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:
PI~LbDE
BFmYbK 一、实现方法
i|+ EC_^< 8`}(N^=} 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:
Z\6&5r= -=,%9r #pragma data_seg("shareddata")
Cr|v3Y#h' HHOOK hHook =NULL; //钩子句柄
QIQ }ia UINT nHookCount =0; //挂接的程序数目
iaBy/!i static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
2MwRjh_ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
aZ^P*|_K3 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
K}ACZT)Wp static int KeyCount =0;
Dv?'(.z static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
bG=CIa&@ #pragma data_seg()
s.+2[R1HF N+)4]ir> 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。
^~}|X%q3 WLGx=
; 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:
.CH0PK=l ;m$F~!Y BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
=t1.j=oC
cKey,UCHAR cMask)
4K` N3 {
3)v6N_ BOOL bAdded=FALSE;
X||Z>w}v for(int index=0;index<MAX_KEY;index++){
]X~;?>#:p if(hCallWnd[index]==0){
X_|W#IM*+ hCallWnd[index]=hWnd;
<SI&e/ HotKey[index]=cKey;
.QOQqU*2I HotKeyMask[index]=cMask;
:"? boA#L bAdded=TRUE;
(UmoG KeyCount++;
GczGW4\P' break;
yo*c& > }
MN\/F4Io }
g/,fjM_ return bAdded;
JG&`l{c9 }
*u.6,jw //删除热键
Wh[+cH"M BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
OQ"%(w>Hb {
Z0T{1YEJ BOOL bRemoved=FALSE;
b3}928!D-@ for(int index=0;index<MAX_KEY;index++){
Et~b^8$> if(hCallWnd[index]==hWnd){
mN3}wJ}J if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
h+F@apUS hCallWnd[index]=NULL;
']^e,9=Q HotKey[index]=0;
G|FF HotKeyMask[index]=0;
jq(3y|6, bRemoved=TRUE;
CBdSgHA3> KeyCount--;
Vt{C80n&N break;
!
{lcF% }
=
aSHb[hO }
epa)ctS9 }
cC
w,b] return bRemoved;
eIc~J!?<&V }
{H s""/sb dgPJte%i ;hR!j!3} DLL中的钩子函数如下:
e'aKI]>a :0>wm@qCQ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
en>d T {
jQ.]m BOOL bProcessed=FALSE;
AfW63;kH if(HC_ACTION==nCode)
8=ubMqr[ {
!J!zi if((lParam&0xc0000000)==0xc0000000){// 有键松开
pgz3d{]ua switch(wParam)
1;r^QAK& {
SzkF-yRd case VK_MENU:
s`Fv! MaskBits&=~ALTBIT;
lM Gz"cym break;
B'6^E#9 case VK_CONTROL:
hk4f)z MaskBits&=~CTRLBIT;
?cdSZ'49[ break;
ep<A d case VK_SHIFT:
dj4 g MaskBits&=~SHIFTBIT;
{;^booq break;
Us.yKAHPV default: //judge the key and send message
`Yp\.K z break;
HRi~TZ?\ }
$+Ke$fq.> for(int index=0;index<MAX_KEY;index++){
E(tdL,m' if(hCallWnd[index]==NULL)
g(<02t!OT= continue;
m3XL;1y:a if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
B#o(21s {
kH*l83 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
V[,/Hw~d% bProcessed=TRUE;
WpC@nz? }
3P Twpq1 }
0K7]<\) }
pVn6>\xa else if((lParam&0xc000ffff)==1){ //有键按下
lqAU5K{wQ switch(wParam)
USu/Y29 {
(FZL> case VK_MENU:
==(9P`\ MaskBits|=ALTBIT;
7|PpAvMF break;
#G{}Rd|! case VK_CONTROL:
b_ Sh#d& MaskBits|=CTRLBIT;
0TU~Q break;
udB:ys case VK_SHIFT:
ba|x?kz MaskBits|=SHIFTBIT;
|GE3.g break;
o*97Nbjn default: //judge the key and send message
w( `X P break;
td4*+)'FY }
!JUXq for(int index=0;index<MAX_KEY;index++){
@]tFRV if(hCallWnd[index]==NULL)
H7G*Vg continue;
mn\e(WoX if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Cca(
oV {
N J:]jd SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
k#`.!yI, bProcessed=TRUE;
O]w &uim }
(rFY8oHD }
CU6rw+Vax }
2N)=fBF%- if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
qfE/,L(B for(int index=0;index<MAX_KEY;index++){
k<=.1cFh if(hCallWnd[index]==NULL)
:BCjt@K} continue;
ttLChL if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
-Qo`UL.} SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
dW;{,Q //lParam的意义可看MSDN中WM_KEYDOWN部分
)vOZp& }
?yddr`?W }
)z3mS2 }
-"Lia!Q]M return CallNextHookEx( hHook, nCode, wParam, lParam );
n?@3R#4D3 }
'1ff| c!x9 fMwJwMT8 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:
2tCep g]iWD;61 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
/fA:Fnv BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
t d q;D T*\'G6e 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:
TWl':} kP%'{ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
2|tZ xlt- {
UBpYR>
<\ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
Rg<y8~|'} {
A)040n //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
GhLgV SaveBmp();
dTyTj|"x{ return FALSE;
(rt DT }
Um;ReJ8z …… //其它处理及默认处理
vuuID24: }
Ts:dnGR5 56u'XMB? Y[$[0 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
RmO-".$yt 9NaC7D$, 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
5'\/gvxIC a~OCo 二、编程步骤
,nMLua\ ,f$A5RN 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";
Qz{:m !fwLC"QC 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
Xo(K*eIN 6 )0$UW 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
WXNJc nfy"M),et 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
?Z(
6..& -}2q- 5、 添加代码,编译运行程序。
CeR4's7 ZNFn^iuQ 三、程序代码
\`{ YqO T >~TLgq* ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
BI;in;Ln #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
]. 1[H~5N #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
+
R])u5c' #if _MSC_VER > 1000
4xT(Uj #pragma once
Gi]Pwo${ #endif // _MSC_VER > 1000
dQ`ch~HVUW #ifndef __AFXWIN_H__
KL sTgo|J #error include 'stdafx.h' before including this file for PCH
4&K~EX"^T #endif
$&n!j'C: #include "resource.h" // main symbols
|6`yE]3-( class CHookApp : public CWinApp
SWO$#X / {
&kXf)xc<~ public:
RJnRbaC CHookApp();
2aW&d=!ZV // Overrides
..'^1IOA // ClassWizard generated virtual function overrides
~?E x?!\9R //{{AFX_VIRTUAL(CHookApp)
jFw?Ky2 public:
M,e_=aq virtual BOOL InitInstance();
>8 t3a-/ virtual int ExitInstance();
DB:Ia5|*i //}}AFX_VIRTUAL
.cQwjL //{{AFX_MSG(CHookApp)
kxWf1hIz0 // NOTE - the ClassWizard will add and remove member functions here.
%l,p />r // DO NOT EDIT what you see in these blocks of generated code !
O9=vz% //}}AFX_MSG
#p*{p)]HiA DECLARE_MESSAGE_MAP()
p[h A?dXn };
n8A*Y3~R LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
+_06{7@h BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
KSqWq:W+ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
pHni"iT BOOL InitHotkey();
_4owxYSDke BOOL UnInit();
e}(ws~. #endif
}c|Xr^ GasIOPzK //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
0>4:(t7h\ #include "stdafx.h"
$}aLFb #include "hook.h"
3Q~ng2Wv% #include <windowsx.h>
_&.CI6 #ifdef _DEBUG
8>T
' #define new DEBUG_NEW
t 4{{5U'\ #undef THIS_FILE
i~n>dc YW static char THIS_FILE[] = __FILE__;
u <%,Ql #endif
d.% Vm&3 #define MAX_KEY 100
fJd!;ur)0 #define CTRLBIT 0x04
!R[o6V5T #define ALTBIT 0x02
6@ET3v #define SHIFTBIT 0x01
v#(wc+[ #pragma data_seg("shareddata")
N#6&t8;kTC HHOOK hHook =NULL;
-1:yqF.x UINT nHookCount =0;
$vTU|o>| static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
Pd%o6~_* static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
hR[Qdu6r static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
Q^DKKp static int KeyCount =0;
%S]5wR6;_ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
f<!eJO:<' #pragma data_seg()
zRD{"uqi HINSTANCE hins;
z4&|~-m, void VerifyWindow();
1
BAnf9
BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
y2TJDb1 //{{AFX_MSG_MAP(CHookApp)
xx#;)]WT // NOTE - the ClassWizard will add and remove mapping macros here.
9%$4Ux*q // DO NOT EDIT what you see in these blocks of generated code!
"So+ //}}AFX_MSG_MAP
gK9@-e END_MESSAGE_MAP()
jQj`GnN| ds4ERe / CHookApp::CHookApp()
(m-(5 CaJ {
D5]T.8kX(7 // TODO: add construction code here,
My5h;N@C // Place all significant initialization in InitInstance
BQ)zm }
RnIL>Akp n>+M4Zb CHookApp theApp;
n3g3(}Q0 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
2J|Wbey {
_Sosw|A BOOL bProcessed=FALSE;
P,j)m\| if(HC_ACTION==nCode)
=sG C {
B7fURL
Rqr if((lParam&0xc0000000)==0xc0000000){// Key up
Z<0M_q9?MO switch(wParam)
'eLO#1Ipf {
hof:36 < case VK_MENU:
<FRYt-+ MaskBits&=~ALTBIT;
bfQ+}|; break;
WDP$w(M case VK_CONTROL:
t1 OnA#]/_ MaskBits&=~CTRLBIT;
GW]Ygf1t break;
K`M 8[ %S case VK_SHIFT:
@@# ^G8+l MaskBits&=~SHIFTBIT;
=BMON{K break;
]pzf{8% default: //judge the key and send message
f]qPxRw break;
{3i.U028] }
Eii)zo8Xd for(int index=0;index<MAX_KEY;index++){
`$AX!,<!G if(hCallWnd[index]==NULL)
H CZ#7Z continue;
G9 ;X=c if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
\{\*h /m {
MIsjTKE SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
q#xoM1 bProcessed=TRUE;
"S,,Bj L }
>j4;{r+eQw }
fx_7X15 }
H]H*Ouu["e else if((lParam&0xc000ffff)==1){ //Key down
_<+! switch(wParam)
G yvEc3|@ {
2!QJa= case VK_MENU:
XPBKQm_} MaskBits|=ALTBIT;
?R(fxx break;
f0~<qT?:n case VK_CONTROL:
^|5vmI'E MaskBits|=CTRLBIT;
h
rW break;
f1rP+l-C< case VK_SHIFT:
QaH32(iH MaskBits|=SHIFTBIT;
rFh!&_ break;
-v/1R1$e1 default: //judge the key and send message
Ovxs+mQ break;
[1F.
}
pi*cO for(int index=0;index<MAX_KEY;index++)
pV9$Vg?-H {
`+CRUdr if(hCallWnd[index]==NULL)
B36_OH continue;
NoB)tAvw if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
bE74Ui {
8doKB<#_+= SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
08n2TL;EsX bProcessed=TRUE;
~Y7>P$G) }
W;4rhZEgd }
}R=n!Y$F }
c$Z3P%aP'V if(!bProcessed){
-,)&?S for(int index=0;index<MAX_KEY;index++){
`aD~\O if(hCallWnd[index]==NULL)
mXtsP1 continue;
l~b# Y& if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
?NOc]'<(G SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
-|bnvPmE }
X4_1kY; }
tg_xk+x }
i882r=TE3 return CallNextHookEx( hHook, nCode, wParam, lParam );
<~@}r\ }
LUc!a4i"fO Za_w@o BOOL InitHotkey()
_ I"}3* {
v*iD)k:|t if(hHook!=NULL){
K|%.mcs4 nHookCount++;
y-6k<RN return TRUE;
*'H0%GM }
&b'IYoe else
J~Uq'1? hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
"Rr)1x7 if(hHook!=NULL)
w<#/ngI2 nHookCount++;
!w2J*E\ return (hHook!=NULL);
Q"7vzri }
Y&!-VW BOOL UnInit()
MKPxF@N( {
|L[/]@| if(nHookCount>1){
{k*rD!tT nHookCount--;
^ >JAl<k return TRUE;
8JYU1Ew }
:d}I`)& BOOL unhooked = UnhookWindowsHookEx(hHook);
@rI+.X if(unhooked==TRUE){
"A\h+q- nHookCount=0;
O$zXDxn hHook=NULL;
QiC}hj$ }
]dIcW9a return unhooked;
eocq Hwbv }
;}1O\nngR /|Z_Dy BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
o1lhVM`15 {
)
rw!. )
BOOL bAdded=FALSE;
xs,,)jF(u for(int index=0;index<MAX_KEY;index++){
CoZOKRoaH if(hCallWnd[index]==0){
o]/*YaB2> hCallWnd[index]=hWnd;
>n$V1U&/ HotKey[index]=cKey;
VJbsM1y M HotKeyMask[index]=cMask;
Yw=7(} bAdded=TRUE;
c||EXFS}O KeyCount++;
XX&4OV,^%D break;
nl<TM96 }
|?A:[C#X }
u+EZ"p;o return bAdded;
xnP@h }
9UDanj P Gk:tT1 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
5<U:Yy {
4N6JKS BOOL bRemoved=FALSE;
AS4mJ UU9 for(int index=0;index<MAX_KEY;index++){
8]h~jNku if(hCallWnd[index]==hWnd){
5tx!LGOK if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
@n,V2`" hCallWnd[index]=NULL;
Br4[hUV/ HotKey[index]=0;
Y%9$! HotKeyMask[index]=0;
B']-4X{SGa bRemoved=TRUE;
fk&>2[^& KeyCount--;
rj}O2~W~4 break;
>PuQ{T I }
hZ_@U?^ }
VOJA}$ }
cYmgJBG return bRemoved;
Th_PmkvC }
(vP<} 2$r8^}Nj? void VerifyWindow()
G+7#!y Y {
^?J3nf{ for(int i=0;i<MAX_KEY;i++){
HTz5LAe~b7 if(hCallWnd
!=NULL){ ZSWZz8
if(!IsWindow(hCallWnd)){ ;gGq\c
hCallWnd=NULL; or,:5Z
HotKey=0; wxJu=#!M
HotKeyMask=0; =E.!Ff4~(
KeyCount--; MB7`'W
} ~Uw;6VXV1
} .jUM';
l
} rjK]zD9
} )E|{.K
H2lQ(Y+H
BOOL CHookApp::InitInstance() ;
DXsPpZC
{ ff&jR71E
AFX_MANAGE_STATE(AfxGetStaticModuleState()); -wa"&Q
hins=AfxGetInstanceHandle(); @yM$Et5
InitHotkey(); @U+#@6
return CWinApp::InitInstance(); /|0xOiib
} Z_U4Yy'NNw
+Tt.5>N
int CHookApp::ExitInstance() zfrNM9C
{ }1
,\*)5
VerifyWindow(); .^dtdFZ8,
UnInit(); \&_pI2X
return CWinApp::ExitInstance(); po\(O8#5U
} 2cEvsvw>
{8I,uQO
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file S=}1k,I
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) _?>x{![
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 'Zs3b4n8
#if _MSC_VER > 1000 {oSdVRI
#pragma once p$=Z0p4%LL
#endif // _MSC_VER > 1000 KFgq3snH
$J8g)cS
class CCaptureDlg : public CDialog / 3eGt7x#
{ !\VzX
// Construction x(n|zp ("
public: v%rmfI U
BOOL bTray; |'Z+`HI
BOOL bRegistered; qv^P
BOOL RegisterHotkey(); nW)?cQ
I
UCHAR cKey; 4< +f|(fIA
UCHAR cMask; dGgltY
void DeleteIcon(); 8WE@ X)e
void AddIcon(); +T\<oj%}2
UINT nCount; ,wf:Fr
void SaveBmp(); G2<$to~{
CCaptureDlg(CWnd* pParent = NULL); // standard constructor qj9[mBkP"
// Dialog Data U&i#cF
//{{AFX_DATA(CCaptureDlg) Z`_x|cU?J
enum { IDD = IDD_CAPTURE_DIALOG }; Lk)I;;
CComboBox m_Key; tD*k
BOOL m_bControl; L;lu)|b"
BOOL m_bAlt; i?ZVVE=r
BOOL m_bShift; z3Yi$*q <
CString m_Path; D]o=I1O?
CString m_Number; 9wlp
AK
//}}AFX_DATA -T}r$A
// ClassWizard generated virtual function overrides 15@2h
//{{AFX_VIRTUAL(CCaptureDlg) r+8)<Xt+p
public: yAAV,?:o[
virtual BOOL PreTranslateMessage(MSG* pMsg); #+QJ5VI:
protected: uI$n7\G!
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support NN#k^[i1
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 4> uN H5
//}}AFX_VIRTUAL n}b{u@$
// Implementation ^k*%`iQ
protected: | }L=e.
HICON m_hIcon; L3w.<h
// Generated message map functions JH| D
//{{AFX_MSG(CCaptureDlg) tnAj3wc
virtual BOOL OnInitDialog(); i=L 86Ks
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); {yv_Ni*6!
afx_msg void OnPaint(); A_l\ij$Y
afx_msg HCURSOR OnQueryDragIcon(); ny{S&f
virtual void OnCancel(); )RN3Oz@H
afx_msg void OnAbout(); 0cSm^a
afx_msg void OnBrowse(); vh.-9eD
afx_msg void OnChange(); Zb=;\l*&
//}}AFX_MSG MJh.)kd$
DECLARE_MESSAGE_MAP() _CPj]m{
}; [O<F `u"a
#endif oP`:NCj\9
<THwl/a
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 6fo\z2
#include "stdafx.h" @ R[K8
#include "Capture.h" ~n8UN<
#include "CaptureDlg.h" #1%ahPhR+
#include <windowsx.h> RP$h;0EQG
#pragma comment(lib,"hook.lib") %%|p J%}Q>
#ifdef _DEBUG >yr;Y4y7K
#define new DEBUG_NEW :2H]DDg(
#undef THIS_FILE "b402"&
static char THIS_FILE[] = __FILE__; tmOy"mq67
#endif !KJA)znx;(
#define IDM_SHELL WM_USER+1 X&HYWH'@,
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -. o,bg
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Rz&`L8Bz
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Zr1"'+-
class CAboutDlg : public CDialog (u^8=#
{ r&Nh>6<&/
public: YO-B|f
CAboutDlg(); e,{k!BXU#'
// Dialog Data ysZ(*K
n(?
//{{AFX_DATA(CAboutDlg) '$Z@oCY#
enum { IDD = IDD_ABOUTBOX }; [ )
0JI6
//}}AFX_DATA |||m5(`S
// ClassWizard generated virtual function overrides VXiU5n^
//{{AFX_VIRTUAL(CAboutDlg) )sW!s3>S>
protected: pfu"vo(t_
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support OwEV$Q
//}}AFX_VIRTUAL %f'=9pit
// Implementation gxmo 1
protected: I{0cnq/
//{{AFX_MSG(CAboutDlg) !@])Ut@tN
//}}AFX_MSG 0ETT@/)]z
DECLARE_MESSAGE_MAP() w&f>VB~,1
}; CVvl &on
W4$aX5ow$
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) S !#5
{ 4i.&geXA.
//{{AFX_DATA_INIT(CAboutDlg) +L"F] _?
//}}AFX_DATA_INIT x&^Xgi?
} za}Kd^KeB
V)Oot|
void CAboutDlg::DoDataExchange(CDataExchange* pDX) V dvj*I
{ ]Tb?z&
CDialog::DoDataExchange(pDX); xI<B)6D;f
//{{AFX_DATA_MAP(CAboutDlg) &OZx!G^Z
//}}AFX_DATA_MAP :-#7j}
R&
} <{8x-zbR+
"=n%L +6%
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) nTc#I~\
//{{AFX_MSG_MAP(CAboutDlg) -~aG_Bp!($
// No message handlers Q|P
M6ta
//}}AFX_MSG_MAP `q\F C[W
END_MESSAGE_MAP() /k?l%AH
H{yBDxw
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) "!(@MfjT
: CDialog(CCaptureDlg::IDD, pParent) lz6CK
{ n|? sNM<J3
//{{AFX_DATA_INIT(CCaptureDlg) zRmVV}b
m_bControl = FALSE; H;NAS/OhS
m_bAlt = FALSE; ?]bx]Y;
m_bShift = FALSE; ZbVn"he
m_Path = _T("c:\\"); )X," NJG
m_Number = _T("0 picture captured."); "=K3sk
nCount=0; Ym"^Ds}
bRegistered=FALSE; I
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bTray=FALSE; Du
+_dr^4
//}}AFX_DATA_INIT "=+i~N#Sc
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 K|\0jd)N
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); n^$Q^[:Z
} 0[fBP\H"Wr
@`+\vmfD
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 'v^shGI%Ht
{ wLiPkW
CDialog::DoDataExchange(pDX); _.R]K$U
//{{AFX_DATA_MAP(CCaptureDlg) O-ENFA~E;v
DDX_Control(pDX, IDC_KEY, m_Key); Nt_sV7zzb
DDX_Check(pDX, IDC_CONTROL, m_bControl); !<=(/4o&P
DDX_Check(pDX, IDC_ALT, m_bAlt); 5 (!F Q
DDX_Check(pDX, IDC_SHIFT, m_bShift); 6T+y m9
DDX_Text(pDX, IDC_PATH, m_Path); 7[0Mr,^
DDX_Text(pDX, IDC_NUMBER, m_Number); =w;-4
//}}AFX_DATA_MAP -xLK/QAL
} l"
~
CAw;
L4T\mP7D7*
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) |A,.mOT
//{{AFX_MSG_MAP(CCaptureDlg) Jw}&[
ON_WM_SYSCOMMAND() fQ"Vx!
ON_WM_PAINT() nC
!NZ
ON_WM_QUERYDRAGICON() h8%QF'C
ON_BN_CLICKED(ID_ABOUT, OnAbout) !-n*]C
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) >);M\,1\I
ON_BN_CLICKED(ID_CHANGE, OnChange) sw}^@0ua=
//}}AFX_MSG_MAP rN7JJHV
END_MESSAGE_MAP() -K$ugDi
\v+c.
BOOL CCaptureDlg::OnInitDialog() )(yaX
{ *Q?8OwhJ
CDialog::OnInitDialog(); tS\Db'C7
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); A-.Wd7^~*
ASSERT(IDM_ABOUTBOX < 0xF000); Im-qGB0C
CMenu* pSysMenu = GetSystemMenu(FALSE); Z_dL@\#|
if (pSysMenu != NULL) THX% z
`
{ vol (%wB
CString strAboutMenu; },}g](!m
strAboutMenu.LoadString(IDS_ABOUTBOX); t~dK\>L
if (!strAboutMenu.IsEmpty()) x!W5'DO
{ /&G|.Cx
pSysMenu->AppendMenu(MF_SEPARATOR); ltU{P|7!E
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); P.Cn[64a+@
} 6C"zBJcGc
} yxT}hMa
SetIcon(m_hIcon, TRUE); // Set big icon R rH{Y0
SetIcon(m_hIcon, FALSE); // Set small icon rx;;|eb,
m_Key.SetCurSel(0); AqQ5L>:Gq
RegisterHotkey(); 9bRUN<
CMenu* pMenu=GetSystemMenu(FALSE); GutiqVP:B
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 6{udNv X
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 5+Tx01)
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); vg3iT}
return TRUE; // return TRUE unless you set the focus to a control hT_Q_1,
} nO'C2)bBSG
*' es(]W
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) q9VBK(,X
{ :/6aBM?
if ((nID & 0xFFF0) == IDM_ABOUTBOX) v8'XchJ
{ .}eM"Kv
CAboutDlg dlgAbout; |{-?OOKj
dlgAbout.DoModal(); ^x/D8M
} })kx#_o]'d
else MK!
@ND
{ C8qSoO4Z
CDialog::OnSysCommand(nID, lParam); MQcIH2
} uTz>I'f
} {*g{9`
{,6J*v"o
void CCaptureDlg::OnPaint() P_mP ^L
{ `-cw[@uD
if (IsIconic()) x[)]u8^A
{ 9An\uH)mL
CPaintDC dc(this); // device context for painting U6wy^!_X9
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ]Lg~I#/#
// Center icon in client rectangle )M Tf
int cxIcon = GetSystemMetrics(SM_CXICON); yP} |8x
int cyIcon = GetSystemMetrics(SM_CYICON); _
M B/p
CRect rect; kef%5B
GetClientRect(&rect); 0 |?N
int x = (rect.Width() - cxIcon + 1) / 2; 1^GRUbOU[
int y = (rect.Height() - cyIcon + 1) / 2; @q>#]8
// Draw the icon b KIL@AI
dc.DrawIcon(x, y, m_hIcon); %qE"A6j
} &;r'JIp
else wL]#]DiE
{ snu?+*6
CDialog::OnPaint(); ,afO\oe>MG
} @ZJ}lED3
} |=~mRqG
lfd-!(tXD
HCURSOR CCaptureDlg::OnQueryDragIcon() v$JW7CKA
{ v+trHdSBYE
return (HCURSOR) m_hIcon; t;PG
} 8'qlg|{!~
j"pyK@v2B
void CCaptureDlg::OnCancel() 5! +{JTXa
{ n)D
if(bTray) 3QVUWhJ
DeleteIcon();
+O8zVWr
CDialog::OnCancel(); u#y)+A2&!
} T*C
F5S
Z!fbc#L6
void CCaptureDlg::OnAbout() ypemp=+(r
{ -`z%<)!Y
CAboutDlg dlg; n_Y7*3/b-o
dlg.DoModal(); e0ni
} r4X\/
5.oY$tb(
void CCaptureDlg::OnBrowse() :J x%K
{ 1gt 7My
CString str; <s|.2~
BROWSEINFO bi; ci:|x =
char name[MAX_PATH]; |)0Ta9~
ZeroMemory(&bi,sizeof(BROWSEINFO)); (n2_HePE
bi.hwndOwner=GetSafeHwnd(); 3,*A VcQA
bi.pszDisplayName=name; vd$>nJ"
bi.lpszTitle="Select folder"; h#)\K|
qs
bi.ulFlags=BIF_RETURNONLYFSDIRS; B`3z(a92S
LPITEMIDLIST idl=SHBrowseForFolder(&bi); M0)0~#?.D
if(idl==NULL) c(b`eUOO
return; r~oUln<[
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); -ULgVGYKK
str.ReleaseBuffer(); ![vy{U.:`
m_Path=str; g3Hi5[-H
if(str.GetAt(str.GetLength()-1)!='\\') W >}T$a}\
m_Path+="\\"; g`.H)36
UpdateData(FALSE); ~ oq.y n/1
} hBaG*J{
{-]K!tWda
void CCaptureDlg::SaveBmp() ;p<BiC$b
{ iyUnxqP
CDC dc; ,+C?UW
dc.CreateDC("DISPLAY",NULL,NULL,NULL); w}(pc}^U
CBitmap bm; =,qY\@fq
int Width=GetSystemMetrics(SM_CXSCREEN); <pKOFN%m
int Height=GetSystemMetrics(SM_CYSCREEN); -'WR9M?fq
bm.CreateCompatibleBitmap(&dc,Width,Height); 'gD./|Z0
CDC tdc; QK #qW-49O
tdc.CreateCompatibleDC(&dc); 28+{
CBitmap*pOld=tdc.SelectObject(&bm); `fJ;4$4
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Ad3TD L?
tdc.SelectObject(pOld); $3ZQ|X[|+
BITMAP btm; ]]}iSw'
bm.GetBitmap(&btm); Iue=\qUK^
DWORD size=btm.bmWidthBytes*btm.bmHeight; 2,Z@<
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); K$:btWSm
BITMAPINFOHEADER bih; >){}nlQf
bih.biBitCount=btm.bmBitsPixel; M_cm,|FF
bih.biClrImportant=0; 4@mJEi{
bih.biClrUsed=0; Q.V@Sawe5
bih.biCompression=0; W>&*.3{v
bih.biHeight=btm.bmHeight; 8NE[L#k
bih.biPlanes=1;
H<g8u{
$
bih.biSize=sizeof(BITMAPINFOHEADER); |DVFi2
bih.biSizeImage=size; o"P )(;
bih.biWidth=btm.bmWidth; K)Z~ iBRM
bih.biXPelsPerMeter=0; At[SkG}b
bih.biYPelsPerMeter=0; 9o P
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); a%6=sqxE
static int filecount=0; X2,v'`U5&
CString name; Y-+Kf5_[
name.Format("pict%04d.bmp",filecount++); R{aqn0M
name=m_Path+name; >lek@euqw
BITMAPFILEHEADER bfh; I)r6*|mz
bfh.bfReserved1=bfh.bfReserved2=0; e85E+S%
bfh.bfType=((WORD)('M'<< 8)|'B'); MAX?,-x
bfh.bfSize=54+size; o~4kJW#
bfh.bfOffBits=54; JP
;SO
CFile bf; b{x/V 9&|
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ )/OIzbA3#
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); P+_1*lOG
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); "^
dMCS@
bf.WriteHuge(lpData,size); ^ AZv4H*~
bf.Close(); P-yVc2YH
nCount++; =dQF}-{!
} P9S)7&+DL
GlobalFreePtr(lpData); gd7!+6
if(nCount==1) ~qTChCXP
m_Number.Format("%d picture captured.",nCount); 4[%_Bnv#AJ
else LRS,bl3}/
m_Number.Format("%d pictures captured.",nCount); KRP6b:+4L
UpdateData(FALSE); P~x4h{~Gd
} Klu0m~X@
I?\P^f
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) v9f%IE4fX
{ XGYsTquSe
if(pMsg -> message == WM_KEYDOWN) m?4HVv
{ ggfCfn
if(pMsg -> wParam == VK_ESCAPE) c3<H272\
return TRUE; ExL7 ]3r
if(pMsg -> wParam == VK_RETURN) [IHG9Xg
return TRUE; >*+n`"6
} {`>pigo
return CDialog::PreTranslateMessage(pMsg); /%{CJ0Y
} 0dD.xuor
hX-^h2eV
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) rCA0c8
{ cmd7-2
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ FS!vnl8`
SaveBmp(); or7l}X
return FALSE; *8u<?~9F
} a%an={
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ PBL=P+
CMenu pop; ;uZeYY?
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); !<X/_+G\
CMenu*pMenu=pop.GetSubMenu(0); F<*zL:-Z
pMenu->SetDefaultItem(ID_EXITICON); /:,}hy+U
CPoint pt; !SLfAFcS
GetCursorPos(&pt); oIE3`\xS
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 9c0
if(id==ID_EXITICON) DD>n-8M@>
DeleteIcon(); .H&XPW
else if(id==ID_EXIT) sYk#XNH
OnCancel(); !9V;
8g
return FALSE; 4T){z^"
} AmCymT3P*e
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 2@N-#x'
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Dj0D.}`~
AddIcon(); oXVx9dZ
return res; i"4;{C{s
} s4=EyBI
=#{q#COK$
void CCaptureDlg::AddIcon() :#N]s
{ T/hz23nH
NOTIFYICONDATA data; E 429<LQI/
data.cbSize=sizeof(NOTIFYICONDATA); 3_{rXtT)'
CString tip; usi3z9P>n
tip.LoadString(IDS_ICONTIP); #nj;F'O](
data.hIcon=GetIcon(0); z\WyL ;
data.hWnd=GetSafeHwnd(); *d 4A3|
strcpy(data.szTip,tip); lgbq^d
data.uCallbackMessage=IDM_SHELL; srKEtd"
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; :/>Zky8,k
data.uID=98; {aU|BdATI
Shell_NotifyIcon(NIM_ADD,&data); {817Svp@
ShowWindow(SW_HIDE); wRX#^;O9?>
bTray=TRUE; 'Awd:Aed5
} DTd qwe6pi
<J}JYT
void CCaptureDlg::DeleteIcon() =66'33l2
{ n6c+Okj
NOTIFYICONDATA data; $KoGh_h
data.cbSize=sizeof(NOTIFYICONDATA); <?Z]h]C^o
data.hWnd=GetSafeHwnd(); eZg>]<L
data.uID=98; |h.@Xy
Shell_NotifyIcon(NIM_DELETE,&data); w,<n5dMv
ShowWindow(SW_SHOW); 7eFFKl
SetForegroundWindow(); ^=gN >xP
ShowWindow(SW_SHOWNORMAL); m1sV~"v;
bTray=FALSE; hw B9N
} sM9utR
!_iv~Q zv
void CCaptureDlg::OnChange() sWVapup?
{ &hM7y7
RegisterHotkey(); 9!dG Xq
} +z~bH!$2
z6Nz)$!_i
BOOL CCaptureDlg::RegisterHotkey() J)H*tzg
{ TCkMJs?
UpdateData(); Dh68=F0
UCHAR mask=0; J7kqyo"
UCHAR key=0; a3Xd~Qs
if(m_bControl) {?}^HW9{
mask|=4; 5'|W(yR}
if(m_bAlt) OgzKX>N`A
mask|=2; gA] 3h8%w
if(m_bShift) *(Z\"o!
mask|=1; GgtYO4,
key=Key_Table[m_Key.GetCurSel()]; Vf$$e)
if(bRegistered){ E>u U6#v
DeleteHotkey(GetSafeHwnd(),cKey,cMask); VMu?mqEa
bRegistered=FALSE; m mH
xPd
} +Ur75YPh
cMask=mask; X#fjIrn
cKey=key; {s:"mkR
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Bf3 QB]9
return bRegistered; @oD2_D2
} NjO_Y t
1q|iw
四、小结 !-JvVdM;(
M'pIAm1p
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。