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:
:flx6,7D
/)YNs7gR 一、实现方法
,]bhy p :ci5r;^ 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:
\hTm)-FP m8A#~i . #pragma data_seg("shareddata")
6 eLR2 HHOOK hHook =NULL; //钩子句柄
C[ NSkr UINT nHookCount =0; //挂接的程序数目
;D3C>7y static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
e|)hG8FlF static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
95ZyP! static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
^yW L,$ static int KeyCount =0;
r(:5kC8K static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
wo4;n9@I #pragma data_seg()
h{%nC>m; 3x`| 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。
"un]Gc umjt]Gu[ 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:
V3&RJ k=b ]] !VK BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
). <-X^@ cKey,UCHAR cMask)
qraSRK5 {
WffQ :L? BOOL bAdded=FALSE;
&-;4.op for(int index=0;index<MAX_KEY;index++){
zNs55e.rx if(hCallWnd[index]==0){
yMG1XEhuG hCallWnd[index]=hWnd;
3k\#CiB{ HotKey[index]=cKey;
Lf16j*}-Q HotKeyMask[index]=cMask;
h{CL{>d bAdded=TRUE;
=#;3Q~:Jl^ KeyCount++;
v&9y4\j break;
8L,5Q9
$ }
MV5 _L3M }
)F}F_Y return bAdded;
5&QJ7B,! }
MX$0Op //删除热键
caU0\VS BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
'9laa=H%8 {
fa-IhB1!K BOOL bRemoved=FALSE;
N@2dA*T, for(int index=0;index<MAX_KEY;index++){
ohRjvJ'v| if(hCallWnd[index]==hWnd){
(jnQ
- if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
D[4u+g?[}> hCallWnd[index]=NULL;
r)lEofX,g+ HotKey[index]=0;
aT{_0m$G10 HotKeyMask[index]=0;
v|gw9 bRemoved=TRUE;
*F+KqZ.2 KeyCount--;
g,Lq)'N;O break;
lG9bLiFY }
u8'Zl8g }
xqeyD* s }
tClg*A;|B return bRemoved;
QiQ_bB!\ }
w^?>e;/\ 'KP@W9j n&L+wqJ DLL中的钩子函数如下:
^&B@Uw5{ ~FZ&.<s
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
xu>9(,l {
-?H#LUk BOOL bProcessed=FALSE;
&b.=M>\9Q if(HC_ACTION==nCode)
?ME6+Z\ {
[glLre^ if((lParam&0xc0000000)==0xc0000000){// 有键松开
oL!EYbFD'Z switch(wParam)
5-|:^hU9 {
,-$LmECg case VK_MENU:
,g%0`SO MaskBits&=~ALTBIT;
4qO+_!x{) break;
6w*dKInG[- case VK_CONTROL:
ot,jp|N>f~ MaskBits&=~CTRLBIT;
QCD.YFM break;
:nh_k4S@v case VK_SHIFT:
?}Z1bH MaskBits&=~SHIFTBIT;
q]\:P.x!> break;
K`yRr`pW default: //judge the key and send message
+Jlay1U& break;
6o!!=}'E[ }
p09HL%~R for(int index=0;index<MAX_KEY;index++){
-Y1e8H =' if(hCallWnd[index]==NULL)
Z)e/!~""] continue;
c>,'Y)8 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
@GPCwE1 {
o@r7
n>G
SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
"LHcB]^< bProcessed=TRUE;
s28`OKC} }
!Xh=k36 }
g$":D }
i{Uc6R6 else if((lParam&0xc000ffff)==1){ //有键按下
&Q%zl9g(g switch(wParam)
qt"G[9; {
+@A case VK_MENU:
Rvkedb MaskBits|=ALTBIT;
c%^7!FSg break;
7G:s2432 case VK_CONTROL:
0Be<X MaskBits|=CTRLBIT;
)s)I2Z+ break;
6|K5!2 case VK_SHIFT:
d:_t-ZZo MaskBits|=SHIFTBIT;
0m7Y>0wC6T break;
S(o#K|)> default: //judge the key and send message
9?A)n4b; break;
ko5 @qNq }
#Z}Rfk(~ for(int index=0;index<MAX_KEY;index++){
)mI 05 if(hCallWnd[index]==NULL)
}Q)#[#e continue;
fsmN)_T if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
XpIklL7 {
wc0jhHZO
? SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
IrR7"`.i bProcessed=TRUE;
}^4Xv^dW>g }
@y e4q.m }
__lM7LFL }
,oORW/0iS if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
d)B@x` for(int index=0;index<MAX_KEY;index++){
=4vy@7/ if(hCallWnd[index]==NULL)
9V'%<pk''( continue;
[=x[ w70 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
a[v0%W ]u SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
.0p0_f= //lParam的意义可看MSDN中WM_KEYDOWN部分
ZWii)0'PV }
t#yk->, }
G
!<Z.] }
~Xw"}S5 return CallNextHookEx( hHook, nCode, wParam, lParam );
!ds"9w }
5(Cl1Yse=r JHW"-b 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:
Zvhsyz| JBD7h5|Lc BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
,f kcp]} BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
zUDg&-J3 V@\gS"Tu 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:
Nw:GCf-L \Lq h j LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
Y}@&h! {
|$+3a if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
ZkgV_<M| {
G=)i{oC //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
:f Kl]XO SaveBmp();
<i<J^-W return FALSE;
:KH g&ZX7 }
\/E>4)MD y …… //其它处理及默认处理
B*qi_{Gp }
y9_V m9)p-1y@5 Dw|}9;5:A 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
uzXCIv@ iz5CAxm 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
BK*x] zG$ vrl;"Fm+ 二、编程步骤
SD#]$v M])ZK 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
)W|w C# 6.FY0. i 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
MU>k,:[ "-y-iJ 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
<
|e,05aM p$SX 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;
T _M!<J JgG$?n\ 5、 添加代码,编译运行程序。
agkA}O )js)2L~ 三、程序代码
#XK2Ien)Z hS_6 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
?=>+LqP #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
Ytgcs(
/$ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
S(QpM.9* #if _MSC_VER > 1000
dCb`xR} #pragma once
,?PTcQF #endif // _MSC_VER > 1000
%el"BSB #ifndef __AFXWIN_H__
M]<?k]_p #error include 'stdafx.h' before including this file for PCH
U2$d%8G #endif
|\w=u6jX #include "resource.h" // main symbols
85lCj-cs class CHookApp : public CWinApp
M=.:,wRm {
xrlmKSPa public:
=nz}XH%= CHookApp();
>d~WH@o`G // Overrides
g"Ljm7 // ClassWizard generated virtual function overrides
+
r!1<AAE$ //{{AFX_VIRTUAL(CHookApp)
ckV`OaRw4 public:
oV)~@0B&0 virtual BOOL InitInstance();
%?LOs
H virtual int ExitInstance();
aGK?x1_ //}}AFX_VIRTUAL
sfLMkE //{{AFX_MSG(CHookApp)
4f@o mAM // NOTE - the ClassWizard will add and remove member functions here.
INUG*JC6 // DO NOT EDIT what you see in these blocks of generated code !
=b38(\ //}}AFX_MSG
U0=] DECLARE_MESSAGE_MAP()
"ZHW2l Mf };
_\=`6`b) LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
`(T,+T4C5k BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
v. %R}Pa BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
a5 *2h{i BOOL InitHotkey();
Y;nZ=9Sw BOOL UnInit();
c?P?yIz6p #endif
:iFIQpk BeCWa>54i //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
^
K|;~}P #include "stdafx.h"
&lR 6sb\ #include "hook.h"
L}GC<D: #include <windowsx.h>
H&F9J^rC #ifdef _DEBUG
*+'x~a #define new DEBUG_NEW
Ny_lrfh) [ #undef THIS_FILE
F1 iGMf-8 static char THIS_FILE[] = __FILE__;
8iW;y2qF #endif
& +4gSr #define MAX_KEY 100
##KBifU" #define CTRLBIT 0x04
pkP?i5, #define ALTBIT 0x02
e'~Zo9`r6 #define SHIFTBIT 0x01
FSU ttg" #pragma data_seg("shareddata")
qs|mj}? HHOOK hHook =NULL;
[FK<96.nt UINT nHookCount =0;
x2@U.r"zo static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
Mmj;'iYOwF static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
"dsU>3u static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
}
$uxJB static int KeyCount =0;
ZPc@Zr`z static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
Wf>zDW^"R #pragma data_seg()
:k7uGD HINSTANCE hins;
x8!ol2\`< void VerifyWindow();
^BUYjq%(` BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
Av?2< //{{AFX_MSG_MAP(CHookApp)
\2nUa
; // NOTE - the ClassWizard will add and remove mapping macros here.
QF-LU
// DO NOT EDIT what you see in these blocks of generated code!
UUF;p2{f //}}AFX_MSG_MAP
3VI4X END_MESSAGE_MAP()
Q
s.pGi0W [(o7$i29|% CHookApp::CHookApp()
zR
`EU, {
~)qtply // TODO: add construction code here,
7~&/_3 // Place all significant initialization in InitInstance
PN0VQ/.. }
Ad:TYpLD .P.z B}0= CHookApp theApp;
7~9S 9 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
ygeDcnvR] {
U`,0]"Qk BOOL bProcessed=FALSE;
\(VTt|}By$ if(HC_ACTION==nCode)
bfA=3S"0 {
,QC{3i~ if((lParam&0xc0000000)==0xc0000000){// Key up
XGJj3-eW{ switch(wParam)
76wc ,+ {
cUqke+! case VK_MENU:
H_EB1"C;\ MaskBits&=~ALTBIT;
kxp); break;
0E?jW7yr case VK_CONTROL:
?9 ! Z<H MaskBits&=~CTRLBIT;
\
W?R break;
rm4.aO~-F case VK_SHIFT:
vy_D>tp MaskBits&=~SHIFTBIT;
'7D,m
H break;
?notxE7 ] default: //judge the key and send message
:[\v break;
%@;6^= }
d}LR l" _n for(int index=0;index<MAX_KEY;index++){
@S|jC2^+h if(hCallWnd[index]==NULL)
H~GQ;PhRx continue;
Y7#-Fra0W if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
WX}xmtLs {
i:rFQ8I SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
)'/|) bProcessed=TRUE;
umF
Z?a }
.fN"@l }
&j?#3Qt'_ }
@Ukr else if((lParam&0xc000ffff)==1){ //Key down
<EPj$:: switch(wParam)
F6o_b4l {
@Ys!DScY, case VK_MENU:
!FA# K8 MaskBits|=ALTBIT;
L f"i
! break;
c~{9a_G case VK_CONTROL:
@[#$J0qq MaskBits|=CTRLBIT;
s
<
break;
"]oO{'1X case VK_SHIFT:
qb5#_1qz+^ MaskBits|=SHIFTBIT;
ysmNio break;
[cTe54n default: //judge the key and send message
%STliJ break;
*+TH#EL2 }
} X^|$ for(int index=0;index<MAX_KEY;index++)
%{(x3\ *& {
nL$x|}XAcj if(hCallWnd[index]==NULL)
:ml2.vP continue;
o@#Y8M if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
?."&MZ {
$U$V?xuE SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
K TsgJ\W bProcessed=TRUE;
7SlsnhpW }
+Vo}F }
"z0zpHXek }
OkCQ?] if(!bProcessed){
Ma'_e=+A for(int index=0;index<MAX_KEY;index++){
c9kzOQ2n if(hCallWnd[index]==NULL)
/n5F(5< continue;
%q!8={J8 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
T[,/5J SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
U~}
U\_ }
HDda@Jy }
5DXR8mLoaJ }
by'DQ 00 return CallNextHookEx( hHook, nCode, wParam, lParam );
^qg?6S4 }
L7= Q<D< "6R
5+ BOOL InitHotkey()
!L;\cl {
Aub]IO~ if(hHook!=NULL){
Di@GY! nHookCount++;
N[<H7_/3 return TRUE;
r'dr9"-{ }
p.
R2gl1m else
3' ~gviI hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
B|C/
Rk6? if(hHook!=NULL)
&?uz`pv2 nHookCount++;
HQUeWCN return (hHook!=NULL);
Py>{t4;S }
`+zWu55; BOOL UnInit()
-29gL_dk. {
2u"7T_"2D if(nHookCount>1){
=/u%c! nHookCount--;
j:}J}P return TRUE;
:}h>by= }
qS/V"|G( BOOL unhooked = UnhookWindowsHookEx(hHook);
4B4Z])$3 if(unhooked==TRUE){
s0*0 'f nHookCount=0;
|y h\ hHook=NULL;
xXY.AoO6 }
:U
d return unhooked;
rwniOQe }
DNR~_3Aq 1=|7mehL% BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
{^m(,K_ {
?_oF :*~\ BOOL bAdded=FALSE;
[F_/2+e for(int index=0;index<MAX_KEY;index++){
UWZa|I~:J if(hCallWnd[index]==0){
e/*$^i+S hCallWnd[index]=hWnd;
|.F HotKey[index]=cKey;
V~T@6S HotKeyMask[index]=cMask;
J0
k bAdded=TRUE;
:-iMdtm KeyCount++;
Ja]?&j break;
;>%~9j1C }
ui"3ak+F }
'DCFezdf3 return bAdded;
5jgdbHog] }
'=E3[0W uk9g<<3T BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Zes+/.sA}] {
xy8#2 BOOL bRemoved=FALSE;
~
^>417> for(int index=0;index<MAX_KEY;index++){
Ku/~N# if(hCallWnd[index]==hWnd){
$55U+)C< if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
X; 5Jb hCallWnd[index]=NULL;
k-E{d04-2 HotKey[index]=0;
F,GN[f- HotKeyMask[index]=0;
4D$;KokZ bRemoved=TRUE;
g|Y] wd KeyCount--;
tM,%^){p$ break;
'JdkUhq1V }
WKrX,GF }
rZojY}dWJ }
SVa6V}"Iv return bRemoved;
FZ|CqD"# }
yoRU_%xA Uu"0rUzt void VerifyWindow()
QN>7~=` {
rVtw-[p for(int i=0;i<MAX_KEY;i++){
@ct+7v~ if(hCallWnd
!=NULL){ - ZW3
if(!IsWindow(hCallWnd)){ .c^
ggy%
hCallWnd=NULL; l;"Ab?P\
HotKey=0; *9 Q^5;y
HotKeyMask=0; [EY`am8[
KeyCount--; oyk>vIZ
} [ U8$HQ+x
} 1z*kc)=JF8
} U{~SXk'2+
} /ahNnCtu?1
Z~6[ Z
BOOL CHookApp::InitInstance() o<l 2 r
{ 3Db3xN
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ~P-*}q2J
hins=AfxGetInstanceHandle(); #fs|BV
!
InitHotkey(); {%.Lk'#9
return CWinApp::InitInstance(); 4KI [D{
}
sM\lO
dQgk.k
int CHookApp::ExitInstance() aV`&L,Q)7E
{ tfkr+
/
VerifyWindow(); >p])it[q&$
UnInit(); mxFn7.|r~
return CWinApp::ExitInstance(); =q(GHg;'
} 'R9g7,53R
|xr\H8:(!
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file J^m<*
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) sT1&e5`W
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ~vgA7E/XV
#if _MSC_VER > 1000 aF8k/$u
#pragma once /}5B&TZ=(3
#endif // _MSC_VER > 1000 _2hXa!yO
k$Rnj`*^
class CCaptureDlg : public CDialog wU`!B<,j
{ yg;_.4TpIO
// Construction Q0_>'sEM
public: Ybg-"w
BOOL bTray; yPu4T6Vv
BOOL bRegistered; PoShQR<
BOOL RegisterHotkey(); t~M
$%)h
UCHAR cKey; OQ4c#V?
UCHAR cMask; -Dzsa
void DeleteIcon(); f+Dn9t
void AddIcon(); .G>t72DpU
UINT nCount; =y%rG :!
void SaveBmp(); ] c}91
CCaptureDlg(CWnd* pParent = NULL); // standard constructor JmOW~W
// Dialog Data 5IqQ |/m<6
//{{AFX_DATA(CCaptureDlg) fT
Y/4(
enum { IDD = IDD_CAPTURE_DIALOG }; !q4x~G0d
CComboBox m_Key; W9J1=
BOOL m_bControl; h4fLl3%H
BOOL m_bAlt; \k.vN@K#
BOOL m_bShift; ~ eN8|SR
CString m_Path; C:\(~D*GS
CString m_Number; $v}<'
//}}AFX_DATA Ulqh@CE)
// ClassWizard generated virtual function overrides ?M6ag_h3
//{{AFX_VIRTUAL(CCaptureDlg) ujgLJ77
public: qJ8-9^E,L
virtual BOOL PreTranslateMessage(MSG* pMsg); oP,9#FC|(
protected: t7F.[uWD
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support `_ (~ Ud
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); > %*B`oqo
//}}AFX_VIRTUAL Vm8D "I5i
// Implementation lQ*eH10H
protected: 7w58L:)B.
HICON m_hIcon; Jm(ixekp
// Generated message map functions =qoRS0Qa
//{{AFX_MSG(CCaptureDlg) 2H[)1|]l
virtual BOOL OnInitDialog(); ^uaFg`S
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); noA-)
afx_msg void OnPaint(); Ie'P#e'
afx_msg HCURSOR OnQueryDragIcon(); X;fy\HaU
virtual void OnCancel(); 45}v^|Je\
afx_msg void OnAbout(); s&*yk p
afx_msg void OnBrowse(); BIWD/|LQ
afx_msg void OnChange(); b; 9n'UX\
//}}AFX_MSG :kw0y
DECLARE_MESSAGE_MAP() O|v
(58A
}; eZF'Ck y
#endif CJNG) p
P#G.lft"O
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file #Ws53mT
#include "stdafx.h" 6E9N(kFYs
#include "Capture.h" 5M?mYNQR/H
#include "CaptureDlg.h" A['uD<4b
#include <windowsx.h> y7zkAXhJ
#pragma comment(lib,"hook.lib") :%_q[}e
#ifdef _DEBUG HdQj?f3
#define new DEBUG_NEW Li`hdrO'ii
#undef THIS_FILE ]TK=>;&
static char THIS_FILE[] = __FILE__; 6w#nkF
#endif [}""@?
#define IDM_SHELL WM_USER+1 VEh]p5D
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 9NIy#
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); JmWR{du
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 2mJ:c
class CAboutDlg : public CDialog w@N{@tG
{ o+)A'S
public: /)1v9<vM"
CAboutDlg(); ]XrE
// Dialog Data 6$B'Q30}r
//{{AFX_DATA(CAboutDlg) Uu2N9.5
enum { IDD = IDD_ABOUTBOX }; ha'qIT3&
//}}AFX_DATA 2uu[52H8d%
// ClassWizard generated virtual function overrides [V< 1_zqt
//{{AFX_VIRTUAL(CAboutDlg) ^!@*P,'I
protected: -h\@RC
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support &|z544
//}}AFX_VIRTUAL ag]*DsBt
// Implementation \8_V(lU
protected: &,uC9$
//{{AFX_MSG(CAboutDlg) J'7 y
//}}AFX_MSG +>E5X4JC
DECLARE_MESSAGE_MAP() q0|ZoP
}; T8q[7Zn
:c;_a-69
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) a"qR J-@
{ /Nqrvy=
//{{AFX_DATA_INIT(CAboutDlg) sQ(1/"gb
//}}AFX_DATA_INIT lS{4dvr?w
} lV7IHX1P
4 ?2g&B\
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 92(~'5Qr
{ FrR9{YTA.
CDialog::DoDataExchange(pDX); j7sU0"7^
//{{AFX_DATA_MAP(CAboutDlg) OPJgIU%
//}}AFX_DATA_MAP S_T
} kbq:U8+k
T+W3_xIS X
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 8on[%Vk
//{{AFX_MSG_MAP(CAboutDlg) JFJIls
// No message handlers oQBiPN+v.3
//}}AFX_MSG_MAP ^fZGX<fH
END_MESSAGE_MAP() D5[VK`4Z
n` #+L~X
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) z\h,SX<U
: CDialog(CCaptureDlg::IDD, pParent) W8uVd zQ
{ qj;l,Kua
//{{AFX_DATA_INIT(CCaptureDlg) {3SdX
m_bControl = FALSE; {fElto
m_bAlt = FALSE; )v-Cj_W5]"
m_bShift = FALSE; x#o?>5Qg?
m_Path = _T("c:\\"); ;E2~L
m_Number = _T("0 picture captured."); (.oaMA"B
nCount=0; T:)% P6/
bRegistered=FALSE; ._K$0U!
bTray=FALSE; hwZ6.
//}}AFX_DATA_INIT 5^o3y.J?P
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 .r6YrB@['
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); p9w%kM?
} _}z_yu#jY
%30T{n:
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) I W8.
{ g?$e^ls
CDialog::DoDataExchange(pDX); MyM+C}
//{{AFX_DATA_MAP(CCaptureDlg) 7n<#y;wo
DDX_Control(pDX, IDC_KEY, m_Key); }RDb1~6C
DDX_Check(pDX, IDC_CONTROL, m_bControl); Z3I L8
DDX_Check(pDX, IDC_ALT, m_bAlt); xK=J.>h3
DDX_Check(pDX, IDC_SHIFT, m_bShift); IKtiR8
DDX_Text(pDX, IDC_PATH, m_Path); ~e+0c'n\
DDX_Text(pDX, IDC_NUMBER, m_Number); IF$^0q
//}}AFX_DATA_MAP '@S,V/jy0z
} Kd
TE{].d
][rTQt m
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) e7hO;=?b'
//{{AFX_MSG_MAP(CCaptureDlg) F42TKPN^uu
ON_WM_SYSCOMMAND() SDJ;*s-
ON_WM_PAINT() eTT^KqE>&
ON_WM_QUERYDRAGICON() +Gp!cGaAm
ON_BN_CLICKED(ID_ABOUT, OnAbout) XzN-slu!
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) xf[zE Et
ON_BN_CLICKED(ID_CHANGE, OnChange) 6HB]T)n
//}}AFX_MSG_MAP A@\qoS[
END_MESSAGE_MAP() ,Os7T 1>
9DY|Sa]#=
BOOL CCaptureDlg::OnInitDialog() D'85VZEFyo
{ wFn@\3%l`
CDialog::OnInitDialog(); AE]i
V {p
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); )fy<P;g
ASSERT(IDM_ABOUTBOX < 0xF000);
~t$mw,
CMenu* pSysMenu = GetSystemMenu(FALSE); &l?N:(r
if (pSysMenu != NULL) hq]xmM?&
{ a$laRtId7
CString strAboutMenu; S]5VEn;pV
strAboutMenu.LoadString(IDS_ABOUTBOX); N!.kq4$.
if (!strAboutMenu.IsEmpty()) rSzQUn<
{ ja L$LJV
pSysMenu->AppendMenu(MF_SEPARATOR); X9 z:D>
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); @yCW8]
} P7cge
} %
i%ew4
SetIcon(m_hIcon, TRUE); // Set big icon %f>X-*}NI-
SetIcon(m_hIcon, FALSE); // Set small icon (v|ixa
m_Key.SetCurSel(0); p"g1V7B
RegisterHotkey(); CL
EpB2_
CMenu* pMenu=GetSystemMenu(FALSE); )#)nBM2\
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 0I(uddG3
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); -??!@R7V
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 5#yJK>a7
return TRUE; // return TRUE unless you set the focus to a control HDa~7wE
} l@~1CMyN
V@LN
1|
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) `WP@ZSC6
{ |R[v@c`pn
if ((nID & 0xFFF0) == IDM_ABOUTBOX) J2)-cY5G
{ d'x<-l9
CAboutDlg dlgAbout; xYT#!K1*
dlgAbout.DoModal(); &e/@yu)x,
} AB/,S
else FGV}5L
{ ',L{CQA?c
CDialog::OnSysCommand(nID, lParam); s$js5
ou
} k,
$I59
} 4!NfQk>X
J(3gT}z-
void CCaptureDlg::OnPaint() T_(qN;_
{ *(@L+D0N
if (IsIconic()) M@',3
{ jc${.?m
CPaintDC dc(this); // device context for painting ._8xY$l$
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); dM$N1DB{U+
// Center icon in client rectangle j|3g(_v4W
int cxIcon = GetSystemMetrics(SM_CXICON); o+]Y=r2
int cyIcon = GetSystemMetrics(SM_CYICON); CpUI|Rs
CRect rect; D{Hh#x8Y
GetClientRect(&rect); ^zBjG/'7
int x = (rect.Width() - cxIcon + 1) / 2; bEVO<x+
int y = (rect.Height() - cyIcon + 1) / 2; '*o7_Ez-{
// Draw the icon bd@*vu}?}
dc.DrawIcon(x, y, m_hIcon); %s~NQ;Y
} N1D6D$s 0
else ORV}j,Ym
{ V%X:1 8j
CDialog::OnPaint(); c^i"}2+
} 'd|Q4RE+W
} [0mFy)6
;zfQ3$@9
HCURSOR CCaptureDlg::OnQueryDragIcon() i6meY$l
{ N#<zEAB
return (HCURSOR) m_hIcon; O;"*_Xq(`
} ~rVKQ-+4&
"N?%mCPI
void CCaptureDlg::OnCancel() # i`A4D
{ d,GtH)( s
if(bTray) GInZ53cQ
DeleteIcon(); *F26}q
CDialog::OnCancel(); .g6PrhzFbk
} hqhu^.}]
1qB!RIau
void CCaptureDlg::OnAbout() h,!G7V
{ >N+bU{s
CAboutDlg dlg; e>])m3xvn
dlg.DoModal(); el2*\(XT
} )OW(T^>_'I
U}A|]vi@
void CCaptureDlg::OnBrowse() u7<qaOzs?
{ Sleu#]-
CString str; *G2)@0
{
BROWSEINFO bi; (>!]A6^L~
char name[MAX_PATH]; BR&Qw'O%
ZeroMemory(&bi,sizeof(BROWSEINFO)); @2GhN&=
bi.hwndOwner=GetSafeHwnd(); NB!'u)
lFD
bi.pszDisplayName=name; |.Y@^z;P3
bi.lpszTitle="Select folder"; I,C AFq
bi.ulFlags=BIF_RETURNONLYFSDIRS; AF9[2AH=Y
LPITEMIDLIST idl=SHBrowseForFolder(&bi); UX-_{I
QW
if(idl==NULL) VuX>
return; pJ2:` f<;
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Z1)jRE2dl
str.ReleaseBuffer(); cuV8#:
i
m_Path=str; .-O@UQx.I
if(str.GetAt(str.GetLength()-1)!='\\') 8%vh6$s6/
m_Path+="\\"; ]Omb :
UpdateData(FALSE); okK/i
} rm5T=fNJ
T!^?d5uW#
void CCaptureDlg::SaveBmp() Vid{6?7kh
{ tdw\Di#m
CDC dc;
Gh)sw72
dc.CreateDC("DISPLAY",NULL,NULL,NULL); gW6G+
CBitmap bm; 6oTbn{=UUq
int Width=GetSystemMetrics(SM_CXSCREEN); ]<\;d
B
int Height=GetSystemMetrics(SM_CYSCREEN); Q+u#?['
bm.CreateCompatibleBitmap(&dc,Width,Height); k *G!.
CDC tdc; ]2aYi9)
tdc.CreateCompatibleDC(&dc); `Q1WVd29
CBitmap*pOld=tdc.SelectObject(&bm); q{9X.-]}
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ^.Ih,@N6
tdc.SelectObject(pOld); sT[av
BITMAP btm; E&s'uE=w+
bm.GetBitmap(&btm); 4BduUH
DWORD size=btm.bmWidthBytes*btm.bmHeight; /A[oj2un
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); *D09P%
BITMAPINFOHEADER bih; HX /GLnY/X
bih.biBitCount=btm.bmBitsPixel; |&0"N[t
bih.biClrImportant=0; .%J?T5D
bih.biClrUsed=0; xnRp/I
bih.biCompression=0; (giTp@Tp
bih.biHeight=btm.bmHeight; Dh!iY0Lz
bih.biPlanes=1; },Re5W nl
bih.biSize=sizeof(BITMAPINFOHEADER); ^ sf[dr;BA
bih.biSizeImage=size; 3x(MvW30Lg
bih.biWidth=btm.bmWidth; PcNfTB{
bih.biXPelsPerMeter=0; r:WgjjA%
bih.biYPelsPerMeter=0; R[>;_}5">
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 7q2"b?|h
static int filecount=0; {l *&l2
CString name; ?sjZ13 SUa
name.Format("pict%04d.bmp",filecount++); :cmI"Bo
name=m_Path+name; cAKoPU>U
BITMAPFILEHEADER bfh; v0hfY
bfh.bfReserved1=bfh.bfReserved2=0; }`<>$2b
bfh.bfType=((WORD)('M'<< 8)|'B'); >XXMIz:
bfh.bfSize=54+size; ^M"=A}h
bfh.bfOffBits=54; Rvu3Qo+
CFile bf; ~J. Fl[
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ VkN[=0a,
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Tk v
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); }n2-*{)x
bf.WriteHuge(lpData,size); aaqd:N)
bf.Close(); O{i_?V_
nCount++; &JXHDpd$a^
} {xBjEhQm
GlobalFreePtr(lpData); Z$#ZYD
if(nCount==1) g+KzlS[6
m_Number.Format("%d picture captured.",nCount); m`yn9(1Y[
else 5|~r{w)9
m_Number.Format("%d pictures captured.",nCount); CyK$XDHa
UpdateData(FALSE); w
/W
Cj4`
} +/b4@B7
A9qO2kq7_
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Y)4Nydq
{
ELgae1
if(pMsg -> message == WM_KEYDOWN) NBg>i7KQ
{ -t~B@%
if(pMsg -> wParam == VK_ESCAPE) ![P(B0Ct/
return TRUE; ~0^,L3M
if(pMsg -> wParam == VK_RETURN) Hdq/E>u
return TRUE; U@v8H!p^i
} Y?vm%t`K
return CDialog::PreTranslateMessage(pMsg); Fzld0p9=
} dE}b8|</
Y="&|c=w#L
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) fD#&: )
{ ap'kxOf"1
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ B[0,\>
SaveBmp(); _E&vE5<-$
return FALSE; Am0.c0h
} "!6 B5Oz
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ^/d^$
CMenu pop; ,^+R%7mv
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); @Y&9S)xcE
CMenu*pMenu=pop.GetSubMenu(0); pv m'pu78
pMenu->SetDefaultItem(ID_EXITICON); P15* VPy
CPoint pt; %oCjZ"ke
GetCursorPos(&pt); J_wz'eIb0
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); oCdOC5
if(id==ID_EXITICON) _!^FW%
DeleteIcon(); zIQc#F6\5
else if(id==ID_EXIT) im?XXsH'
OnCancel(); a]wcA
return FALSE; syNb0LR
} N;ecT@Ug
LRESULT res= CDialog::WindowProc(message, wParam, lParam); <<2b2?aS`
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) {!g.255+
AddIcon(); V\M!]Nnxr
return res; 'y M:WcN
} ^Lfn3.M
U_{JM`JY
void CCaptureDlg::AddIcon() ge
{4;,0=
{ @H# kvYWmn
NOTIFYICONDATA data; 2-E71-J
data.cbSize=sizeof(NOTIFYICONDATA); bq6{ty"
CString tip; ISnS;
tip.LoadString(IDS_ICONTIP); x&fCe{5
data.hIcon=GetIcon(0); sBXk$
data.hWnd=GetSafeHwnd(); ~Ro:mH:w
strcpy(data.szTip,tip); ?jn6Op
data.uCallbackMessage=IDM_SHELL; "0 PN
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; np\Q&
data.uID=98; zl#&Qm4Ot
Shell_NotifyIcon(NIM_ADD,&data); sV'.Bomq
ShowWindow(SW_HIDE); '
bw, K*
bTray=TRUE; wY
;8UN
} &N7:k+E
3F'dT[;
void CCaptureDlg::DeleteIcon() x>9EVa)
{ F.
oP!r
NOTIFYICONDATA data; --%2=.X=
data.cbSize=sizeof(NOTIFYICONDATA); OYtus7q<
data.hWnd=GetSafeHwnd(); WZ6{(`;#m
data.uID=98; &'yV:g3H
Shell_NotifyIcon(NIM_DELETE,&data); <[5$ {)
ShowWindow(SW_SHOW); !g&B)0u]*
SetForegroundWindow(); Y&Lk4
ShowWindow(SW_SHOWNORMAL); WfbNar[
bTray=FALSE; W>|b98NPu
} t02"v4_i
l`%}
{3r9
void CCaptureDlg::OnChange() gcCYXPZp
{ x[>_I1TJ
RegisterHotkey(); k`~br249
} ~\}EROb<
Q
fyERa\rb
BOOL CCaptureDlg::RegisterHotkey() c3!|h1h/v
{ ^$,kTU'=
UpdateData(); pH:|G
UCHAR mask=0; &?`&X=Q
UCHAR key=0; i |^`gly
if(m_bControl) :lQjy@J
mask|=4; .z>." `
if(m_bAlt) UO!6&k>c
mask|=2; H$z+gbjJ
if(m_bShift) f$W}d0(F;
mask|=1; rLVc<595
key=Key_Table[m_Key.GetCurSel()]; !>@V#I
if(bRegistered){ Iy4MMU
DeleteHotkey(GetSafeHwnd(),cKey,cMask); WblV`"~e
bRegistered=FALSE; FC(cXPX}
} I64:-P[\
cMask=mask; #:zPpMAl
cKey=key; D&m"~wI
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); >(ww6vk2
return bRegistered; j6HbJ#]
} 2y7q
x1$C
446hr zW>@
四、小结 8=o(nFJw
*Z2Q]?:{
i
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。