s# #error include 'stdafx.h' before including this file for PCH
sQmJ3 (:HO #endif
sLd%m+*p #include "resource.h" // main symbols
vcC" class CHookApp : public CWinApp
69S*\'L {
0[f[6mm%m public:
:?j]W2+kR CHookApp();
Jb6)U] // Overrides
wv // ClassWizard generated virtual function overrides
1 T}jK^" //{{AFX_VIRTUAL(CHookApp)
e^k)756 public:
|pZ:5ta# virtual BOOL InitInstance();
ny}_^3 virtual int ExitInstance();
:7?n)=Tx //}}AFX_VIRTUAL
H5(:1 //{{AFX_MSG(CHookApp)
](^FGz // NOTE - the ClassWizard will add and remove member functions here.
&S39SV // DO NOT EDIT what you see in these blocks of generated code !
I23"DBR3 //}}AFX_MSG
~(`&hYE DECLARE_MESSAGE_MAP()
NQcNY= };
aMJJ|iiU LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
vDIsawbHD BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
QIfP%,LT BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
88VI
_< BOOL InitHotkey();
/*(&Dmt> BOOL UnInit();
D67z6jep( #endif
Md&K#)9,( Dxe]LES\] //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
u
s8.nL/ #include "stdafx.h"
Z>[n~{-,p #include "hook.h"
3X#Cep20a #include <windowsx.h>
>FS}{O2c #ifdef _DEBUG
E., #define new DEBUG_NEW
BP@V:z #undef THIS_FILE
0jt@|3 static char THIS_FILE[] = __FILE__;
dKY#Tl] #endif
?e\u_3-9 #define MAX_KEY 100
PPde!}T$ #define CTRLBIT 0x04
p]qz+Z/ #define ALTBIT 0x02
!ScEA= #define SHIFTBIT 0x01
p}e| E! #pragma data_seg("shareddata")
1'H!S%fS HHOOK hHook =NULL;
QT=i>X UINT nHookCount =0;
G!Yt.M0 static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
M5P3; static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
81!gp7c static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
+LlAGg]Z static int KeyCount =0;
I#'yy7J static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
+R_s(2vz #pragma data_seg()
_zkTx7H HINSTANCE hins;
*xN?5u% void VerifyWindow();
+F~B"a BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
:kC*<f\ //{{AFX_MSG_MAP(CHookApp)
!+DhH2;)F // NOTE - the ClassWizard will add and remove mapping macros here.
o(C;;C(*{ // DO NOT EDIT what you see in these blocks of generated code!
jW{bP_," //}}AFX_MSG_MAP
XePGOw))O END_MESSAGE_MAP()
eH~T PH rP#&WSLVj CHookApp::CHookApp()
hcz!f {
`O!yt // TODO: add construction code here,
bAld'z# // Place all significant initialization in InitInstance
mnx`e>0 }
;M"[dy`dY rH'|$~a CHookApp theApp;
B>[myx LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
^\r{72!y {
ikO9p|J BOOL bProcessed=FALSE;
@k\,XV`T~t if(HC_ACTION==nCode)
wRZS+^hx {
'wWuR@e#& if((lParam&0xc0000000)==0xc0000000){// Key up
hxt;sQAo{ switch(wParam)
q3`~uTzk {
q.j$]?PQ case VK_MENU:
C=bQ2t=Z MaskBits&=~ALTBIT;
U;M! jj break;
Tfx-h)oP3 case VK_CONTROL:
>*\yEH9" MaskBits&=~CTRLBIT;
C}ASVywc,1 break;
Qjd]BX; case VK_SHIFT:
Zy|u5J MaskBits&=~SHIFTBIT;
f ~bgZ break;
P0RtS1A default: //judge the key and send message
>Bu_NoM break;
wxN&k$`a }
S4rm K& for(int index=0;index<MAX_KEY;index++){
DQ&\k'"\ if(hCallWnd[index]==NULL)
Oc-ia)v1G continue;
T-]UAN"O if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
ZZYtaVF: {
cM\BEhh SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
mex@~VK bProcessed=TRUE;
P.jy7:dB, }
%/BBl$~ji }
221}xhn5 }
Htfq?\ FD else if((lParam&0xc000ffff)==1){ //Key down
"1`w>(= switch(wParam)
%-BwK {
aimf,(+ case VK_MENU:
Qwp2h"t` MaskBits|=ALTBIT;
m*\LO%s]E break;
Gyrc~m[$ case VK_CONTROL:
PR*EyM[T MaskBits|=CTRLBIT;
9<
S break;
_#uRKy<`N case VK_SHIFT:
jUDE)~h MaskBits|=SHIFTBIT;
%cJdVDW`L break;
q29d= default: //judge the key and send message
J4s`U/F break;
_Fe=:q }
Qz"//=hC|H for(int index=0;index<MAX_KEY;index++)
0#ON}l)> {
J(A+mYr{: if(hCallWnd[index]==NULL)
KFy|,@NI continue;
PZ#aq~>w if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
>U?#'e{qW {
L0w2qF SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
1:_}`x=hM bProcessed=TRUE;
rbs&A{i }
EfkBo5@ Qi }
d,Oe3?][0p }
~M1T
@Mv if(!bProcessed){
HGi%b5:<=M for(int index=0;index<MAX_KEY;index++){
t3C#$> if(hCallWnd[index]==NULL)
q^7=/d8 continue;
9$}>O] if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
:XTxrYt28 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
&Aym@G|k? }
[E"3?p }
nFe }
yo$A0Ti!w return CallNextHookEx( hHook, nCode, wParam, lParam );
-y[y.#o }
"{3MXAFe ;Wsl 'e/ BOOL InitHotkey()
]\]mwvLT {
ymT]ow6C if(hHook!=NULL){
EW3--33s nHookCount++;
8#4Gs Q" return TRUE;
Hl*#iUq }
"{d[V(lE" else
l{VJaZ $M hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
07:h4beT if(hHook!=NULL)
#-{ljjMQI nHookCount++;
G^SDB!/@J return (hHook!=NULL);
NE3/>5 }
'#~Sb8
BOOL UnInit()
z6h/C{ {
]BTISaL-R if(nHookCount>1){
u'gsIuRJ nHookCount--;
6UuM`eu return TRUE;
|uX&T`7?- }
}.=@^-JBA5 BOOL unhooked = UnhookWindowsHookEx(hHook);
AJ6O>Euq if(unhooked==TRUE){
l1%*LyD nHookCount=0;
ZmI#-[/ hHook=NULL;
QkLcs6)R }
NH1ak(zHW return unhooked;
y5Fgf3P@ju }
LmUR@
/VQ ,S~A]uH' BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
A5O; C {
jO`L:D/C BOOL bAdded=FALSE;
vkW;qt}yO for(int index=0;index<MAX_KEY;index++){
'C;KNc if(hCallWnd[index]==0){
r4iT
9D hCallWnd[index]=hWnd;
&yqk96z HotKey[index]=cKey;
z ^y -A? HotKeyMask[index]=cMask;
GkKoc v bAdded=TRUE;
FY]Et=p KeyCount++;
%;J$ h^ break;
N]GF>kf: }
cCIs~*D }
+!G)N~o return bAdded;
MW=rX>tE }
tMo=q7ig APU~y5vG ( BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
$]?M[sL\N7 {
W=2]!%3# BOOL bRemoved=FALSE;
;)sC{ "Jb for(int index=0;index<MAX_KEY;index++){
pwF])uf*{\ if(hCallWnd[index]==hWnd){
Hq,NOP if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
nQn=zbZ3 hCallWnd[index]=NULL;
9A}y^=!` HotKey[index]=0;
Xj:\B] v] HotKeyMask[index]=0;
'%a:L^a? bRemoved=TRUE;
0_t9;;y : KeyCount--;
aDE}'d1qo break;
^HHT>K-m }
8P2_/)| }
lO}I>yo}\ }
|8{\j*3 return bRemoved;
2 ,.8oa( }
4*UKR!sr R]o2_r7N"} void VerifyWindow()
q-e3;$ {
CZ(fP86e for(int i=0;i<MAX_KEY;i++){
=CaSd| if(hCallWnd
!=NULL){ 2F ~SH
if(!IsWindow(hCallWnd)){ ,rhNXx
hCallWnd=NULL; %B| Ca&
HotKey=0; <S0gIg`)
HotKeyMask=0; vQ{mEaH
KeyCount--; )xTu|V
} WTZuf9:
} |s!n7%|,7
} }IKU^0M9<T
} ZPHatC
$- GwNG
BOOL CHookApp::InitInstance() mf2Qu
{ cn'rBY
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ^YEMR C
hins=AfxGetInstanceHandle(); GEki34
n0
InitHotkey(); i\RB KF
return CWinApp::InitInstance(); Ul:M=8nE%
} &VVvZ@X;
[kI[qByf
int CHookApp::ExitInstance() ,4(m.P10
{ WX$AOnEv
VerifyWindow(); \K:?#07Wj4
UnInit(); "}uV=y
return CWinApp::ExitInstance(); Ul|htB<1:
} K!gocNOf
t5S!j2E
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file KU_""T
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) tCu9
D
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ D]K?ntS[*
#if _MSC_VER > 1000 S#\Cyn2(t
#pragma once 59(} D'lw>
#endif // _MSC_VER > 1000 >< Qp%yT
IpVtbDW
class CCaptureDlg : public CDialog U@)WTH6d
{ 7#9fcfL
// Construction Wk]E6yz6
public: /? Bu^KX
BOOL bTray; A&Cs
(e
BOOL bRegistered; E|=]k
BOOL RegisterHotkey(); i6E~]&~.v
UCHAR cKey;
;.~D!
UCHAR cMask; :) T#.(mR
void DeleteIcon(); wgZ6|)!0
void AddIcon(); /tq e:*
UINT nCount; $XrX(l5
void SaveBmp(); Y,X0x-
CCaptureDlg(CWnd* pParent = NULL); // standard constructor \~""<*Hz
// Dialog Data 6H|&HV(!R
//{{AFX_DATA(CCaptureDlg) OC`Mzf%.
enum { IDD = IDD_CAPTURE_DIALOG }; {z8wFL\
CComboBox m_Key; ]?hlpL
BOOL m_bControl; !]P=v`B.
BOOL m_bAlt; ='HLA-uT
BOOL m_bShift; g"D:zK)
CString m_Path; .H5^ N\V|
CString m_Number; 0Y*Ag,S
//}}AFX_DATA v0+$d\mP4<
// ClassWizard generated virtual function overrides [<#`@Kr
//{{AFX_VIRTUAL(CCaptureDlg) <rNz&;m}
public: f7 zGz
virtual BOOL PreTranslateMessage(MSG* pMsg); kfy|3KA3m
protected: 5+*CBG}
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 2Vg+Aly4D
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); kJ B u7
//}}AFX_VIRTUAL _;G|3>5u
// Implementation IHe?/oUL"b
protected: *GM.2``e
HICON m_hIcon; SCXtBZ`.G
// Generated message map functions Q% J!
//{{AFX_MSG(CCaptureDlg) <GoZ>
virtual BOOL OnInitDialog(); tnw6[U!rh=
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); CSMx]jbb
afx_msg void OnPaint(); [3(lk_t
afx_msg HCURSOR OnQueryDragIcon(); f`p"uLNo<
virtual void OnCancel(); a8Z{-=)
afx_msg void OnAbout(); WD#7Q&T(;
afx_msg void OnBrowse(); ks<+gL{K|i
afx_msg void OnChange(); ?/Z5%?6
//}}AFX_MSG (APGz,^9#
DECLARE_MESSAGE_MAP() ImI,q:[67
}; i7xBi:Si
#endif Bet?]4\_
EBplr ,
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file O)}5`0@L
#include "stdafx.h" =2, iNn
#include "Capture.h" -2y>X`1Y
#include "CaptureDlg.h" B%KfB
VC
#include <windowsx.h> 4NmLbM&C8
#pragma comment(lib,"hook.lib") ;d||u
#ifdef _DEBUG -@`!p
#define new DEBUG_NEW f_tC:T4a
#undef THIS_FILE AM4
:xz
static char THIS_FILE[] = __FILE__; :Pi="
#endif I sB=G-s
#define IDM_SHELL WM_USER+1 );ZxKGjc4
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); RMBPm*H
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); hdxq@%Vs
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 6Y}Bza
class CAboutDlg : public CDialog |&rxDf}W
{ rFYw6&;vOi
public: R"[U<^
CAboutDlg(); [!b=A:@
// Dialog Data s;YuB#Z
//{{AFX_DATA(CAboutDlg) gJuA*^
enum { IDD = IDD_ABOUTBOX }; T3^(I~03
//}}AFX_DATA CYN|
// ClassWizard generated virtual function overrides ~ ^)4*@i6
//{{AFX_VIRTUAL(CAboutDlg) 0uf)6(f
protected: 0-zIohSJdQ
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support xX{gm'3UYa
//}}AFX_VIRTUAL P}mn2Hs
// Implementation N(L?F):fT
protected: ?h'd\.j{
//{{AFX_MSG(CAboutDlg) FFID<Lf/2
//}}AFX_MSG ?-9It|R
DECLARE_MESSAGE_MAP() 0o-KjX?kP
}; qX!P:M
.06[*S
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) +[$ Q C*
{ nL&[R}@W
//{{AFX_DATA_INIT(CAboutDlg) wm_o(Z}
//}}AFX_DATA_INIT dzyp:\&9
} %PxJnMb?
@wO X</_g
void CAboutDlg::DoDataExchange(CDataExchange* pDX) CqbPUcK
{ OqA#4h4^
CDialog::DoDataExchange(pDX); ##qs{s^]
//{{AFX_DATA_MAP(CAboutDlg) :<>=,`vQD
//}}AFX_DATA_MAP ~>|o3&G{
} TTzvH;S
O{nM
yB
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) I]Jz[{~1
//{{AFX_MSG_MAP(CAboutDlg) =9#cf-?
// No message handlers R(N5K4J
//}}AFX_MSG_MAP X2hyxTOp
END_MESSAGE_MAP() uvj`r5ei
B]5G"4,
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 4Rev7Mc
: CDialog(CCaptureDlg::IDD, pParent) hQ}B?'>
{ N?krlR
//{{AFX_DATA_INIT(CCaptureDlg) @F0+t;
m_bControl = FALSE; U<mFwJ C]
m_bAlt = FALSE; x6B_5eF
m_bShift = FALSE; h[I~D`q)v
m_Path = _T("c:\\"); *S=zJyAO
m_Number = _T("0 picture captured."); O#S27.
nCount=0; )
v^;"q"
bRegistered=FALSE; qx<h rC0Z&
bTray=FALSE; \-~TW4dYe
//}}AFX_DATA_INIT Uk|(VR9
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 \dw*yZ^
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); QIZbAnn_
} \1b! I)T9
LHJjPf)F
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Z 361ko}
{ ZF6?N?t}h8
CDialog::DoDataExchange(pDX); HCTjFW>C
//{{AFX_DATA_MAP(CCaptureDlg) $M 1/74
DDX_Control(pDX, IDC_KEY, m_Key); T`.RP&2/d
DDX_Check(pDX, IDC_CONTROL, m_bControl); or{X{_X7
DDX_Check(pDX, IDC_ALT, m_bAlt); %>Y86>mVz
DDX_Check(pDX, IDC_SHIFT, m_bShift); RkuPMs
Hw;
DDX_Text(pDX, IDC_PATH, m_Path); U k*HRudt
DDX_Text(pDX, IDC_NUMBER, m_Number); Z
7s
(g]
//}}AFX_DATA_MAP Y]gb`z$?
} sM$gfFx
l2LUcI$ x
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) XF 8$D
//{{AFX_MSG_MAP(CCaptureDlg) YFY$iN~B,
ON_WM_SYSCOMMAND() ({_Dg43O'[
ON_WM_PAINT() ?E:L6,a
ON_WM_QUERYDRAGICON() 98AX=%8
ON_BN_CLICKED(ID_ABOUT, OnAbout) N]6M4j!
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) szx7CP`<8
ON_BN_CLICKED(ID_CHANGE, OnChange) &E&e5(&$
//}}AFX_MSG_MAP 8Qt'Y9|
END_MESSAGE_MAP() cy-Bhk0H
{@8TGHKv
BOOL CCaptureDlg::OnInitDialog() '8b/TL
{ $Q cr
CDialog::OnInitDialog();
B1!b@0^
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 0kdPr:B Q0
ASSERT(IDM_ABOUTBOX < 0xF000); N?mTAF'M
CMenu* pSysMenu = GetSystemMenu(FALSE); UBy<
vwnU
if (pSysMenu != NULL) PtT=HvP!k
{ W{!GL
CString strAboutMenu; ni$S@0
strAboutMenu.LoadString(IDS_ABOUTBOX); x{';0MkUV
if (!strAboutMenu.IsEmpty()) -1 Ok_h"
{ RiX~YLeM
pSysMenu->AppendMenu(MF_SEPARATOR); u79,+H@ep
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ZfYva(zP{Q
} ^ A`@g4!
} 6*n<emP
SetIcon(m_hIcon, TRUE); // Set big icon P:gN"f6
SetIcon(m_hIcon, FALSE); // Set small icon ;P#c!
m_Key.SetCurSel(0); xbv
RegisterHotkey(); ?-`G0 (
CMenu* pMenu=GetSystemMenu(FALSE); v9qgfdBS5
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); @GpM4>:
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); dE[nPtstb
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); |/R)FT#i
return TRUE; // return TRUE unless you set the focus to a control 5}uH;E)4
} ?4 fXCb]7
NlS/PWc6(
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ]
3@.)
{ XH?}0D(
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 4G4[IAu_
{ :7w^2/ZGo
CAboutDlg dlgAbout; (79y!&9p
dlgAbout.DoModal(); vxRy7:G"
} ^6E+l#
else ?zD?-
{ y,D4b6
CDialog::OnSysCommand(nID, lParam); 6:v$g
} i,Q{Z@,
} ymxYE#q
m.}Yn,
void CCaptureDlg::OnPaint() 5g{F-
{ :bhpYEUMx
if (IsIconic()) e /4{pe+,
{ c3>#.NP_
CPaintDC dc(this); // device context for painting B4 cm_YGE
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); "|6#n34
// Center icon in client rectangle Xo{|m[,
int cxIcon = GetSystemMetrics(SM_CXICON); Gs% cod
int cyIcon = GetSystemMetrics(SM_CYICON); q@}eYQ=P|e
CRect rect; !e}LB%zf
GetClientRect(&rect); .1[[Y}
int x = (rect.Width() - cxIcon + 1) / 2; ;;2Yfn'`9
int y = (rect.Height() - cyIcon + 1) / 2; RvQl{aL
// Draw the icon AI|8E8h+D
dc.DrawIcon(x, y, m_hIcon); o6PDCaT7
} Tjfg[Z/x
else LyRU2A
{ $cxulcay=
CDialog::OnPaint(); -Tw96 dv
} #Tjv(O[&
} %)Pn<! L
[=63xPxs.
HCURSOR CCaptureDlg::OnQueryDragIcon() }T}9AQ}|
{ <9]9;
return (HCURSOR) m_hIcon; I'_u4
} \UdHN=A&
UUf-G0/P
void CCaptureDlg::OnCancel() nnV(MB4z1
{ gRk%ObJGqm
if(bTray) |-W7n'n
DeleteIcon(); OKo39 A\fu
CDialog::OnCancel(); G/2| *H
} i,{'}B
ZZ<uiN$
void CCaptureDlg::OnAbout() 5w\>Whbd
{ ;<JyA3i^V,
CAboutDlg dlg;
$rAHtr
dlg.DoModal(); &vf%E@<
} |hp_<F9.
\BV$p2m5-
void CCaptureDlg::OnBrowse() 8Rgvb3u
{ (o!v,=# 6{
CString str; oA^aT:o +
BROWSEINFO bi; SIBNU3;DL
char name[MAX_PATH]; bOt6q/f
ZeroMemory(&bi,sizeof(BROWSEINFO)); 7gL N7_2
bi.hwndOwner=GetSafeHwnd(); :
"|M
bi.pszDisplayName=name; V'XmMn)!
bi.lpszTitle="Select folder"; I.f)rMl+h
bi.ulFlags=BIF_RETURNONLYFSDIRS; +J^-B}v
LPITEMIDLIST idl=SHBrowseForFolder(&bi); z$VA]tI(
if(idl==NULL) *?zyF@K{%
return; 9aED6
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); `uO(#au,U
str.ReleaseBuffer(); IA\CBwiLj
m_Path=str; X}~5%B(
if(str.GetAt(str.GetLength()-1)!='\\') \
2$nFr?0
m_Path+="\\"; +bG^SH2ke
UpdateData(FALSE); s~@4
} ~w&P]L\dB
7IrbwAGZ3
void CCaptureDlg::SaveBmp() ;b(*Bh<
{ l(EDe
CDC dc; F__j]}?
dc.CreateDC("DISPLAY",NULL,NULL,NULL); J33enQd
CBitmap bm; 3;wAm/Z:Q
int Width=GetSystemMetrics(SM_CXSCREEN); }r}$8M+1
int Height=GetSystemMetrics(SM_CYSCREEN); kEH(\3,l
bm.CreateCompatibleBitmap(&dc,Width,Height); h|=<I)}z
CDC tdc; X=i^[?C
tdc.CreateCompatibleDC(&dc); e/pZLj]M
CBitmap*pOld=tdc.SelectObject(&bm); tevB2'3^
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); i'GBj,:
tdc.SelectObject(pOld); [jPUAr}
BITMAP btm; `D0>L'
bm.GetBitmap(&btm); jE
/pba4R
DWORD size=btm.bmWidthBytes*btm.bmHeight; "f/Su(6{0
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 5'JONw'\
BITMAPINFOHEADER bih; Qi
3di
bih.biBitCount=btm.bmBitsPixel; ^x Wu7q
bih.biClrImportant=0; }@kD&2
bih.biClrUsed=0; FKTdQg|NZ
bih.biCompression=0; J}Q4.1WG$
bih.biHeight=btm.bmHeight; *hhPCYOm
bih.biPlanes=1; LL|uMe"Jb
bih.biSize=sizeof(BITMAPINFOHEADER); DrfOz#a0Uu
bih.biSizeImage=size; j.? '*?P
bih.biWidth=btm.bmWidth; AY{-Hf&
bih.biXPelsPerMeter=0; 9~bl
bih.biYPelsPerMeter=0; b51{sL
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 9n#Q1Xq
static int filecount=0; G~SgI>Q
CString name; [^rT: %Z
name.Format("pict%04d.bmp",filecount++); X@;o<2^
name=m_Path+name; v8
Q/DJ~
BITMAPFILEHEADER bfh; MIblx
bfh.bfReserved1=bfh.bfReserved2=0; ^6tcB* #A
bfh.bfType=((WORD)('M'<< 8)|'B'); c-|~ABtEpX
bfh.bfSize=54+size; 8VbHZ9Q
bfh.bfOffBits=54; fOE8{O^W
CFile bf;
X2X.&^
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 5H (CP
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); I9sx*'
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); |T!^&t
bf.WriteHuge(lpData,size); 9ANC,+0p
bf.Close(); aq'dC=y
nCount++; ikr|P&e#u
} koiQJdK
GlobalFreePtr(lpData); b)7uz>I
if(nCount==1) j"FX ?|4
m_Number.Format("%d picture captured.",nCount); pF)}< <C
else <78]OZ] Z
m_Number.Format("%d pictures captured.",nCount); X67.%>#3
UpdateData(FALSE); ]}4{|& e
} wv.FL$f[@
udRum7XW3
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) u/`jb2eEU:
{ >C6wm^bl
if(pMsg -> message == WM_KEYDOWN) 0FA
N9u2
{ $D`~X`
if(pMsg -> wParam == VK_ESCAPE) (&n4^tJ+_
return TRUE; ls5s}X
if(pMsg -> wParam == VK_RETURN) L0v& m
return TRUE; \,:3bY_d
} ^%)H;
return CDialog::PreTranslateMessage(pMsg); r?{$k3Vl
} 3Uzb]D~u
4)'8fi
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 2_^{Vez@I
{ 7@[3]c<=
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ bjgf8427I
SaveBmp(); 4nC`DJ;V
return FALSE; KfC8~{O-
} xM ]IU
<
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 4vri=P 2%
CMenu pop; .C]V==z`[4
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ^P5+ _P
CMenu*pMenu=pop.GetSubMenu(0); ]<9=%m
pMenu->SetDefaultItem(ID_EXITICON); q#fj?`k
CPoint pt; Au+SCj
GetCursorPos(&pt); X!+#1NPM
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); %s.hqr,I
if(id==ID_EXITICON) b;wf7~a*
DeleteIcon(); '4gi*8Y
else if(id==ID_EXIT) wzX
1!?
OnCancel(); %O5
k+~9
return FALSE; yo)a_rY
} J(BtGGU'
LRESULT res= CDialog::WindowProc(message, wParam, lParam); :D-xa!7
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) . &dh7`l
AddIcon(); K".\QF,:
return res; EJ$-
} I]qml2
!olvP*c"
void CCaptureDlg::AddIcon() @(XX68
{ wRgh`Hc\}
NOTIFYICONDATA data; -4P2 2
data.cbSize=sizeof(NOTIFYICONDATA); al/3$0#U
CString tip; V K/;ohTTP
tip.LoadString(IDS_ICONTIP); "%O,*t
data.hIcon=GetIcon(0); =^.f)
data.hWnd=GetSafeHwnd(); <ex,@{n4
strcpy(data.szTip,tip); lO482l_t
data.uCallbackMessage=IDM_SHELL; |yE_M-Nc
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; qXPT1%+)y
data.uID=98; \cq
gCab/2
Shell_NotifyIcon(NIM_ADD,&data); neQ2k=ao
ShowWindow(SW_HIDE); 4:$?u}9[:[
bTray=TRUE; &KfRZ`9H
} &5&C
%N\pfZ2\
void CCaptureDlg::DeleteIcon() ?!H<V@a
{ +MG(YP/l
NOTIFYICONDATA data; lQs|B '
data.cbSize=sizeof(NOTIFYICONDATA); QJFx/zU
data.hWnd=GetSafeHwnd(); *uYnu|UQH
data.uID=98; F(E3U'G
Shell_NotifyIcon(NIM_DELETE,&data); >S / Zd
ShowWindow(SW_SHOW); *&X.
SetForegroundWindow(); S[fzy$">
ShowWindow(SW_SHOWNORMAL); sY?pp
'}a
bTray=FALSE; '>:mEXK}w
} -a`EL]NX
YQ>P{I%J
void CCaptureDlg::OnChange() O@U[S.IK
{ |;q*Zy(
RegisterHotkey(); c1j)
} "rz|sbj
EZkg0FhkZ
BOOL CCaptureDlg::RegisterHotkey() J-lQPMI,
{ [ V`j@dV
UpdateData(); =~YmM<L
UCHAR mask=0; +O23@G?x
UCHAR key=0; [07N<<
if(m_bControl) t5h]]TOz
mask|=4; gvYib`#
if(m_bAlt) iqCKVo7:M
mask|=2; E^S[8=
if(m_bShift) @YyTXg{ZK
mask|=1; gO-C[j/
key=Key_Table[m_Key.GetCurSel()]; 't=\YFQ*v
if(bRegistered){ 11}fPWK
DeleteHotkey(GetSafeHwnd(),cKey,cMask); .?b2Bd!MC
bRegistered=FALSE; .fxI)
} CQfrAk4mu
cMask=mask; }fw;{&s{z
cKey=key; GW$(E*4q
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); v%3mhk#
return bRegistered; po_||NIY
} #3maT*JY
]X+3"
四、小结 juuBLv
GDC`\cy
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。