如何使用Foundation将NSImage保存为PDF文件?这不是GUI应用程序,因此AppKit(以及NSView)未被使用。
编辑:好吧,我现在觉得很傻。 NSImage是AppKit的一部分,因此它正在使用中。但是,我的问题仍然存在:如何将NSImage保存为PDF?答案 0 :(得分:3)
通过建立与窗口服务器的连接,您可以使用NSImage
和NSView
。您可以使用AppKit函数NSApplicationLoad
建立与窗口服务器的连接。
<强>的main.m 强>
#include <AppKit/AppKit.h>
int main(int argc, const char **argv) {
if(argc != 3) {
fprintf(stderr, "Usage: %s source_img dest_pdf\n", argv[0]);
exit(1);
}
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
BOOL success;
NSString *imgPath, *pdfPath;
NSImage *myImage;
NSImageView *myView;
NSRect vFrame;
NSData *pdfData;
imgPath = [NSString stringWithUTF8String:argv[1]];
pdfPath = [NSString stringWithUTF8String:argv[2]];
/* Calling NSApplicationLoad will give a Carbon application a connection
to the window server and enable the use of NSImage, NSView, etc. */
success = NSApplicationLoad();
if(!success) {
fprintf(stderr, "Failed to make a connection to the window server\n");
exit(1);
}
/* Create image */
myImage = [[NSImage alloc] initWithContentsOfFile:imgPath];
if(!myImage) {
fprintf(stderr, "Failed to create image from path %s\n", argv[1]);
exit(1);
}
/* Create view with that size */
vFrame = NSZeroRect;
vFrame.size = [myImage size];
myView = [[NSImageView alloc] initWithFrame:vFrame];
[myView setImage:myImage];
[myImage release];
/* Generate data */
pdfData = [myView dataWithPDFInsideRect:vFrame];
[pdfData retain];
[myView release];
/* Write data to file */
success = [pdfData writeToFile:pdfPath options:0 error:NULL];
[pdfData release];
if(!success) {
fprintf(stderr, "Failed to write PDF data to path %s\n", argv[2]);
exit(1);
}
[pool release];
return 0;
}
使用框架Foundation和AppKit链接编译:
gcc -framework Foundation -framework AppKit main.m
编译时,您可以像这样使用它:
./a.out myImage.png outFile.pdf