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:
pR`.8MMc8 ;#`Z(A} 一、实现方法
Sh2q#7hf JS({au 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:
;Qk* h'}f dE/Vl/ : #pragma data_seg("shareddata")
"^22Y}VB HHOOK hHook =NULL; //钩子句柄
=!{}:An1$ UINT nHookCount =0; //挂接的程序数目
&>L\unS static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
>@h0@N static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
P)>WIQSr static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
rIW`(IG_ static int KeyCount =0;
Tk.MtIs)V} static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
RTLu]Bry #pragma data_seg()
3~s0ux[ r;upJbSX 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。
gTO% -uy}]s5Qu 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:
1PLKcU jqb,^T|j;m BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
OEdp:dW| cKey,UCHAR cMask)
JXUO?9 {
n9cWvy&f BOOL bAdded=FALSE;
7-W(gD!` for(int index=0;index<MAX_KEY;index++){
4sNM#]%| if(hCallWnd[index]==0){
OSfwA& hCallWnd[index]=hWnd;
la|#SS95 HotKey[index]=cKey;
PM%./ HotKeyMask[index]=cMask;
^h^j:!76j bAdded=TRUE;
sE>'~+1_O KeyCount++;
zs[t<`2 break;
``aoLQc` }
X903;&Cim }
xv4nYm9 return bAdded;
gj6"U{D }
Srol0D I //删除热键
O}IS{/^7 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
GbB&kE3KP {
"]zq<LmX BOOL bRemoved=FALSE;
*zz/U
(9D for(int index=0;index<MAX_KEY;index++){
r)U9u 0 if(hCallWnd[index]==hWnd){
nU`vj`K
if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
[}P|OCW hCallWnd[index]=NULL;
V+Cb.$@ HotKey[index]=0;
El"XF?OgpP HotKeyMask[index]=0;
tC|5;'m.2 bRemoved=TRUE;
"GZhr[AW KeyCount--;
Szwa2IdI. break;
qDcl;{L }
3bE^[V8/ }
2uiiTg> }
"* 'rzd return bRemoved;
W{Nhh3 }
s2w.V
O
RsTpjY*Xb 9;h1;9sC| DLL中的钩子函数如下:
<`6-J `. \% ^<Ll LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
E.6^~'/ {
Yng9_w9Y BOOL bProcessed=FALSE;
cC4*4bMm if(HC_ACTION==nCode)
D}b+#G(m[ {
BMFpkK9| if((lParam&0xc0000000)==0xc0000000){// 有键松开
{&K#~[) switch(wParam)
3z~zcQ^\ {
Vfc9+T+ case VK_MENU:
&?zJ|7rh@| MaskBits&=~ALTBIT;
F\Tlpp9 break;
$9Z8P_^.0( case VK_CONTROL:
~^Vt)/}Q MaskBits&=~CTRLBIT;
-*?a*q/#nQ break;
YW/YeID case VK_SHIFT:
hnE@+(d=qJ MaskBits&=~SHIFTBIT;
M=0I 3o}J break;
mjy%xzVr6^ default: //judge the key and send message
8a-[Q break;
W P.6ea7k }
&a48DCZ for(int index=0;index<MAX_KEY;index++){
LuQ=i`eXx if(hCallWnd[index]==NULL)
.bnoK continue;
|? r,W~9` if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
V3I&0P k {
4fpz;2% SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
}.`ycLW' bProcessed=TRUE;
.F
3v) }
'lIT7MK }
b/O~f8t }
(Ptv#LSUX else if((lParam&0xc000ffff)==1){ //有键按下
chfj|Ce]x switch(wParam)
Oo=}j {
=b9?r case VK_MENU:
Cww$ A %} MaskBits|=ALTBIT;
ULQ*cW&;? break;
jQsucs5$h case VK_CONTROL:
C/
;f)k< MaskBits|=CTRLBIT;
,v)@&1Wh: break;
jOE b1 case VK_SHIFT:
KY4|C05, MaskBits|=SHIFTBIT;
vco:6Ab$ break;
YSv\T '3 default: //judge the key and send message
5:56l>0 break;
P9Rq'u }
/r}t for(int index=0;index<MAX_KEY;index++){
BnAia3z if(hCallWnd[index]==NULL)
gpE5ua& continue;
r=qb[4HiV if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
zy5@K) {
Isoqs(Oi SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
- +
$u bProcessed=TRUE;
rj<%_d'Z` }
0W]Wu[k }
cWh Aj>?_Q }
n;O
3.2 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
JLc\KVmF for(int index=0;index<MAX_KEY;index++){
|h6)p;`gc if(hCallWnd[index]==NULL)
C{Aeud #5 continue;
iFga==rw if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
yUNl)E SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
\ m2[ //lParam的意义可看MSDN中WM_KEYDOWN部分
6OIA>%{ }
/Q{Jf+>R> }
iM}cd$r{ }
/mqEc9sq, return CallNextHookEx( hHook, nCode, wParam, lParam );
-41L^Di\ }
51&wH rQ~%SUM7 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:
V3F2Z_VH2 0/-[k BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Sy8o/- BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
6,cyi|s Yxi.A$g 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
dd98vVj bpKb<c LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
_3kAN.g {
]+fL6"OD/2 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
o.y4&bC14; {
sA}=o.\j: //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
aD%")eP%& SaveBmp();
[.3M>,)+- return FALSE;
X*d,z~k%*d }
#gi&pR'$ …… //其它处理及默认处理
ZTHrjW1 }
7\5 [lM ?vM{9!M Eepy%-\ 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。
L(AY)gB Nu|?s- 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。
mezP"N=L~ `[Z?&'CRQ 二、编程步骤
]]9eUw= zXp{9P\c 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";
wK|&[ms d]w*fn 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
rS6iZp, .XYSO 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;
|p3]9H I,t 0X) 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;
oX!s u zBqr15 5、 添加代码,编译运行程序。
>Li
~Og@ +O9l@X$l= 三、程序代码
Z#^2F8,] H6e^"E ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
D~8f6Ko"m #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
=:9n+7~$
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
RI-whA8+ #if _MSC_VER > 1000
w;{k\=W3Ff #pragma once
a08B8 #endif // _MSC_VER > 1000
RC\TPG/8! #ifndef __AFXWIN_H__
*/?L_\7 #error include 'stdafx.h' before including this file for PCH
OJ]{FI #endif
)e]:T4*vo #include "resource.h" // main symbols
qdUlT*fw class CHookApp : public CWinApp
@{XN}tWDOp {
)M^;6S public:
j+Wgjf CHookApp();
| ql!@M(p // Overrides
`| R8WM // ClassWizard generated virtual function overrides
iY.~N#Q //{{AFX_VIRTUAL(CHookApp)
`4Nc(aUr public:
0~BQ8O=+mn virtual BOOL InitInstance();
9.PY49| virtual int ExitInstance();
H$\?D+xlf //}}AFX_VIRTUAL
qF( ]Ce //{{AFX_MSG(CHookApp)
uCmdNY // NOTE - the ClassWizard will add and remove member functions here.
2c9@n9Vx3a // DO NOT EDIT what you see in these blocks of generated code !
y$\K@B4 //}}AFX_MSG
Re,0RM\ DECLARE_MESSAGE_MAP()
2ZLK`^S };
zM[WbB+"m LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
}L:LcM BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
=oiY'}%(i BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
_H:SoJ' BOOL InitHotkey();
=fG(K!AQ BOOL UnInit();
~oSLWA9 #endif
@RT yCr xZ4\.K\f] //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
1mA)=hu #include "stdafx.h"
<2|x]b8 #include "hook.h"
VVCCPK^< #include <windowsx.h>
Bg7?1m #ifdef _DEBUG
R Af+%h* #define new DEBUG_NEW
z XVQLz5 #undef THIS_FILE
a$;+-Y static char THIS_FILE[] = __FILE__;
f
( UcJx #endif
Z<ke!H #define MAX_KEY 100
/Tv<
l #define CTRLBIT 0x04
z[OW%(vrm #define ALTBIT 0x02
Z AZQFr'* #define SHIFTBIT 0x01
!K`;fp! #pragma data_seg("shareddata")
)t)tk=R9N HHOOK hHook =NULL;
}yB@? UINT nHookCount =0;
Td8'z' static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
wiwJD}3h' static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
W,w g@2 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
= ng\ static int KeyCount =0;
TD\QX2m static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
hkW"D<ii- #pragma data_seg()
<NS=<'U HINSTANCE hins;
)xTp7YnZ; void VerifyWindow();
:Z1_;`>CT BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
FVF:1DT //{{AFX_MSG_MAP(CHookApp)
17};I7 // NOTE - the ClassWizard will add and remove mapping macros here.
I`5MAvP // DO NOT EDIT what you see in these blocks of generated code!
K8e >sU. //}}AFX_MSG_MAP
_$Z46wHmB END_MESSAGE_MAP()
p4aM`PW8>= .l#Pmd! CHookApp::CHookApp()
M~
*E! {
5HOhk"
// TODO: add construction code here,
Zsf<)Vx // Place all significant initialization in InitInstance
U/jJ@8 }
ym ,S/Uz [~jhOv^ CHookApp theApp;
@^;\(If2 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
?]paAP;4 {
1u&P,&T BOOL bProcessed=FALSE;
eZg31. if(HC_ACTION==nCode)
z|pH>R?: {
@&h<jM{D if((lParam&0xc0000000)==0xc0000000){// Key up
oD"fRBS+$ switch(wParam)
EE%OD~u&9# {
?w<x_Lo case VK_MENU:
b<:s{f"t, MaskBits&=~ALTBIT;
^P{'l^CVX break;
,QKG$F case VK_CONTROL:
B /Dj2 MaskBits&=~CTRLBIT;
;gW~+hW ^ break;
-R&h?ec case VK_SHIFT:
L;BYPZR MaskBits&=~SHIFTBIT;
RA\H?1;8C break;
1noFXzeU3 default: //judge the key and send message
*w@>zkBl break;
mZq*o<kTA }
*>\RGL;]8 for(int index=0;index<MAX_KEY;index++){
0Fi7| if(hCallWnd[index]==NULL)
=}Cb?C[; continue;
2\s-4H|
q if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
{J99F {
Gjv'$O2_ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
]%mg(&p4 bProcessed=TRUE;
x,p|n }
H;$w^Tr }
Z2
t0l% }
jl7e6#zu else if((lParam&0xc000ffff)==1){ //Key down
Sfvi|kZX switch(wParam)
@j^qT-0M {
gu"Agct4 case VK_MENU:
-iJ[9O
MaskBits|=ALTBIT;
67n1s break;
_xmM~q[c7p case VK_CONTROL:
&"L3U MaskBits|=CTRLBIT;
ZZeqOu7^ break;
sAnH\AFm case VK_SHIFT:
1F$a
My? MaskBits|=SHIFTBIT;
n
P 69W break;
z?yADYr9 default: //judge the key and send message
g8vN^nQf[ break;
YJ:CqTy }
\kg2pF[V for(int index=0;index<MAX_KEY;index++)
@AyC0} {
o>W}1_ if(hCallWnd[index]==NULL)
2&=;$2?} continue;
31bKgU{ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
y2<g96 {
=e ;\I/ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
ls/:/x(5d bProcessed=TRUE;
lSbAZ6 }
[F6=JZ }
p?dMa_g }
DVCc^5# if(!bProcessed){
S :oZ& for(int index=0;index<MAX_KEY;index++){
a?D\H5TF- if(hCallWnd[index]==NULL)
[bv.` continue;
O'!k$iJNb if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
S'?XI@t[ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
MiRMjQ2 }
Oz n7C?\* }
os#j;C]l }
`;i|
%$TU return CallNextHookEx( hHook, nCode, wParam, lParam );
(M[Kh ^ }
) d\Se9! N5~g:([k BOOL InitHotkey()
qk:F6kL\` {
h`5au<h< if(hHook!=NULL){
> m5j.GP; nHookCount++;
Gz6FwU8L return TRUE;
i:W
oT4 }
Ar>Om!]=v else
Q&n|tQ*4 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
wV U(Du if(hHook!=NULL)
VQLo
vt" nHookCount++;
W]rXt,{& return (hHook!=NULL);
xu_Tocvop }
o_={xrmIA BOOL UnInit()
hbN*_[ {
# Dy;x\a if(nHookCount>1){
"\>
<UJ nHookCount--;
m;[z)-&" return TRUE;
lW7kBCsz# }
F,4Q BOOL unhooked = UnhookWindowsHookEx(hHook);
#%+IU if(unhooked==TRUE){
&_!BMzp4 nHookCount=0;
{!E<hQ2<$9 hHook=NULL;
dJCu`34Y'| }
W+1V&a}E return unhooked;
YBg\L$|n }
t6js@Ih '!En,*'IS BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
!fz`O>-mZ {
;'cv?3Y BOOL bAdded=FALSE;
} #%sI"9 for(int index=0;index<MAX_KEY;index++){
ym1TGeFAq if(hCallWnd[index]==0){
6G1Z"9<2* hCallWnd[index]=hWnd;
@*_#zU#g HotKey[index]=cKey;
2]Y (<PC HotKeyMask[index]=cMask;
!%5{jO1 bAdded=TRUE;
<!=TxV>}A KeyCount++;
B#q5Ut break;
HlV3rYh }
Fbk<qQH }
+n)(\k{ return bAdded;
hWDgMmo7 }
)\^%w9h H&%=>hyX BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
d(fgv {
6x -PGq BOOL bRemoved=FALSE;
)?4m} for(int index=0;index<MAX_KEY;index++){
Z$[A.gD4 if(hCallWnd[index]==hWnd){
K$(U>D| if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
u5idH),< hCallWnd[index]=NULL;
SHwl^qVk[ HotKey[index]=0;
#|$7. e HotKeyMask[index]=0;
RRq*CLj
bRemoved=TRUE;
P,wFib^1 KeyCount--;
+mxs jcq0 break;
A"9aEOX-?i }
c&R . }
w.0.||C
O }
-j<UhW return bRemoved;
\HH|{ }
4.VEE~sH$ zpa'G1v void VerifyWindow()
>EMCG.** {
8zpK;+ for(int i=0;i<MAX_KEY;i++){
/CZOO)n if(hCallWnd
!=NULL){ *|` ' L
if(!IsWindow(hCallWnd)){ <F!:dyl
hCallWnd=NULL; s&fU|Jk8
HotKey=0; c%B=TAs5c
HotKeyMask=0; [s7I.rdGzz
KeyCount--; Rl S=^}>
} NS&~n^*k<
} M{(Y|3W
} OB"QWdh
} }!.7QpA$
Kfj*#)SZ
BOOL CHookApp::InitInstance() 2_Pe/
{ #}jf TM
AFX_MANAGE_STATE(AfxGetStaticModuleState()); .{8lG^0U<
hins=AfxGetInstanceHandle(); )}6:Ke)
InitHotkey(); Pb~S{):
return CWinApp::InitInstance(); [ PQG]"
} s5z@`M5'm
b,K1EEJ
int CHookApp::ExitInstance() pkM32v-
{ 9ge$)q@3
VerifyWindow(); {+`ep\.$&
UnInit(); ||_F
/AD
return CWinApp::ExitInstance(); ]_-$
} $MsM$]~
6zNN 8
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ?9PNCd3$d
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) w'qV~rN~tc
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ w$t2Hd
#if _MSC_VER > 1000 D@Wm-
#pragma once JHMj4Zkp
#endif // _MSC_VER > 1000 ^\wosB3E
@yek6E&9
class CCaptureDlg : public CDialog ___+5r21\
{ ^.<IT"
// Construction Q2#)Jx\6!
public: ,Qh4=+jwqn
BOOL bTray; o= 8yp2vG
BOOL bRegistered; F'h[g.\}
BOOL RegisterHotkey();
N.2rF
UCHAR cKey; CP?\'a"Kt
UCHAR cMask; Lv5AtZl}
void DeleteIcon(); x,1&ml5
void AddIcon(); =lffr?#&B
UINT nCount; Rn TPU`
void SaveBmp(); #:{u1sq;
CCaptureDlg(CWnd* pParent = NULL); // standard constructor "%Rx;xw|
// Dialog Data $MR{3-
//{{AFX_DATA(CCaptureDlg) #G\)ZheG
enum { IDD = IDD_CAPTURE_DIALOG }; fj"S|]e
CComboBox m_Key; z#-&M J
BOOL m_bControl; *.K}`89T
BOOL m_bAlt; +6TKk~0e^
BOOL m_bShift; >uUbWKn3
CString m_Path; M$?~C~b!*
CString m_Number; LAvAjvRc
//}}AFX_DATA (*M(gM{;
// ClassWizard generated virtual function overrides 7%F9.h
//{{AFX_VIRTUAL(CCaptureDlg) M`5^v0,C
public: 8T2$0
virtual BOOL PreTranslateMessage(MSG* pMsg); jy1*E3vQ
protected: %iX+"
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support mM95BUB
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); LOOv8'%O8
//}}AFX_VIRTUAL g,q&A$Wi
// Implementation 5&VLq
protected: KQ 2]VN"?_
HICON m_hIcon; PmTA3aH
// Generated message map functions 0ogTQ`2Z:
//{{AFX_MSG(CCaptureDlg) ~+|p.(I
virtual BOOL OnInitDialog(); x JepDCUJ>
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); $A-b-`X
afx_msg void OnPaint(); Dui<$jl0b
afx_msg HCURSOR OnQueryDragIcon(); 3c
^_IuW-
virtual void OnCancel(); {Ji[d.cY
afx_msg void OnAbout(); `zTVup&
afx_msg void OnBrowse(); _@HMk"A
afx_msg void OnChange(); K!'9wt
//}}AFX_MSG 6T)D6;@L
DECLARE_MESSAGE_MAP() _El=M0
}; x0 j$]$
#endif N7[i443a
Dn9Ta}miTO
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file iHR?]]RF
#include "stdafx.h" M~^|dR)D
#include "Capture.h" iJ#sg+
#include "CaptureDlg.h" /y1,w JI
#include <windowsx.h> 5Rc
5/ m
#pragma comment(lib,"hook.lib") uWgY+T
#ifdef _DEBUG "&>$/b$
#define new DEBUG_NEW (m@({
#undef THIS_FILE OI1&Z4Lx
static char THIS_FILE[] = __FILE__; eH75:`
#endif obY5taOw
#define IDM_SHELL WM_USER+1 ,%D \
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); yht_*7.lM
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ``0knr <
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; nIdvff
class CAboutDlg : public CDialog %e=BC^VW
{ Ey 4GyAl
public: F4KXx^~o
CAboutDlg(); m+,a=sR
// Dialog Data !,|yrB&`S
//{{AFX_DATA(CAboutDlg) PT|t6V"wd
enum { IDD = IDD_ABOUTBOX }; YJF!_kg.
//}}AFX_DATA U^:+J-z{
// ClassWizard generated virtual function overrides ]B\H
//{{AFX_VIRTUAL(CAboutDlg) O57
eq.aT
protected: 1Hk`i%
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support /+iU1m'(
//}}AFX_VIRTUAL &*A7{76x
// Implementation ]qvrpI!E!
protected: vm
1vX;
//{{AFX_MSG(CAboutDlg) SW#
5px`
//}}AFX_MSG E2+O-;VN
DECLARE_MESSAGE_MAP() 'z>|N{-xG
}; w+z~Mz}Vz
r3{Cu z
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) DTH;d-Z
{ p0>W}+8fF
//{{AFX_DATA_INIT(CAboutDlg) =0
mf
//}}AFX_DATA_INIT fH}#.vy
} ,l1A]Wx
{ZrIA+eH
void CAboutDlg::DoDataExchange(CDataExchange* pDX) XE6sFU
{ !EB<e5}8wK
CDialog::DoDataExchange(pDX); F^fL
//{{AFX_DATA_MAP(CAboutDlg) *QH@c3vUe\
//}}AFX_DATA_MAP $~W=)f9
} Nb(c;|nV
`O/1aW1
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) *6IytWOX5
//{{AFX_MSG_MAP(CAboutDlg) IT!u4iH[
// No message handlers Utd`T+AF*
//}}AFX_MSG_MAP avxr|uk
END_MESSAGE_MAP()
td@I ;d2
' d' Dlg
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) (_1(<Jw
: CDialog(CCaptureDlg::IDD, pParent) (#KSwWo{ed
{ gc,%A'OR^<
//{{AFX_DATA_INIT(CCaptureDlg) J[ ;g
\
m_bControl = FALSE; 8~*
|muN.e
m_bAlt = FALSE; -]n\|U<
m_bShift = FALSE; K@U[x,Sx
m_Path = _T("c:\\"); GO4IAUA
m_Number = _T("0 picture captured."); eO%w
i.Q
nCount=0; %JoHc?
bRegistered=FALSE; 5NGQWg
bTray=FALSE; 5y^I~"_i
//}}AFX_DATA_INIT e\)r"!?H`
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 9 n0?0mk
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); W2>VgMR [
} l;7T.2J'Z
E>_N|j)9
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) uSQlE=
{ 12]rfd
CDialog::DoDataExchange(pDX); ly9tI-E
//{{AFX_DATA_MAP(CCaptureDlg) /qaWUUf
DDX_Control(pDX, IDC_KEY, m_Key); +,c]FAx4
DDX_Check(pDX, IDC_CONTROL, m_bControl); _|jEuif
DDX_Check(pDX, IDC_ALT, m_bAlt); 5FMe &
DDX_Check(pDX, IDC_SHIFT, m_bShift); ^tFlA)
DDX_Text(pDX, IDC_PATH, m_Path); h[ cqa
DDX_Text(pDX, IDC_NUMBER, m_Number); GAP,$xAaW
//}}AFX_DATA_MAP .~O-
<P#
} mswAao<y&x
dD351!-
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) !-HJ%(5:F
//{{AFX_MSG_MAP(CCaptureDlg) ls({{34NF
ON_WM_SYSCOMMAND() :P8X?C63W]
ON_WM_PAINT() X<sM4dwxE
ON_WM_QUERYDRAGICON() Yr)<1.K4,M
ON_BN_CLICKED(ID_ABOUT, OnAbout) 2`^M OGYk
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) V7<w9MM
ON_BN_CLICKED(ID_CHANGE, OnChange) )tm%0z7R
//}}AFX_MSG_MAP JA09 o(
END_MESSAGE_MAP() S'(IG m4
laRn![[
BOOL CCaptureDlg::OnInitDialog() A'aY H`j
{ Hkrh d
CDialog::OnInitDialog(); De
([fC
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); LGh#
ASSERT(IDM_ABOUTBOX < 0xF000); C1==a FD
CMenu* pSysMenu = GetSystemMenu(FALSE); Df@b;-E
if (pSysMenu != NULL) 7q&T2?GEN
{ ,`!>.E.
CString strAboutMenu; /H*[~b
strAboutMenu.LoadString(IDS_ABOUTBOX); {nMCU{*k
if (!strAboutMenu.IsEmpty()) LJSx~)@
{ c?*x2Vk
pSysMenu->AppendMenu(MF_SEPARATOR); ,(B/R8ZF~
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); #y8Esik
} =5O&4G`}
} NC3XJ
4
SetIcon(m_hIcon, TRUE); // Set big icon -amNz.`[PR
SetIcon(m_hIcon, FALSE); // Set small icon &,QBJx<#
m_Key.SetCurSel(0); z
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RegisterHotkey(); 7O~hA*Z
CMenu* pMenu=GetSystemMenu(FALSE); =)%~QK{Y
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); J u"/#@
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); :j[=
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); l'1_Fb
return TRUE; // return TRUE unless you set the focus to a control 3F9 dr@I.7
} 5 Nt9'"
UW Px|]RC
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ?NxaJ^
{ ]4Q~x
if ((nID & 0xFFF0) == IDM_ABOUTBOX) #iT3aou
{ _4LDzVjNRe
CAboutDlg dlgAbout; c3)6{
dlgAbout.DoModal(); @=?#nB&
}
8#|PJc
else "d*-k R
{ G)gPL]C0
CDialog::OnSysCommand(nID, lParam); ,IPryI
} ;m"R.Q9*
} Nkx W*w%}l
C}71SlN'M
void CCaptureDlg::OnPaint() A<-3u
{ rW2l+:@c
if (IsIconic()) iwfH~
{ 'kekJ.wJ;
CPaintDC dc(this); // device context for painting }q)dXFL=I#
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); +L
pMNnl6
// Center icon in client rectangle KS;Wr6]@(O
int cxIcon = GetSystemMetrics(SM_CXICON); 7Pr5`#x#
int cyIcon = GetSystemMetrics(SM_CYICON); N#^o,/
CRect rect; "9,+m$nj
GetClientRect(&rect); > M4QEv
int x = (rect.Width() - cxIcon + 1) / 2; @}tk/7-E
int y = (rect.Height() - cyIcon + 1) / 2; mam(h{f$
// Draw the icon )z7+%n TO
dc.DrawIcon(x, y, m_hIcon); 0*:4@go0}i
} Gx-tPW}
else #+;0=6+SM
{ }#E~XlX^
CDialog::OnPaint(); SA.,Q~_T7
} 7;NvR4P%
} tH9BC5+r}
vH vwH
HCURSOR CCaptureDlg::OnQueryDragIcon() FhMl+Ou
{ yQ+C}8r5
return (HCURSOR) m_hIcon; K[i|OZWu
} ysQ8==`38i
pAdSOR2
void CCaptureDlg::OnCancel() 1 =9 Kwd
{ \"mLLnK?
if(bTray) Z#062NL
"
DeleteIcon(); 0V?:5r<
CDialog::OnCancel(); }P"JP[#E\
} b+mh9q'5E
T\o!^|8
void CCaptureDlg::OnAbout() =j !Ruy1
{ xZ(VvINL'
CAboutDlg dlg; UP |#WegO
dlg.DoModal(); @|J+f5O
} OcGHMGdn
[)83X\CO
void CCaptureDlg::OnBrowse() U^{'"x+
{ 7=x]p
CString str; +BE_K_56
BROWSEINFO bi; 6z80Y*|eJ
char name[MAX_PATH]; QH_I<Y:n
ZeroMemory(&bi,sizeof(BROWSEINFO)); 6s|4'!
bi.hwndOwner=GetSafeHwnd(); B0}f,J\
bi.pszDisplayName=name; *$o{+YP
bi.lpszTitle="Select folder"; U m9]X@z
bi.ulFlags=BIF_RETURNONLYFSDIRS; 5KFd/9
LPITEMIDLIST idl=SHBrowseForFolder(&bi); |lhVk\X
if(idl==NULL) G'
'l,\3
return; _o-D},f*e
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Wg2Y`2@t
str.ReleaseBuffer(); 0qrsf!
m_Path=str; -w:F8k ~
if(str.GetAt(str.GetLength()-1)!='\\') )R`w{V
m_Path+="\\"; S<V__Sv
UpdateData(FALSE); 2v6QUf
} Ge]2g0
) b
vZ~t+^
void CCaptureDlg::SaveBmp() +\a`:QET
{ UR&Uwa&.
CDC dc; A+lP]Oy0S
dc.CreateDC("DISPLAY",NULL,NULL,NULL); yprf
`D>
CBitmap bm; /Ma"a
^
int Width=GetSystemMetrics(SM_CXSCREEN); ,HFoy-Yq
int Height=GetSystemMetrics(SM_CYSCREEN); `2@t) :
bm.CreateCompatibleBitmap(&dc,Width,Height); t<6`?\Gk
CDC tdc; wcT0XXh
tdc.CreateCompatibleDC(&dc); :+SpZ>
CBitmap*pOld=tdc.SelectObject(&bm); `_6!nkq8
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 9
1r"-%(r
tdc.SelectObject(pOld); Ta38/v;S
BITMAP btm; ;@@1$mzK
bm.GetBitmap(&btm); bX:ARe
O
DWORD size=btm.bmWidthBytes*btm.bmHeight; >~5>)yN_a1
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 1YA_`_@w
BITMAPINFOHEADER bih; &Oq&ikw
bih.biBitCount=btm.bmBitsPixel; ~$N%UQn?b#
bih.biClrImportant=0; c D+IMlT
bih.biClrUsed=0; wyk4v}
bih.biCompression=0; %:/_O*~)Yg
bih.biHeight=btm.bmHeight; Syn>;FX
bih.biPlanes=1; l("Dw8H
bih.biSize=sizeof(BITMAPINFOHEADER); $e; _N4d^
bih.biSizeImage=size; (L?fYSP!
bih.biWidth=btm.bmWidth; /!kKL$j
bih.biXPelsPerMeter=0; )POuH*j
bih.biYPelsPerMeter=0;
oY:6a
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); +'H_sMmi{
static int filecount=0;
t]Xdzy
CString name; dlC)&Ai
name.Format("pict%04d.bmp",filecount++); ?L$
Dk5-W
name=m_Path+name; U3 e3
BITMAPFILEHEADER bfh; .N99=%[}h
bfh.bfReserved1=bfh.bfReserved2=0; Z@=1-l
bfh.bfType=((WORD)('M'<< 8)|'B'); Gw*n,*pz
bfh.bfSize=54+size; Da!A1|"
bfh.bfOffBits=54; d_&R>GmR$
CFile bf; :luVsQ
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 5Cd>p<
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); tm~V+t!mj
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); #J]u3*Tn|
bf.WriteHuge(lpData,size); 5B!l6ST
bf.Close(); }u&.n
pc
nCount++; udDhJ?
} wAxXK94#3
GlobalFreePtr(lpData); .N8AkQ(Ok
if(nCount==1) mxhO:.l
m_Number.Format("%d picture captured.",nCount); {Q[{H'Oa
else S*6P=O*
m_Number.Format("%d pictures captured.",nCount); b w!;ZRK
UpdateData(FALSE); RV5X0
} <8p53*a
8/*q#j
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) QF(.fq8, U
{ !CROc}
if(pMsg -> message == WM_KEYDOWN) 5YaTE<G
{ ]S4kWq{ Y
if(pMsg -> wParam == VK_ESCAPE) ~k?7XF I
return TRUE; C)`k{(-{
if(pMsg -> wParam == VK_RETURN) Fd-PjW/E8
return TRUE; F0%FX`b{{
} @.T
'>;izr
return CDialog::PreTranslateMessage(pMsg); z iR}
} \5 IB/*
^ElUU ?rX
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ;1&%Wj"d
{ D\ ]gIXg
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ [f}YXQ0N)
SaveBmp(); X>j% y7v
return FALSE; |GtTz&
} <Yu}7klJE
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ T>s~bIzL*e
CMenu pop; Ub*Gv(Pg
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); b[Sd$ACd
CMenu*pMenu=pop.GetSubMenu(0); BRbx.
pMenu->SetDefaultItem(ID_EXITICON); V #W,}+_Sz
CPoint pt; Lt0JUUa0
GetCursorPos(&pt); U7O~ch[,
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); DVt;I$
if(id==ID_EXITICON) XRCiv
DeleteIcon(); ZIQy}b'
else if(id==ID_EXIT) ^%V'l-}/
OnCancel(); 3JM0 m (
return FALSE; H=[eO
} I}Uj"m`>
LRESULT res= CDialog::WindowProc(message, wParam, lParam); %719h>$
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) x zu)``?
AddIcon(); 2apR7
return res; z[X>>P3<n
} Ahk6{uz
<QFT>#@T
void CCaptureDlg::AddIcon() Z
.VIb|
{ &^Q-:Kxs8
NOTIFYICONDATA data; 9`Bmop
data.cbSize=sizeof(NOTIFYICONDATA); OAO|HH
CString tip; , f{<
tip.LoadString(IDS_ICONTIP); 3:Q5dr+1_
data.hIcon=GetIcon(0); :UM>`Y
data.hWnd=GetSafeHwnd(); P*Va<'{:{
strcpy(data.szTip,tip); ]:jP*0bLx
data.uCallbackMessage=IDM_SHELL; ^N#B(F
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; |`[0U
data.uID=98; ?aOx
b
Shell_NotifyIcon(NIM_ADD,&data); =i[ _C>U
ShowWindow(SW_HIDE); K8M[xaI@
bTray=TRUE; TG9 a1q
} wb~BY
3y?I^ .B
void CCaptureDlg::DeleteIcon() OP0KK^#
{ l# u$w&
NOTIFYICONDATA data; DCr&%)Ll
data.cbSize=sizeof(NOTIFYICONDATA); @=JOAo
data.hWnd=GetSafeHwnd(); KBJ%$OQV
data.uID=98; MJ "ug8N
Shell_NotifyIcon(NIM_DELETE,&data); Ahl-EVIr<
ShowWindow(SW_SHOW); :}(Aq;}X
SetForegroundWindow(); T40&a(hXQ
ShowWindow(SW_SHOWNORMAL); ZLm?8g6-
bTray=FALSE; QS(aA*D
} !YX$4_I
iY@wg 8ry
void CCaptureDlg::OnChange() iQs^2z#Bd
{ #o`y<1rN
RegisterHotkey(); {jdtNtw
} Y$JGpeq8w
8i$quHd&x
BOOL CCaptureDlg::RegisterHotkey() b,C2(?hg
{ y,&'nk}
UpdateData(); o>4mkh[3
UCHAR mask=0; 7\(mn$
UCHAR key=0; K|^PHe
if(m_bControl) WXq=FZ-
mask|=4; {"kEu
if(m_bAlt) l$[7pM[
mask|=2; gR5
EK$
if(m_bShift) @6["A'h
mask|=1; =n@"lY u[
key=Key_Table[m_Key.GetCurSel()]; [d"]AF[#
if(bRegistered){ #BPJRNXd
DeleteHotkey(GetSafeHwnd(),cKey,cMask); #3VOC#.
bRegistered=FALSE; @FNaCmBX
} -d-vzri
cMask=mask; QK~44;LVIJ
cKey=key; Y5mQY5u|
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 2uSXC*Phz
return bRegistered; ujin+;1
} 3#\++h]QZ
D;1?IeS
四、小结 >b;o&E`\
z:Y
Z]
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。